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

                                  SCHEDULE 13D
                        Under the Securities Act of 1934
                               (Amendment No. 11)

                            Mexican Restaurants, Inc.
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    14712P104
                                 (CUSIP Number)

                                David Nierenberg

                               The D3 Family Funds

                               19605 NE 8th Street

                                 Camas, WA 98607

                                  360-604-8600
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                September 2, 2005
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D and is filing this
schedule because of ss.ss.240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box: |_|



--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON

     The D3 Family Fund, L.P. (David Nierenberg is president of the General
     Partner, which is Nierenberg Investment Management Company.)
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                 (a)  |X| 
                                                                 (b)  |_| 
--------------------------------------------------------------------------------
3    SEC USE ONLY


--------------------------------------------------------------------------------
4    SOURCE OF FUNDS

     WC
--------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   |_| 


--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     USA
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER
                    
                    545,306 common shares (15.8%)
               -----------------------------------------------------------------
  NUMBER OF    8    SHARED VOTING POWER
   SHARES           
BENEFICIALLY        0
  OWNED BY     -----------------------------------------------------------------
    EACH       9    SOLE DISPOSITIVE POWER
  REPORTING         
   PERSON           545,306
    WITH       -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
                    
                    0
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     1,073,010 shares (31.1%)
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES   |_|


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     31.1%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON

     PN
--------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                       2


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON

     The D3 Family Retirement Fund, L.P. (David Nierenberg is president of the
     General Partner, which is Nierenberg Investment Management Company.)
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                 (a)  |X| 
                                                                 (b)  |_| 
--------------------------------------------------------------------------------
3    SEC USE ONLY


--------------------------------------------------------------------------------
4    SOURCE OF FUNDS

     WC
--------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   |_| 


--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     USA
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER
                    
                    222,770 common shares (6.5%)
               -----------------------------------------------------------------
  NUMBER OF    8    SHARED VOTING POWER
   SHARES           
BENEFICIALLY        0
  OWNED BY     -----------------------------------------------------------------
    EACH       9    SOLE DISPOSITIVE POWER
  REPORTING         
   PERSON           222,770
    WITH       -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
                    
                    0
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     1,073,010 shares (31.1%)
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES   |_|


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     31.1%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON

     PN
--------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                       3


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON

     The D3 Children's Fund, L.P. (David Nierenberg is president of the General
     Partner, which is Nierenberg Investment Management Company.)
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                 (a)  |X| 
                                                                 (b)  |_| 
--------------------------------------------------------------------------------
3    SEC USE ONLY


--------------------------------------------------------------------------------
4    SOURCE OF FUNDS

     WC
--------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   |_| 


--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     USA
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER
                    
                    48,224 common shares (1.4%)
               -----------------------------------------------------------------
  NUMBER OF    8    SHARED VOTING POWER
   SHARES           
BENEFICIALLY        0
  OWNED BY     -----------------------------------------------------------------
    EACH       9    SOLE DISPOSITIVE POWER
  REPORTING         
   PERSON           48,224
    WITH       -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
                    
                    0
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     1,073,010 shares (31.1%)
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES   |_|


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     31.1%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON

     PN
--------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                       4


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON

     The D3 Offshore Fund, L.P. (David Nierenberg is president of the General
     Partner, which is Nierenberg Investment Management Company.)
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                 (a)  |X| 
                                                                 (b)  |_| 
--------------------------------------------------------------------------------
3    SEC USE ONLY


--------------------------------------------------------------------------------
4    SOURCE OF FUNDS

     WC
--------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   |_| 


--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     USA
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER
                    
                    202,710 common shares (5.9%)
               -----------------------------------------------------------------
  NUMBER OF    8    SHARED VOTING POWER
   SHARES           
BENEFICIALLY        0
  OWNED BY     -----------------------------------------------------------------
    EACH       9    SOLE DISPOSITIVE POWER
  REPORTING         
   PERSON           202,710
    WITH       -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
                    
                    0
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     1,073,010 shares (31.1%)
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES   |_|


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     31.1%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON

     PN
--------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                       5


--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON

     The D3 Family Bulldog Fund, L.P. ((David Nierenberg is president of the
     General Partner, which is Nierenberg Investment Management Company.)
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                 (a)  |X| 
                                                                 (b)  |_| 
--------------------------------------------------------------------------------
3    SEC USE ONLY


