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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM 10-K/A

                Amendment No. 1 to Form 10-K filed March 31, 2005

                  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                   FOR THE FISCAL YEAR ENDED DECEMBER 31, 2004
                             COMMISSION NO. 0-22915

                             CARRIZO OIL & GAS, INC.
             (Exact name of registrant as specified in its charter)
        TEXAS                                      76-0415919
     (State or other                           (I.R.S. Employer
     jurisdiction of                          Identification No.)
      incorporation)
  1000 LOUISIANA STREET, SUITE 1500                     77002
            Houston, Texas                            (Zip code) 
   (Principal executive offices)                     

       Registrant's telephone number, including area code: (713) 328-1000

           Securities Registered Pursuant to Section 12(g) of the Act:
                          COMMON STOCK, $.01 PAR VALUE

     Indicate  by check mark  whether the  registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days.

                                 YES [X] NO [ ]

     Indicate by check mark if disclosure of delinquent  filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K.

                                       [ ]

     Indicate by check mark whether the registrant is an accelerated filer.

                                 YES [X] NO [ ]

     At June 30, 2004,  the aggregate  market value of the  registrant's  Common
Stock held by non-affiliates of the registrant was approximately  $159.4 million
based on the closing price of such stock on such date of $10.21.

     At January 31, 2005, the number of shares  outstanding of the  registrant's
Common Stock was 22,456,007.

                       DOCUMENTS INCORPORATED BY REFERENCE
     Portions of the definitive proxy statement for the Registrant's 2005 Annual
Meeting of Shareholders  are  incorporated by reference in Part III of this Form
10-K.  Such  definitive  proxy  statement  will be filed with the Securities and
Exchange  Commission  not later than 120 days  subsequent  to December 31, 2004.
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                               TABLE OF CONTENTS




                                                                                                        
                        PART I.........................................................................    3
                           Item 9A.  Controls and Procedures...........................................    3
                        PART IV........................................................................    7
                           Item 15. Exhibits and Financial Statement Schedules.........................    7
                        SIGNATURES.....................................................................   12



                                       2


                                EXPLANATORY NOTE

     This Amendment No. 1 (this  "Amendment")  to the Form 10-K of Carrizo Oil &
Gas, Inc.  ("Carrizo,"  the  "Company" or "We") for the year ended  December 31,
2004 (the "Form 10-K"),  which was originally  filed on March 31, 2005, is being
filed to include  "Management's Annual Report on Internal Control Over Financial
Reporting,"  required by Item 308(a) of Regulation  S-K, and the related "Report
of the Registered Public Accounting Firm," required by Item 308(b) of Regulation
S-K. We amended Item 9A,  "Controls and Procedures" to include these reports and
Item 15 to reflect the filing of the relevant  exhibits with this Amendment.  No
other sections were affected.  In filing this  Amendment,  we are relying on the
extension for filing of these items  provided in the Order of the SEC in Release
No. 34-50754.

     This  Amendment  does not  affect  the  original  financial  statements  or
footnotes as originally  filed. This amendment does not reflect events occurring
after the  original  filing of the Form 10-K and does not  modify or update  the
disclosures  therein in any way other than as required to reflect the amendments
as described above and set forth below.

PART I

ITEM 9A.  CONTROLS AND PROCEDURES
 
     (a) DISCLOSURE CONTROLS AND PROCEDURES. We maintain disclosure controls and
procedures that are designed to provide  reasonable  assurance that  information
required  to be  disclosed  by us in the  reports  that we file or submit to the
Securities and Exchange Commission under the Securities Exchange Act of 1934, as
amended (the "Exchange  Act"), is recorded,  processed,  summarized and reported
within the time periods specified by the Commission's  rules and forms, and that
information is accumulated and  communicated  to our  management,  including our
Chief  Executive  Officer and Chief Financial  Officer,  as appropriate to allow
timely decisions regarding required disclosure.
      
     In accordance with Exchange Act Rules 13a-15 and 15d-15,  we carried out an
evaluation,  under the  supervision  and with the  participation  of management,
including  our Chief  Executive  Officer  and Chief  Financial  Officer,  of the
effectiveness  of our  disclosure  controls and  procedures as of the end of the
period  covered by this report.  As described  below under  Management's  Annual
Report on Internal  Control over Financial  Reporting,  we identified a material
weakness in the Company's internal control over financial  reporting (as defined
in Exchange Act Rules  13a-15(f)  and  15d-15(f)).  As a result of this material
weakness, our Chief Executive Officer and Chief Financial Officer have concluded
that, as of the end of the period  covered by this Annual Report on Form 10-K/A,
the Company's disclosure controls and procedures were not effective. The Company
has outlined a number of initiatives,  as discussed below under paragraph (b) of
this Item 9A, that it believes will remediate this material weakness in 2005.
      
     The audit report of Pannell Kerr  Forster of Texas,  P.C.,  dated March 15,
2005, which was included in the Form 10-K,  expressed an unqualified  opinion on
our consolidated financial statements, and its assessment of Management's Annual
Report on Internal  Control over  Financial  Reporting is included  herein under
paragraph (d) of this Item 9A.

     (b)   MANAGEMENT'S   ANNUAL  REPORT  ON  INTERNAL  CONTROL  OVER  FINANCIAL
REPORTING. Management, including the Company's Chief Executive Officer and Chief
Financial  Officer,  has the  responsibility  for  establishing  and maintaining
adequate internal control over financial  reporting,  as defined in Exchange Act
Rule 13a-15(f).  Internal control over financial reporting is a process designed
by, or under the supervision of, the Company's principal executive and principal
financial officers,  or persons performing similar functions and effected by the
Company's  Board of  Directors,  management  and  other  personnel,  to  provide
reasonable  assurance  regarding the reliability of financial  reporting and the
preparation  of financial  statements for external  purposes in accordance  with
accounting  principles  generally  accepted  in the  United  States  of  America
("GAAP").  Because of its inherent limitations,  internal control over financial
reporting may not prevent or detect misstatements.  In addition,  projections of
any evaluation of  effectiveness  to future periods are subject to the risk that
controls may become  inadequate or insufficient  because of changes in operating
conditions, or that the degree of compliance with the policies or procedures may
deteriorate.

