MORGENTHALER VENTURE PARTNERS II
SC 13G/A, 1999-02-12
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                               UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549


                                  SCHEDULE 13G


                   UNDER THE SECURITIES EXCHANGE ACT OF 1934

                              (Amendment No.2)*




                                 Gliatech, Inc.
  -----------------------------------------------------------------------------
                                (Name of Issuer)



                        Common Stock, $0.01 par value
  -----------------------------------------------------------------------------
                         (Title of Class of Securities)


                                  37929C 103
  -----------------------------------------------------------------------------
                                 (CUSIP Number)




Check the following box if a fee is being paid with this statement [ ] . (A 
fee is not required only if the filing person: (1) has a previous statement on
file reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)  
(See Rule 13d-7).


*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.


The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities
Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that
section of the Act but shall be subject to all other provisions of the Act
(however, see the Notes).






                                  Page 1 of 16


<PAGE>   2
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  37929C 103                                                            PAGE 2 OF 16 PAGES
<S>     <C>               

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Morgenthaler Venture Partners II       34-1443153                                                | 
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              | 
|     |                                                                                                   |
|     |  Ohio                                                                                             |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     5 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |     0                                                           |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     6 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |     0                                                           |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     7 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |     0                                                           |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |     8 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |     0                                                           |
|-------------------------------|-------|-----------------------------------------------------------------|
|   9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  10 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN                                     |
|     | SHARES*                                                                                     [   ] | 
|     |                                                                                              ---- | 
|-----|---------------------------------------------------------------------------------------------------|
|  11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                                                 |
|     |                                                                                                   |
|     |  0.0%                                                                                             |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  PN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>   3
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO. 37929C 103                                                               PAGE 3 OF 16 PAGES
<S>     <C>               

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Morgenthaler Management Partners II       34-1443154                                             | 
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              | 
|     |                                                                                                   |
|     |  Ohio                                                                                             |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     5 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |     0                                                           |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     6 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |     0                                                           |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     7 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |     0                                                           |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |     8 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |     0                                                           |
|-------------------------------|-------|-----------------------------------------------------------------|
|   9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  10 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN                                     |
|     | SHARES*                                                                                     [   ] | 
|     |                                                                                              ---- | 
|-----|---------------------------------------------------------------------------------------------------|
|  11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                                                 |
|     |                                                                                                   |
|     |  0                                                                                             |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  PN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>
                     *SEE INSTRUCTION BEFORE FILLING OUT!

<PAGE>   4
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  37929C 103                                                               PAGE 4 OF 16 PAGES
<S>     <C>               

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  David T. Morgenthaler  ###-##-####                                                               | 
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              | 
|     |                                                                                                   |
|     |  United States                                                                                    |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     5 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |   0                                                             |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     6 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |   0                                                             |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     7 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |   0                                                             |
|                               |       |                                                                 |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |     8 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |   0                                                             |
|-------------------------------|-------|-----------------------------------------------------------------|
|   9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  10 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN                                     |
|     | SHARES*                                                                                     [   ] | 
|     |                                                                                              ---- | 
|-----|---------------------------------------------------------------------------------------------------|
|  11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                                                 |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  IN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>
                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>   5
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  37929C 103                                                              PAGE 5 OF 16 PAGES
<S>     <C>               

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |   Morgenthaler Family Partnership 34-1338916                                                      | 
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              | 
|     |                                                                                                   |
|     |  Ohio                                                                                             |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     5 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |   0                                                             |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     6 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |   0                                                             |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     7 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |   0                                                             |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |     8 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |   0                                                             |
|-------------------------------|-------|-----------------------------------------------------------------|
|   9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  10 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN                                     |
|     | SHARES*                                                                                     [   ] | 
|     |                                                                                              ---- | 
|-----|---------------------------------------------------------------------------------------------------|
|  11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                                                 |
|     |                                                                                                   |
|     |  0                                                                                                |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  PN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>
                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>   6
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  37929C 103                                                               PAGE 6 OF 16 PAGES
<S>     <C>               