--------------------------------------------------------------------------------
4    SOURCE OF FUNDS

     WC
--------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
     PURSUANT TO ITEMS 2(d) OR 2(e)                                   |_| 


--------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

     USA
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER
                    
                    54,000 common shares (1.6%)
               -----------------------------------------------------------------
  NUMBER OF    8    SHARED VOTING POWER
   SHARES           
BENEFICIALLY        0
  OWNED BY     -----------------------------------------------------------------
    EACH       9    SOLE DISPOSITIVE POWER
  REPORTING         
   PERSON           54,000
    WITH       -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER
                    
                    0
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     1,073,010 shares (31.1%)
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES   |_|


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     31.1%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON

     PN
--------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                       6


Item 1.     Security and Issuer.

            Common stock in Mexican Restaurants, Inc. (CASA), 1135 Edgebrook,
            Houston, TX 77034-1899.

Item 2.     Identity and Background.

            The D3 Family Fund, L.P. is a Washington State limited partnership,
            whose principal business is investing in the equities of public
            micro-cap issuers. Located at 19605 N.E. 8th St., Camas, Washington
            98607. No convictions or administrative proceedings as described in
            2 (d) and (e).

Item 3.     Source and Amount of Funds or Other Consideration

            Source of funds is money invested in the partnership by its
            partners.

Item 4.     Purpose of Transaction

            For investment purposes.

Item 5.     Interest in Securities of the Issuer.

            (a,b) The D3 Family Fund, L.P. owns and has sole voting and
            dispositive power over 545,306 common shares of CASA.

            (c) N/A
            (d) N/A 
            (e) N/A

Item 6.     Contracts, Arrangements, Understandings or Relationships with
            Respect to Securities of the Issuer.

            N/A

Item 7.     Material to be Filed as Exhibits

            N/A

                                    SIGNATURE

      After reasonable inquiry and to the best of my knowledge and belief, each
of the undersigned certifies that the information set forth in the Statement is
true, complete and correct.


      September 9, 2005                 /s/ DAVID NIERENBERG
      -----------------                 --------------------
                                        David Nierenberg
                                        President
                                        Nierenberg Investment Management
                                        Company, Inc., the General Partner of 
                                        The D3 Family Fund, L.P


                                       7


Item 1.     Security and Issuer.

            Common stock in Mexican Restaurants, Inc. (CASA), 1135 Edgebrook,
            Houston, TX 77034-1899.

Item 2.     Identity and Background.

            The D3 Family Retirement Fund, L.P. is a Washington State limited
            partnership, whose principal Business is investing in the equities
            of public micro-cap issuers. Located at 19605 N.E. 8th St., Camas,
            Washington 98607. No convictions or administrative proceedings as
            described in 2 (d) and (e).

Item 3.     Source and Amount of Funds or Other Consideration

            Source of funds is money invested in the partnership by its
            partners.

Item 4.     Purpose of Transaction

            For investment purposes.

Item 5.     Interest in Securities of the Issuer.

            (a,b) The D3 Family Retirement Fund, L.P. owns and has sole voting
            and dispositive power over 222,770 common shares of CASA.

            (c) N/A 
            (d) N/A 
            (e) N/A

Item 6.     Contracts, Arrangements, Understandings or Relationships with
            Respect to Securities of the Issuer.

            N/A

Item 7.     Material to be Filed as Exhibits

            N/A

Signature

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.


      September 9, 2005                 /s/ DAVID NIERENBERG
      -----------------                 --------------------
                                        David Nierenberg
                                        President
                                        Nierenberg Investment Management
                                        Company, Inc., the General Partner of 
                                        The D3 Family Fund, L.P


                                       8


Item 1.     Security and Issuer.

            Common stock in Mexican Restaurants, Inc. (CASA), 1135 Edgebrook,
            Houston, TX 77034-1899.

Item 2.     Identity and Background.

            The D3 Children's Fund, L.P. is a Washington State limited
            partnership, whose principal business is investing in the equities
            of public micro-cap Issuers. Located at 19605 N.E. 8th St., Camas,
            Washington 98607. No convictions or administrative proceedings as
            described in 2 (d) and (e).

Item 3.     Source and Amount of Funds or Other Consideration

            Source of funds is money invested in the partnership by its
            partners.