     A control  deficiency exists when the design or operation of a control does
not allow  management or employees,  in the ordinary course of performing  their
assigned  functions,  to prevent or detect  misstatements  on a timely basis.  A
significant  deficiency  is a control  deficiency,  or  combination  of  control
deficiencies,   that  adversely  affects  the  Company's  ability  to  initiate,
authorize,  record,  process,  or report  external  financial  data  reliably in
accordance  with GAAP,  such that there is a more than remote  likelihood that a
misstatement  of the Company's  annual or interim  financial  statements that is
more than inconsequential will not be prevented or detected. A material weakness
is a control deficiency, or combination of control deficiencies, that results in
more than a remote  likelihood  that a  material  misstatement  of the annual or
interim financial statements will not be prevented or detected.

                                       3


     Management  assessed  internal  control  over  financial  reporting  of the
Company and its  subsidiary as of December 31, 2004.  The  Company's  management
conducted its assessment in accordance  with the Internal  Control -- Integrated
Framework  issued by the Committee of Sponsoring  Organizations  of the Treadway
Commission ("COSO"):

CLOSING CYCLE

     Upon completion of the Company's Sarbanes-Oxley Compliance assessment,  the
Company  identified the following  control  deficiencies  present in its closing
cycle.

     o    The accounting system is a manually  intensive  system,  requiring the
          extensive  use of  spreadsheets  to  accumulate  data and  prepare the
          underlying support for  reconciliations,  account analysis and routine
          journal entries, all of which increases the review time and chance for
          error.

     o    The current vacancy on the accounting staff for a financial  reporting
          director,  partially  remedied by reliance upon independent  financial
          reporting  consultants  for review of  critical  accounting  areas and
          disclosures and material non-standard transactions.

     As described below,  when considered in the aggregate,  these  deficiencies
constituted  a  material  weakness  over  the  effectiveness  of  detection  and
monitoring   controls  over  the  financial   statement  close  process.   These
deficiencies ultimately affect the accuracy of our financial statement reporting
and  disclosures.  As a  result,  management  has  concluded  that our  internal
                   -------------------------------------------------------------
controls over  financial  reporting  were not effective as of December 31, 2004.
--------------------------------------------------------------------------------
The Company had previously noted conditions related to the sufficiency of review
applied  to the  financial  statement  closing  process in  connection  with the
finalization of its 2003 financial statements.

     The manual year-end closing  processes were performed  substantially by our
accounting and finance staff,  with some reliance on contract  professionals and
financial reporting consultants. The combination of our manual, review intensive
accounting  system and the  absence of a  financial  reporting  director  placed
greater burdens of detailed  reviews upon our middle and upper-level  accounting
professionals  which, in turn compromised the level of their qualitative  review
of the financial statements and disclosures in the time available.  These review
procedures are an important  component of our controls  surrounding  the closing
process.  As a  result,  we  believe  that  the  lack of a  financial  reporting
director,  the  greater  demands on the time of our  accounting  staff and their
overall  workload  resulted in inadequate  staffing,  supervision  and financial
reporting expertise in our accounting  department,  which constituted a material
weakness in our internal controls as of December 31, 2004.

     Accordingly,  in connection  with its audit of our 2004 financial  results,
Pannell Kerr Forster of Texas, P.C. ("PKF"),  our independent  registered public
accounting  firm,  detected a number of errors and/or  omissions,  none of which
were material,  individually  or in aggregate,  but were an indication  that the
aforementioned  material  weakness was present at December 31, 2004,  increasing
the likelihood to more than remote that a material misstatement of the Company's
annual or interim  financial  statements will not be prevented or detected.  The
most notable of these  errors  related to stock based  compensation  expense and
related  footnote  disclosures.  Correcting  adjustments  were  recorded  by the
Company prior to the finalization of its 2004 financial statements.  The Company
has  implemented  procedures to prevent these specific  errors from occurring in
the future.  However, the additional  initiatives (outline below), are needed to
remediate  the material  weakness in our internal  controls,  and thus lower the
risk level to remote of other potential material errors or omissions.
 
     While  there  can be no  assurance  in this  regard,  we  expect  that  the
following  initiatives  will  eliminate  this  material  weakness  in 2005:  (1)
increasing  the  level  of our  professional  accounting  staff,  including  the
successful placement of a financial reporting  professional  (recruiting efforts
were begun in the second half of 2004),  (2)  expanding  the use of  independent
reviews  by  outside  financial  reporting  experts  during  the  vacancy of our
financial  reporting  position,  and  (3)  completing  our  transition  to a new
fully-integrated  accounting  software system (data conversion began in 2004) to
automate processes and improve qualitative reviews.  Until these initiatives are
fully  implemented,  we will  continue to rely on manual  processes  and require
additional  commitment  of  resources  to the  closing  process to  produce  our
financial records and reports.  We have discussed this material weakness and our
remediation steps with our Audit Committee.

                                       4


     PKF has issued its own attestation report on management's assessment of the
effectiveness  of internal  control over financial  reporting as of December 31,
2004, which is filed herewith.

     (c) CHANGES IN INTERNAL  CONTROL OVER FINANCIAL  REPORTING.  There have not
been any changes in the  Company's  internal  control over  financial  reporting
during the fiscal quarter ended December 31, 2004 that have materially affected,
or are reasonably likely to materially  affect,  the Company's  internal control
over financial  reporting.  As described  above in paragraph (b) of this Item 9A
under Management's  Annual Report on Internal Control over Financial  Reporting,
the Company  identified a material  weakness in the Company's  internal  control
over  financial  reporting and has described a number of planned  changes to its
internal control over financial reporting during 2005 designed to remediate this
weakness.

     (d) REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM.

     Board of Directors and Shareholders
     Carrizo Oil & Gas, Inc.
     Houston, Texas
      
     We have  audited  management's  assessment,  included  in the  accompanying
Management's   Annual  Report  on  Internal  Control  Over  Financial  Reporting
appearing under Item 9A, that Carrizo Oil & Gas, Inc. did not maintain effective
internal  control over financial  reporting as of December 31, 2004,  because of
the effect of the material weakness identified in management's assessment, based
on criteria established in Internal Control--Integrated  Framework issued by the
Committee  of  Sponsoring  Organizations  of  the  Treadway  Commission  (COSO).
Management  is  responsible  for  maintaining  effective  internal  control over
financial  reporting  and for its  assessment of the  effectiveness  of internal
control over financial reporting. Our responsibility is to express an opinion on
management's  assessment  and an opinion on the  effectiveness  of the Company's
internal control over financial reporting based on our audit.
      
     We  conducted  our audit in  accordance  with the  standards  of the Public
Company Accounting Oversight Board (United States). Those standards require that
we plan and  perform  the audit to obtain  reasonable  assurance  about  whether
effective  internal  control over  financial  reporting  was  maintained  in all
material  respects.  Our audit included  obtaining an  understanding of internal
control over financial reporting,  evaluating management's  assessment,  testing
and evaluating the design and operating  effectiveness of internal control,  and
performing   such  other   procedures   as  we   considered   necessary  in  the
circumstances.  We believe that our audit  provides a  reasonable  basis for our
opinion.
      
     A company's internal control over financial reporting is a process designed
to provide reasonable assurance regarding the reliability of financial reporting
and the preparation of financial  statements for external purposes in accordance
with accounting principles generally accepted in the United States of America. A
company's internal control over financial  reporting includes those policies and
procedures  that (1) pertain to the  maintenance  of records that, in reasonable
detail,  accurately and fairly reflect the  transactions and dispositions of the
assets of the company;  (2) provide  reasonable  assurance that transactions are
recorded  as  necessary  to  permit  preparation  of  financial   statements  in
accordance with generally accepted accounting principles in the United States of
America,  and that receipts and  expenditures of the company are being made only
in accordance  with  authorizations  of management and directors of the company;
and (3) provide reasonable assurance regarding prevention or timely detection of
unauthorized acquisition, use, or disposition of the company's assets that could
have a material effect on the financial statements.
      
     Because  of its  inherent  limitations,  internal  control  over  financial
reporting  may not prevent or detect  misstatements.  Also,  projections  of any
evaluation  of  effectiveness  to future  periods  are  subject to the risk that
controls may become  inadequate  because of changes in  conditions,  or that the
degree of compliance with the policies or procedures may deteriorate.
      
     A material  weakness is a control  deficiency,  or  combination  of control
deficiencies,  that  results  in more than a remote  likelihood  that a material
misstatement of the annual or interim financial statements will not be prevented
or  detected.   A  material   weakness  has  been  identified  and  included  in
management's assessment of internal control over financial reporting. Management
has identified the following internal control  deficiencies that when considered
in  the  aggregate  constitute  a  material  weakness  in the  effectiveness  of
detection and monitoring controls over the financial statement close process:

     o    The accounting system is a manually  intensive  system,  requiring the
          extensive  use of  spreadsheets  to  accumulate  data and  prepare the
          underlying support for  reconciliations,  account analysis and routine
          journal entries, all of which increases the review time and chance for
          error.

                                       5


     o    The current vacancy on the accounting staff for a financial  reporting
          director,  partially  remedied by reliance upon independent  financial
          reporting  consultants  for review of  critical  accounting  areas and
          disclosures and material non-standard transactions.

     This  material  weakness   manifested  itself  through  several  accounting
adjustments to the  consolidated  financial  statements and  disclosures for the
year ended  December 31,  2004,  the most notable of which relate to stock based
compensation and related disclosures.

     These  accounting  adjustments  individually  and in the aggregate were not
deemed to be material to the consolidated  financial statements taken as a whole
but were an indication that the aforementioned  material weakness was present at
December 31, 2004, increasing the likelihood to more than remote that a material
misstatement of the Company's annual or interim financial statements will not be
prevented or detected.

     This material  weakness was considered in determining  the nature,  timing,
and extent of audit  tests  applied in our audit of the  consolidated  financial
statements  as of and for the year ended  December 31, 2004,  of the Company and
this  report does not affect our report  dated March 15, 2005 on such  financial
statements.
      
     In our opinion,  management's  assessment  that Carrizo Oil & Gas, Inc. did
not maintain effective internal control over financial  reporting as of December
31,  2004  is  fairly  stated,  in all  material  respects,  based  on  criteria
established in Internal  Control--Integrated  Framework issued by COSO. Also, in
our opinion,  because of the effect of the material weakness  described above on
the  achievement of the objectives of the control  criteria,  Carrizo Oil & Gas,
Inc. has not maintained  effective internal control over financial  reporting as
of   December   31,   2004,   based  on   criteria   established   in   Internal
Control--Integrated Framework issued by COSO.

     We do not express an opinion or any other form of assurance on management's
statement  referring to the effectiveness of the process instituted to remediate
the material weakness.

/s/ Pannell Kerr Forster of Texas, P.C.
---------------------------------------
    Pannell Kerr Forster of Texas, P.C.

Houston, Texas
May 2, 2005


The  information  contained  in  this  Annual  Report  on Form  10-K/A  includes
forward-looking  statements within the meaning of the Securities Act of 1933 and
the  Securities  Exchange Act of 1934.  These  statements  include,  among other
things,  statements regarding the Company's  initiatives designed to eliminate a
material weakness in the Company's internal control over financial  reporting by
increasing the level of the Company's  professional  accounting staff,  hiring a
financial  reporting  professional,  expanding the use of independent reviews of
outside  financial  reporting  experts and  implementing a new  fully-integrated
accounting  software system and the results of these initiatives.  Any statement
that  is  not  a  historical  fact  is  a   forward-looking   statement.   These
forward-looking  statements  are  subject to certain  risks,  uncertainties  and
assumptions  as disclosed  from time to time in the  Company's  filings with the
Securities  and  Exchange  Commission,  including  the  actual  results of these
initiatives,  availability  of a  qualified  workforce  to fill  our  accounting
positions,  completion  of the  implementation  of our new  accounting  software
system and the results of audits and assessments.  As a result of these factors,
actual  results may differ  materially  from those  indicated or implied by such
forward-looking statements.

                                       6


PART IV

ITEM 15.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(A)(1)   FINANCIAL STATEMENTS

     See  Index  to the  Consolidated  Financial  Statements  and  Supplementary
Information  immediately  following  the  signature  page  of the  Form  10-K as
originally filed.

(A)(2)   FINANCIAL STATEMENT SCHEDULES

     All  schedules  and other  statements  for which  provision  is made in the
applicable  regulations of the Commission have been omitted because they are not
required under the relevant instructions or are inapplicable.