Item 4.     Purpose of Transaction

            For investment purposes.

Item 5.     Interest in Securities of the Issuer.

            (a,b) The D3 Children's Fund, L.P. owns and has sole voting and
            dispositive power over 48,224 common shares of CASA.

            (c) N/A 
            (d) N/A 
            (e) N/A

Item 6.     Contracts, Arrangements, Understandings or Relationships with
            Respect to Securities of the Issuer.

            N/A

Item 7.     Material to be Filed as Exhibits

            N/A

                                    SIGNATURE

      After reasonable inquiry and to the best of my knowledge and belief, each
of the undersigned certifies that the information set forth in the Statement is
true, complete and correct.


      September 9, 2005                 /s/ DAVID NIERENBERG
      -----------------                 --------------------
                                        David Nierenberg
                                        President
                                        Nierenberg Investment Management
                                        Company, Inc., the General Partner of 
                                        The D3 Family Fund, L.P


                                       9


Item 1.     Security and Issuer.

            Common stock in Mexican Restaurants, Inc. (CASA), 1135 Edgebrook,
            Houston, TX 77034-1899.

Item 2.     Identity and Background.

            The D3 Offshore Fund, L.P. is a Washington State limited
            partnership, whose principal business is investing in the equities
            of public micro-cap issuers. Located at 19605 N.E. 8th St., Camas,
            Washington 98607. No convictions or administrative proceedings as
            described in 2 (d) and (e).

Item 3.     Source and Amount of Funds or Other Consideration

            Source of funds is money invested in the partnership by its
            partners.

Item 4.     Purpose of Transaction

            For investment purposes.

Item 5.     Interest in Securities of the Issuer.

            (a,b) The D3 Offshore Fund, L.P. owns and has sole voting and
            dispositive power over 202,710 common shares of CASA.

            (c) Date             Shares Bought          Price 
                8/19/2005        22,000                 9.40
                8/24/2005         5,100                 9.31
                8/30/2005        12,260                 9.64
                8/31/2005           350                 9.68
                9/02/2005        30,600                 9.58
                                               
            (d) N/A 
            (e) N/A

Item 6.     Contracts, Arrangements, Understandings or Relationships with
            Respect to Securities of the Issuer.

            N/A

Item 7.     Material to be Filed as Exhibits

            N/A

                                    SIGNATURE

      After reasonable inquiry and to the best of my knowledge and belief, each
of the undersigned certifies that the information set forth in the Statement is
true, complete and correct.


      September 9, 2005                 /s/ DAVID NIERENBERG
      -----------------                 --------------------
                                        David Nierenberg
                                        President
                                        Nierenberg Investment Management
                                        Company, Inc., the General Partner of 
                                        The D3 Family Fund, L.P


                                       10


Item 1.     Security and Issuer.

            Common stock in Mexican Restaurants, Inc. (CASA), 1135 Edgebrook,
            Houston, TX 77034-1899.

Item 2.     Identity and Background.

            The D3 Family Bulldog Fund, L.P. is a Washington State limited
            partnership, whose principal business is investing in the equities
            of public micro-cap issuers. Located at 19605 N.E. 8th St., Camas,
            Washington 98607. No convictions or administrative proceedings as
            described in 2 (d) and (e).

Item 3.     Source and Amount of Funds or Other Consideration

            Source of funds is money invested in the partnership by its
            partners.

Item 4.     Purpose of Transaction

            For investment purposes.

Item 5.     Interest in Securities of the Issuer.

            (a,b) The D3 Family Bulldog Fund, L.P. owns and has sole voting and
            dispositive power over 54,000 common shares of CASA.

            (c) N/A 
            (d) N/A 
            (e) N/A

Item 6.     Contracts, Arrangements, Understandings or Relationships with
            Respect to Securities of the Issuer.

            N/A

Item 7.     Material to be Filed as Exhibits

            N/A

                                    SIGNATURE

      After reasonable inquiry and to the best of my knowledge and belief, each
of the undersigned certifies that the information set forth in the Statement is
true, complete and correct.


      September 9, 2005                 /s/ DAVID NIERENBERG
      -----------------                 --------------------
                                        David Nierenberg
                                        President
                                        Nierenberg Investment Management
                                        Company, Inc., the General Partner of 
                                        The D3 Family Fund, L.P


                                       11