(A)(3) EXHIBITS



EXHIBIT INDEX

   EXHIBIT
   NUMBER                                       DESCRIPTION
   -------    -------------------------------------------------------------------
                                                                                       
    +2.1      -- Combination Agreement by and among the Company, Carrizo Production,
                   Inc., Encinitas Partners Ltd., La Rosa Partners Ltd., Carrizo Partners
                   Ltd., Paul B. Loyd, Jr., Steven A. Webster, S.P. Johnson IV, Douglas
                   A.P. Hamilton and Frank A. Wojtek dated as of June 6, 1998
                   (Incorporated herein by reference to Exhibit 2.1 to the Company's
                   Registration Statement on Form S-1 (Registration No. 333-29187)).
    +3.1      -- Amended and Restated Articles of Incorporation of the Company 
                   (Incorporated herein by reference to Exhibit 3.1 to the Company's 
                   Annual Report on Form 10-K for the year ended December 31, 1998).
    +3.2      -- Amended and Restated Bylaws of the Company, as amended by Amendment
                   No. 1 (Incorporated herein by reference to Exhibit 3.2 to the 
                   Company's Registration Statement on Form 8-A (Registration No.
                   000-22915), Amendment No. 2 (Incorporated herein by reference to
                   Exhibit 3.2 to the Company's Current Report on Form 8-K dated December
                   15, 1999) and Amendment No. 3 (Incorporated herein by reference to
                   Exhibit 3.1 to the Company's Current Report on Form 8-K dated February
                   20, 2002).
    +10.1     -- Amendment No. 1 to the Letter Agreement Regarding Participation in the 
                   Company's 2001 Seismic and Acreage Program, dated June 1, 2001
                   (Incorporated herein by reference to Exhibit 4.2 to the Company's 
                    Quarterly Report on Form 10-Q for the quarter ended June 30, 2001).
    +10.2     -- Amended and Restated Incentive Plan of the Company effective as of 
                   February 17, 2000 (Incorporated herein by reference to Exhibit 10.3 to 
                   the Company's Quarterly Report on Form 10-Q for the quarter ended June 
                   30, 2000).
    +10.3     -- Amendment No. 1 to the Amended and Restated Incentive Plan of the 
                   Company (Incorporated herein by reference to Exhibit 10.1 to the
                   Company's Quarterly Report on Form 10-Q for the quarter ended June 30,
                   2002).
    +10.4     -- Amendment No. 2 to the Amended and Restated Incentive Plan of the
                   Company (Incorporated herein by reference to Exhibit 10.3 to the
                   Company's Annual Report on Form 10-K for the year ended December 31,
                   2002).
    +10.5     -- Amendment No. 3 to the Amended and Restated Incentive Plan of the 
                   Company (Incorporated herein by reference to Appendix A to the
                   Company's Proxy Statement dated April 21, 2003).
    +10.6     -- Amendment No. 4 to the Amended and Restated Incentive Plan of the 
                   Company (incorporated herein by reference to Appendix B to the


                                       7


                   Company's Proxy Statement dated April 26, 2004).
    +10.7     -- Employment Agreement between the Company and S.P. Johnson IV 
                   (Incorporated herein by reference to Exhibit 10.2 to the Company's
                   Registration Statement on Form S-1 (Registration No. 333-29187)).
    +10.8     -- Employment Agreement between the Company and Kendall A. Trahan
                   (Incorporated herein by reference to Exhibit 10.4 to the Company's
                   Registration Statement on Form S-1 (Registration No. 333-29187)).
    +10.9     -- Employment Agreement between the Company and J. Bradley Fisher 
                   (Incorporated herein by reference to Exhibit 10.8 to the Company's
                   Registration Statement on Form S-2 (Registration No. 333-111475)).
    +10.10    -- Employment Agreement between the Company and Paul F. Boling 
                   (Incorporated herein by reference to Exhibit 10.9 to the Company's
                   Registration Statement on Form S-2 (Registration No. 333-111475)).
    +10.11    -- Form of Indemnification Agreement between the Company and each of its 
                   directors and executive officers (Incorporated herein by reference to
                   Exhibit 10.6 to the Company's Annual Report on Form 10-K for the year 
                   ended December 31, 1998).
    +10.12    -- S Corporation Tax Allocation, Payment and Indemnification Agreement 
                   among the Company and Messrs. Loyd, Webster, Johnson, Hamilton and
                   Wojtek (Incorporated herein by reference to Exhibit 10.8 to the 
                   Company's Registration Statement on Form S-1 (Registration No.
                   333-29187)).
    +10.13    -- S Corporation Tax Allocation, Payment and Indemnification Agreement
                   among Carrizo Production, Inc. and Messrs. Loyd, Webster, Johnson, 
                   Hamilton and Wojtek (Incorporated herein by reference to Exhibit 10.9
                   to the Company's Registration Statement on Form S-1 (Registration No. 
                   333-29187)).
    +10.14    -- Form of Amendment to Executive Officer Employment Agreement. 
                   (Incorporated herein by reference to Exhibit 99.3 to the Company's
                   Current Report on Form 8-K dated January 8, 1998).
    +10.15    -- Securities Purchase Agreement dated December 15, 1999 among the 
                   Company, CB Capital Investors, L.P., Mellon Ventures, L.P., Paul B.
                   Loyd Jr., Douglas A. P. Hamilton and Steven A. Webster (Incorporated
                   herein by reference to Exhibit 99.1 to the Company's Current Report on
                   Form 8-K dated December 15, 1999).
    +10.16    -- First Amendment to Securities Purchase Agreement dated as of June 7,
                   2004 among Carrizo Oil & Gas, Inc., Steelhead Investments Ltd.,
                   Douglas A.P. Hamilton, Paul B. Loyd, Jr., Steven A. Webster and Mellon
                   Ventures, L.P. (incorporated herein by reference to Exhibit 99.1 to
                   the Company's Current Report on Form 8-K filed on June 10, 2004).
    +10.17    -- Form of Amended and Restated 9% Senior Subordinated Note due 2008 
                   (incorporated herein by reference to Exhibit 99.2 to the Company's
                   Current Report on Form 8-K filed on June 10, 2004).
    +10.18    -- Second Amendment to Securities Purchase Agreement dated as of October 
                   29, 2004 among Carrizo Oil & Gas, Inc. and the Investors named therein 
                   (incorporated herein by reference to Exhibit 10.7 to the Company's 
                   Current Report on Form 8-K filed on November 3, 2004).
    +10.19    -- Shareholders Agreement dated December 15, 1999 among the Company, 
                   CB Capital Investors, L.P., Mellon Ventures, L.P., Paul B. Loyd Jr.,
                   Douglas A. P. Hamilton, Steven A. Webster, S.P. Johnson IV, Frank A. 
                   Wojtek and DAPHAM Partnership, L.P. (Incorporated herein by reference
                   to Exhibit 99.2 to the Company's Current Report on Form 8-K dated 
                   December 15, 1999).
    +10.20    -- First Amendment to Shareholders Agreement dated as of December 15,
                   1999 by and among Carrizo Oil & Gas, Inc, J.P. Morgan Partners (23A
                   SBIC), LLC, Mellon Ventures, L.P., S.P. Johnson IV, Frank A. Wojtek,
                   Steven A. Webster, Douglas A.P. Hamilton, Paul B. Loyd, Jr. and DAPHAM
                   Partnership, L.P. dated April 21, 2004 (incorporated herein by
                   reference to Exhibit 32 to the Schedule 13D/A filed by Paul B. Loyd,

                                       8


                   Jr. on May 27, 2004).
    +10.21    -- Second Amendment to Shareholders Agreement dated as of December 15,
                   1999 by and among Carrizo Oil & Gas, Inc., J.P. Morgan Partners (23A
                   SBIC), LLC, Mellon Ventures, L.P., S.P. Johnson IV, Frank A. Wojtek
                   and Steven A. Webster dated June 7, 2004 (incorporated herein by
                   reference to Exhibit 99.4 to the Company's Current Report on Form 8-K
                   filed on June 10, 2004).
    +10.22    -- Registration Rights Agreement dated December 15, 1999 among the 
                   Company, CB Capital Investors, L.P. and Mellon Ventures, L.P.
                   (Incorporated herein by reference to Exhibit 99.4 to the Company's 
                   Current Report on Form 8-K dated December 15, 1999).
    +10.23    -- Amended and Restated Registration Rights Agreement dated December 15, 
                   1999 among the Company, Paul B. Loyd Jr., Douglas A. P. Hamilton, 
                   Steven A. Webster, S.P. Johnson IV, Frank A. Wojtek and DAPHAM 
                   Partnership, L.P. (Incorporated herein by reference to Exhibit 99.5 to 
                   the Company's Current Report on Form 8-K dated December 15, 1999).
    +10.24    -- Form of Amendment to Executive Officer Employment Agreement 
                   (Incorporated herein by reference to Exhibit 99.7 to the Company's
                   Current Report on Form 8-K dated December 15, 1999).
    +10.25    -- Form of Amendment to Director Indemnification Agreement 
                   (Incorporated herein by reference to Exhibit 99.8 to the Company's 
                   Current Report on Form 8-K dated December 15, 1999).
    +10.26    -- Purchase and Sale Agreement by and between Rocky Mountain Gas, Inc. 
                   and CCBM, Inc., dated June 29, 2001 (Incorporated herein by reference
                   to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the 
                   quarter ended June 30, 2001).
    +10.27    -- Securities Purchase Agreement dated February 20, 2002 among the 
                   Company, Mellon Ventures, L.P. and Steven A. Webster (Incorporated 
                   herein by reference to Exhibit 99.1 to the Company's Current Report on 
                   Form 8-K dated February 20, 2002).
    +10.28    -- Warrant Agreement dated February 20, 2002 among the Company, Mellon 
                   Ventures, L.P. and Steven A. Webster (including Warrant Certificate) 
                   (Incorporated herein by reference to Exhibit 99.4 to the Company's 
                   Current Report on Form 8-K dated February 20, 2002).
    +10.29    -- Registration Rights Agreement dated February 20, 2002 among the 
                   Company, Mellon Ventures, L.P. and Steven A. Webster (Incorporated
                   herein by reference to Exhibit 99.5 to the Company's Current Report on 
                   Form 8-K dated February 20, 2002).
    +10.30    -- Form of Amendment to Executive Officer Employment Agreement 
                   (Incorporated herein by reference to Exhibit 99.7 to the Company's
                   Current Report on Form 8-K dated February 20, 2002).
    +10.31    -- Form of Amendment to Director Indemnification Agreement 
                   (Incorporated herein by reference to Exhibit 99.8 to
                   the Company's Current Report on Form 8-K dated February 20, 2002). 
    +10.32    -- Contribution and Subscription Agreement dated June 23, 2003 by and
                   among Pinnacle Gas Resources, Inc., CCBM, Inc., Rocky Mountain Gas, 
                   Inc. and the CSFB Parties listed therein (Incorporated herein by 
                   reference to Exhibit 10.1 to the Company's Quarterly Report on Form 
                   10-Q for the quarter ended June 30, 2003).
    +10.33    -- Transition Services Agreement dated June 23, 2003 by and between the 
                   Company and Pinnacle Gas Resources, Inc. (Incorporated herein by 
                   reference to Exhibit 10.2 to the Company's Quarterly Report on Form 
                   10-Q for the quarter ended June 30, 2003).
    +10.34    -- Second Amended and Restated Credit Agreement dated as of September 30, 
                   2004 by and among Carrizo Oil & Gas, Inc., CCBM, Inc., Hibernia
                   National Bank, as Agent, Union Bank of California, N.A., as co-agent, 
                   and Hibernia National Bank and Union Bank of California, N.A., as 
                   lenders (incorporated herein by reference to Exhibit 10.1 to the
                   Company's Current Report on Form 8-K filed on October 6, 2004).
    +10.35    -- First Amendment to Second Amended and Restated Credit Agreement dated 

                                       9


                   as of October 29, 2004 among Carrizo Oil & Gas, Inc., CCBM, Inc., 
                   Hibernia National Bank and Union Bank of California, N.A.
                   (incorporated herein by reference to Exhibit 10.6 to the Company's 
                   Current Report on Form 8-K filed on November 3, 2004).
    +10.36    -- Commercial Guaranty made and entered into as of September 30, 2004 by 
                   CCBM, Inc. in favor of Hibernia National Bank, as agent (incorporated
                   herein by reference to Exhibit 10.2 to the Company's Current Report on 
                   Form 8-K filed on October 6, 2004).
    +10.37    -- Amended and Restated Stock Pledge and Security Agreement dated and 
                   effective as of September 30, 2004 by Carrizo Oil & Gas, Inc. in favor
                   of Hibernia National Bank, as agent (incorporated herein by reference 
                   to Exhibit 10.3 to the Company's Current Report on Form 8-K filed on
                   October 6, 2004).
    +10.38    -- Note Purchase Agreement dated as of October 29, 2004 among Carrizo 
                   Oil & Gas, Inc., the Purchasers named therein and PCRL Investments
                   L.P., as collateral agent (incorporated herein by reference to Exhibit 
                   10.1 to the Company's Current Report on Form 8-K filed on November 3,
                   2004).
    +10.39    -- Form of 10% Senior Subordinated Secured Note due 2008 (incorporated
                   herein by reference to Exhibit 10.2 to the Company's Current Report on
                   Form 8-K filed on November 3, 2004).
    +10.40    -- Stock Pledge and Security Agreement dated as of October 29, 2004 by 
                   Carrizo Oil & Gas, Inc. in favor of PCRL Investments L.P., as
                   collateral agent (incorporated herein by reference to Exhibit 10.3 to 
                   the Company's Current Report on Form 8-K filed on November 3, 2004).
    +10.41    -- Commercial Guaranty dated as of October 29, 2004 by CCBM, Inc. in 
                   favor of PCRL Investments L.P., guarantying the indebtedness of 
                   Carrizo Oil & Gas, Inc. (incorporated herein by reference to Exhibit
                   10.4 to the Company's Current Report on Form 8-K filed on November 3,
                   2004).
    +10.42    -- Registration Rights Agreement dated as of October 29, 2004 among 
                   Carrizo Oil & Gas, Inc. and the Investors named therein (incorporated
                   herein by reference to Exhibit 10.5 to the Company's Current Report on 
                   Form 8-K filed on November 3, 2004).
    *10.43  -- Form of Stock Option Award Agreement.
    +10.44    -- Employment Agreement between the Company and Gregory E. Evans dated,
                   March 21, 2005 (incorporated herein by reference to Exhibit 10.1 to 
                   the Company's Current Report on Form 8-K filed on March 22, 2005).
    *10.45  -- Director Compensation.
    *10.46  -- Base Salaries and 2004 Annual Bonuses for certain Executive Officers.
    *21.1   -- Subsidiaries of the Company.
    *23.1   -- Consent of Pannell Kerr Forster of Texas, P.C.
    *23.2   -- Consent of Ernst & Young LLP.
    *23.3   -- Consent of Ryder Scott Company Petroleum Engineers.
    *23.4   -- Consent of Fairchild & Wells, Inc.
    *23.5   -- Consent of DeGolyer and MacNaughton.
    23.6    --  Consent of Pannell Kerr Forster of Texas, P.C.
    31.1   -- CEO Certification Pursuant to Section 302 of the Sarbanes-Oxley Act
                   of 2002.
    31.2   -- CFO Certification Pursuant to Section 302 of the Sarbanes-Oxley Act
                  of 2002.
    *32.1   -- CEO Certification Pursuant to Section 906 of the Sarbanes-Oxley Act
                   of 2002.
    *32.2   -- CFO Certification Pursuant to Section 906 of the Sarbanes-Oxley Act
                   of 2002.
    *99.1   -- Summary of Reserve Report of Ryder Scott Company Petroleum
                   Engineers as of December 31, 2004.
    *99.2   -- Summary of Reserve Report of Fairchild & Wells, Inc. as of December
                   31, 2004.
    *99.3       -- Summary of Reserve Report of DeGolyer and MacNaughton as of 

                                       10


                   December 31, 2004.

----------

+........Incorporated by reference as indicated.

*........Previously filed as an exhibit to the 10-K.



                                       11


                                   SIGNATURES

Pursuant to the  requirements of Section 13 or 15(d) of the Securities  Exchange
Act of 1934, the registrant has caused this report to be signed on its behalf by
the undersigned, thereunto duly authorized.

                                      CARRIZO OIL & GAS, INC.


                                      By: /s/ PAUL F. BOLING
                                          ------------------ 
                                      Name:  Paul F. Boling
                                      Title: Chief Financial Officer, Vice
                                             President, Secretary and 
                                             Treasurer

Date:  May 2, 2005


                                       12


                                  EXHIBIT INDEX



   EXHIBIT
   NUMBER                                       DESCRIPTION
   -------    -------------------------------------------------------------------
                                                                                       
    +2.1      -- Combination Agreement by and among the Company, Carrizo Production,
                   Inc., Encinitas Partners Ltd., La Rosa Partners Ltd., Carrizo Partners
                   Ltd., Paul B. Loyd, Jr., Steven A. Webster, S.P. Johnson IV, Douglas
                   A.P. Hamilton and Frank A. Wojtek dated as of June 6, 1998
                   (Incorporated herein by reference to Exhibit 2.1 to the Company's
                   Registration Statement on Form S-1 (Registration No. 333-29187)).
    +3.1      -- Amended and Restated Articles of Incorporation of the Company 
                   (Incorporated herein by reference to Exhibit 3.1 to the Company's 
                   Annual Report on Form 10-K for the year ended December 31, 1998).
    +3.2      -- Amended and Restated Bylaws of the Company, as amended by Amendment
                   No. 1 (Incorporated herein by reference to Exhibit 3.2 to the 
                   Company's Registration Statement on Form 8-A (Registration No.
                   000-22915), Amendment No. 2 (Incorporated herein by reference to
                   Exhibit 3.2 to the Company's Current Report on Form 8-K dated December
                   15, 1999) and Amendment No. 3 (Incorporated herein by reference to
                   Exhibit 3.1 to the Company's Current Report on Form 8-K dated February
                   20, 2002).
    +10.1     -- Amendment No. 1 to the Letter Agreement Regarding Participation in the 
                   Company's 2001 Seismic and Acreage Program, dated June 1, 2001
                   (Incorporated herein by reference to Exhibit 4.2 to the Company's 
                    Quarterly Report on Form 10-Q for the quarter ended June 30, 2001).
    +10.2     -- Amended and Restated Incentive Plan of the Company effective as of 
                   February 17, 2000 (Incorporated herein by reference to Exhibit 10.3 to 
                   the Company's Quarterly Report on Form 10-Q for the quarter ended June 
                   30, 2000).
    +10.3     -- Amendment No. 1 to the Amended and Restated Incentive Plan of the 
                   Company (Incorporated herein by reference to Exhibit 10.1 to the
                   Company's Quarterly Report on Form 10-Q for the quarter ended June 30,
                   2002).
    +10.4     -- Amendment No. 2 to the Amended and Restated Incentive Plan of the
                   Company (Incorporated herein by reference to Exhibit 10.3 to the
                   Company's Annual Report on Form 10-K for the year ended December 31,
                   2002).
    +10.5     -- Amendment No. 3 to the Amended and Restated Incentive Plan of the 
                   Company (Incorporated herein by reference to Appendix A to the
                   Company's Proxy Statement dated April 21, 2003).
    +10.6     -- Amendment No. 4 to the Amended and Restated Incentive Plan of the 
                   Company (incorporated herein by reference to Appendix B to the
                   Company's Proxy Statement dated April 26, 2004).
    +10.7     -- Employment Agreement between the Company and S.P. Johnson IV 
                   (Incorporated herein by reference to Exhibit 10.2 to the Company's
                   Registration Statement on Form S-1 (Registration No. 333-29187)).
    +10.8     -- Employment Agreement between the Company and Kendall A. Trahan
                   (Incorporated herein by reference to Exhibit 10.4 to the Company's
                   Registration Statement on Form S-1 (Registration No. 333-29187)).
    +10.9     -- Employment Agreement between the Company and J. Bradley Fisher 
                   (Incorporated herein by reference to Exhibit 10.8 to the Company's
                   Registration Statement on Form S-2 (Registration No. 333-111475)).
    +10.10    -- Employment Agreement between the Company and Paul F. Boling 
                   (Incorporated herein by reference to Exhibit 10.9 to the Company's
                   Registration Statement on Form S-2 (Registration No. 333-111475)).
    +10.11    -- Form of Indemnification Agreement between the Company and each of its 
                   directors and executive officers (Incorporated herein by reference to
                   Exhibit 10.6 to the Company's Annual Report on Form 10-K for the year 

                                       13


                   ended December 31, 1998).
    +10.12    -- S Corporation Tax Allocation, Payment and Indemnification Agreement 
                   among the Company and Messrs. Loyd, Webster, Johnson, Hamilton and
                   Wojtek (Incorporated herein by reference to Exhibit 10.8 to the 
                   Company's Registration Statement on Form S-1 (Registration No.
                   333-29187)).
    +10.13    -- S Corporation Tax Allocation, Payment and Indemnification Agreement
                   among Carrizo Production, Inc. and Messrs. Loyd, Webster, Johnson, 
                   Hamilton and Wojtek (Incorporated herein by reference to Exhibit 10.9
                   to the Company's Registration Statement on Form S-1 (Registration No. 
                   333-29187)).
    +10.14    -- Form of Amendment to Executive Officer Employment Agreement. 
                   (Incorporated herein by reference to Exhibit 99.3 to the Company's
                   Current Report on Form 8-K dated January 8, 1998).
    +10.15    -- Securities Purchase Agreement dated December 15, 1999 among the 
                   Company, CB Capital Investors, L.P., Mellon Ventures, L.P., Paul B.
                   Loyd Jr., Douglas A. P. Hamilton and Steven A. Webster (Incorporated
                   herein by reference to Exhibit 99.1 to the Company's Current Report on
                   Form 8-K dated December 15, 1999).
    +10.16    -- First Amendment to Securities Purchase Agreement dated as of June 7,
                   2004 among Carrizo Oil & Gas, Inc., Steelhead Investments Ltd.,
                   Douglas A.P. Hamilton, Paul B. Loyd, Jr., Steven A. Webster and Mellon
                   Ventures, L.P. (incorporated herein by reference to Exhibit 99.1 to
                   the Company's Current Report on Form 8-K filed on June 10, 2004).
    +10.17    -- Form of Amended and Restated 9% Senior Subordinated Note due 2008 
                   (incorporated herein by reference to Exhibit 99.2 to the Company's
                   Current Report on Form 8-K filed on June 10, 2004).
    +10.18    -- Second Amendment to Securities Purchase Agreement dated as of October 
                   29, 2004 among Carrizo Oil & Gas, Inc. and the Investors named therein 
                   (incorporated herein by reference to Exhibit 10.7 to the Company's 
                   Current Report on Form 8-K filed on November 3, 2004).
    +10.19    -- Shareholders Agreement dated December 15, 1999 among the Company, 
                   CB Capital Investors, L.P., Mellon Ventures, L.P., Paul B. Loyd Jr.,
                   Douglas A. P. Hamilton, Steven A. Webster, S.P. Johnson IV, Frank A. 
                   Wojtek and DAPHAM Partnership, L.P. (Incorporated herein by reference
                   to Exhibit 99.2 to the Company's Current Report on Form 8-K dated 
                   December 15, 1999).
    +10.20    -- First Amendment to Shareholders Agreement dated as of December 15,
                   1999 by and among Carrizo Oil & Gas, Inc, J.P. Morgan Partners (23A
                   SBIC), LLC, Mellon Ventures, L.P., S.P. Johnson IV, Frank A. Wojtek,
                   Steven A. Webster, Douglas A.P. Hamilton, Paul B. Loyd, Jr. and DAPHAM
                   Partnership, L.P. dated April 21, 2004 (incorporated herein by
                   reference to Exhibit 32 to the Schedule 13D/A filed by Paul B. Loyd,
                   Jr. on May 27, 2004).
    +10.21    -- Second Amendment to Shareholders Agreement dated as of December 15,
                   1999 by and among Carrizo Oil & Gas, Inc., J.P. Morgan Partners (23A
                   SBIC), LLC, Mellon Ventures, L.P., S.P. Johnson IV, Frank A. Wojtek
                   and Steven A. Webster dated June 7, 2004 (incorporated herein by
                   reference to Exhibit 99.4 to the Company's Current Report on Form 8-K
                   filed on June 10, 2004).
    +10.22    -- Registration Rights Agreement dated December 15, 1999 among the 
                   Company, CB Capital Investors, L.P. and Mellon Ventures, L.P.
                   (Incorporated herein by reference to Exhibit 99.4 to the Company's 
                   Current Report on Form 8-K dated December 15, 1999).
    +10.23    -- Amended and Restated Registration Rights Agreement dated December 15, 
                   1999 among the Company, Paul B. Loyd Jr., Douglas A. P. Hamilton, 
                   Steven A. Webster, S.P. Johnson IV, Frank A. Wojtek and DAPHAM 
                   Partnership, L.P. (Incorporated herein by reference to Exhibit 99.5 to 
                   the Company's Current Report on Form 8-K dated December 15, 1999).


                                       14


    +10.24    -- Form of Amendment to Executive Officer Employment Agreement 
                   (Incorporated herein by reference to Exhibit 99.7 to the Company's
                   Current Report on Form 8-K dated December 15, 1999).
    +10.25    -- Form of Amendment to Director Indemnification Agreement 
                   (Incorporated herein by reference to Exhibit 99.8 to the Company's 
                   Current Report on Form 8-K dated December 15, 1999).
    +10.26    -- Purchase and Sale Agreement by and between Rocky Mountain Gas, Inc. 
                   and CCBM, Inc., dated June 29, 2001 (Incorporated herein by reference
                   to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the 
                   quarter ended June 30, 2001).
    +10.27    -- Securities Purchase Agreement dated February 20, 2002 among the 
                   Company, Mellon Ventures, L.P. and Steven A. Webster (Incorporated 
                   herein by reference to Exhibit 99.1 to the Company's Current Report on 
                   Form 8-K dated February 20, 2002).
    +10.28    -- Warrant Agreement dated February 20, 2002 among the Company, Mellon 
                   Ventures, L.P. and Steven A. Webster (including Warrant Certificate) 
                   (Incorporated herein by reference to Exhibit 99.4 to the Company's 
                   Current Report on Form 8-K dated February 20, 2002).
    +10.29    -- Registration Rights Agreement dated February 20, 2002 among the 
                   Company, Mellon Ventures, L.P. and Steven A. Webster (Incorporated
                   herein by reference to Exhibit 99.5 to the Company's Current Report on 
                   Form 8-K dated February 20, 2002).
    +10.30    -- Form of Amendment to Executive Officer Employment Agreement 
                   (Incorporated herein by reference to Exhibit 99.7 to the Company's
                   Current Report on Form 8-K dated February 20, 2002).
    +10.31    -- Form of Amendment to Director Indemnification Agreement 
                   (Incorporated herein by reference to Exhibit 99.8 to
                   the Company's Current Report on Form 8-K dated February 20, 2002). 
    +10.32    -- Contribution and Subscription Agreement dated June 23, 2003 by and
                   among Pinnacle Gas Resources, Inc., CCBM, Inc., Rocky Mountain Gas, 
                   Inc. and the CSFB Parties listed therein (Incorporated herein by 
                   reference to Exhibit 10.1 to the Company's Quarterly Report on Form 
                   10-Q for the quarter ended June 30, 2003).
    +10.33    -- Transition Services Agreement dated June 23, 2003 by and between the 
                   Company and Pinnacle Gas Resources, Inc. (Incorporated herein by 
                   reference to Exhibit 10.2 to the Company's Quarterly Report on Form 
                   10-Q for the quarter ended June 30, 2003).
    +10.34    -- Second Amended and Restated Credit Agreement dated as of September 30, 
                   2004 by and among Carrizo Oil & Gas, Inc., CCBM, Inc., Hibernia
                   National Bank, as Agent, Union Bank of California, N.A., as co-agent, 
                   and Hibernia National Bank and Union Bank of California, N.A., as 
                   lenders (incorporated herein by reference to Exhibit 10.1 to the
                   Company's Current Report on Form 8-K filed on October 6, 2004).
    +10.35    -- First Amendment to Second Amended and Restated Credit Agreement dated 
                   as of October 29, 2004 among Carrizo Oil & Gas, Inc., CCBM, Inc., 
                   Hibernia National Bank and Union Bank of California, N.A.
                   (incorporated herein by reference to Exhibit 10.6 to the Company's 
                   Current Report on Form 8-K filed on November 3, 2004).
    +10.36    -- Commercial Guaranty made and entered into as of September 30, 2004 by 
                   CCBM, Inc. in favor of Hibernia National Bank, as agent (incorporated
                   herein by reference to Exhibit 10.2 to the Company's Current Report on 
                   Form 8-K filed on October 6, 2004).
    +10.37    -- Amended and Restated Stock Pledge and Security Agreement dated and 
                   effective as of September 30, 2004 by Carrizo Oil & Gas, Inc. in favor
                   of Hibernia National Bank, as agent (incorporated herein by reference 
                   to Exhibit 10.3 to the Company's Current Report on Form 8-K filed on
                   October 6, 2004).
    +10.38    -- Note Purchase Agreement dated as of October 29, 2004 among Carrizo 
                   Oil & Gas, Inc., the Purchasers named therein and PCRL Investments
                   L.P., as collateral agent (incorporated herein by reference to Exhibit 


                                       15


                   10.1 to the Company's Current Report on Form 8-K filed on November 3,
                   2004).
    +10.39    -- Form of 10% Senior Subordinated Secured Note due 2008 (incorporated
                   herein by reference to Exhibit 10.2 to the Company's Current Report on
                   Form 8-K filed on November 3, 2004).
    +10.40    -- Stock Pledge and Security Agreement dated as of October 29, 2004 by 
                   Carrizo Oil & Gas, Inc. in favor of PCRL Investments L.P., as
                   collateral agent (incorporated herein by reference to Exhibit 10.3 to 
                   the Company's Current Report on Form 8-K filed on November 3, 2004).
    +10.41    -- Commercial Guaranty dated as of October 29, 2004 by CCBM, Inc. in 
                   favor of PCRL Investments L.P., guarantying the indebtedness of 
                   Carrizo Oil & Gas, Inc. (incorporated herein by reference to Exhibit
                   10.4 to the Company's Current Report on Form 8-K filed on November 3,
                   2004).
    +10.42    -- Registration Rights Agreement dated as of October 29, 2004 among 
                   Carrizo Oil & Gas, Inc. and the Investors named therein (incorporated
                   herein by reference to Exhibit 10.5 to the Company's Current Report on 
                   Form 8-K filed on November 3, 2004).
    *10.43  -- Form of Stock Option Award Agreement.
    +10.44    -- Employment Agreement between the Company and Gregory E. Evans dated,
                   March 21, 2005 (incorporated herein by reference to Exhibit 10.1 to 
                   the Company's Current Report on Form 8-K filed on March 22, 2005).
    *10.45  -- Director Compensation.
    *10.46  -- Base Salaries and 2004 Annual Bonuses for certain Executive Officers.
    *21.1   -- Subsidiaries of the Company.
    *23.1   -- Consent of Pannell Kerr Forster of Texas, P.C.
    *23.2   -- Consent of Ernst & Young LLP.
    *23.3   -- Consent of Ryder Scott Company Petroleum Engineers.
    *23.4   -- Consent of Fairchild & Wells, Inc.
    *23.5   -- Consent of DeGolyer and MacNaughton.
    23.6    --  Consent of Pannell Kerr Forster of Texas, P.C.
    31.1   -- CEO Certification Pursuant to Section 302 of the Sarbanes-Oxley Act
                   of 2002.
    31.2   -- CFO Certification Pursuant to Section 302 of the Sarbanes-Oxley Act
                  of 2002.
    *32.1   -- CEO Certification Pursuant to Section 906 of the Sarbanes-Oxley Act
                   of 2002.
    *32.2   -- CFO Certification Pursuant to Section 906 of the Sarbanes-Oxley Act
                   of 2002.
    *99.1   -- Summary of Reserve Report of Ryder Scott Company Petroleum
                   Engineers as of December 31, 2004.
    *99.2   -- Summary of Reserve Report of Fairchild & Wells, Inc. as of December
                   31, 2004.
    *99.3       -- Summary of Reserve Report of DeGolyer and MacNaughton as of 
                   December 31, 2004.

----------

+........Incorporated by reference as indicated.

*........Previously filed as an exhibit to the 10-K.



                                       16