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Robert D. Pavey        ###-##-####                                                               | 
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              | 
|     |                                                                                                   |
|     |  United States                                                                                    |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     5 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |                                                                 |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     6 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |     4,400 Note (1)                                              |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     7 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |                                                                 |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |     8 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |     4,400 Note (1)                                              |
|-------------------------------|-------|-----------------------------------------------------------------|
|   9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |   4,400                                                                                           |
|-----|---------------------------------------------------------------------------------------------------|
|  10 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN                                     |
|     | SHARES*                                                                                     [   ] | 
|     |                                                                                              ---- | 
|-----|---------------------------------------------------------------------------------------------------|
|  11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                                                 |
|     |                                                                                                   |
|     |   0.05%                                                                                           |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |   IN                                                                                              |
- -----------------------------------------------------------------------------------------------------------
</TABLE>
                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>   7
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  37929C 103                                                            PAGE 7 OF 16 PAGES
<S>     <C>               

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |   Pavey Family Partnership   34-1338919                                                           | 
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              | 
|     |                                                                                                   |
|     |  Ohio                                                                                             |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     5 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |   4,400                                                         |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     6 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |                                                                 |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     7 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |                                                                 |
|                               |       |   4,400                                                         |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |     8 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |                                                                 |
|-------------------------------|-------|-----------------------------------------------------------------|
|   9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |   4,400                                                                                           |
|-----|---------------------------------------------------------------------------------------------------|
|  10 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN                                     |
|     | SHARES*                                                                                     [   ] | 
|     |                                                                                              ---- | 
|-----|---------------------------------------------------------------------------------------------------|
|  11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                                                 |
|     |                                                                                                   |
|     |  0.05%                                                                                            |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |  PN                                                                                               |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>   8
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  37929C 103                                                            PAGE 8 OF 16 PAGES
<S>     <C>               

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Paul S. Brentlinger  ###-##-####                                                                 | 
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              | 
|     |                                                                                                   |
|     |   United States                                                                                   |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     5 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |  0                                                              |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     6 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |  0                                                              |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     7 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |  0                                                              |
|                               |       |                                                                 |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |     8 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |  0                                                              |
|-------------------------------|-------|-----------------------------------------------------------------|
|   9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |   0                                                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|  10 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN                                     |
|     | SHARES*                                                                                     [   ] | 
|     |                                                                                              ---- | 
|-----|---------------------------------------------------------------------------------------------------|
|  11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                                                 |
|     |                                                                                                   |
|     |   0                                                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |   IN                                                                                              |
- -----------------------------------------------------------------------------------------------------------
</TABLE>
                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>   9
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  37929C 103                                                            PAGE 9 OF 16 PAGES
<S>     <C>               

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Robert C. Bellas, Jr.   ###-##-####                                                              | 
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              | 
|     |                                                                                                   |
|     |   United States                                                                                   |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     5 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |  0                                                              |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     6 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |  0                                                              |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     7 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |  0                                                              |
|                               |       |                                                                 |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |     8 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |  0                                                              |
|-------------------------------|-------|-----------------------------------------------------------------|
|   9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |   0                                                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|  10 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN                                     |
|     | SHARES*                                                                                     [   ] | 
|     |                                                                                              ---- | 
|-----|---------------------------------------------------------------------------------------------------|
|  11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                                                 |
|     |                                                                                                   |
|     |   0                                                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |   IN                                                                                              |
- -----------------------------------------------------------------------------------------------------------
</TABLE>
                     *SEE INSTRUCTION BEFORE FILLING OUT!

<PAGE>   10
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  37929C 103                                                            PAGE 10 OF 16 PAGES
<S>     <C>               

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Bellas Family Partnership  34-1501617                                                            | 
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              | 
|     |                                                                                                   |
|     |  Ohio                                                                                             |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     5 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |  0                                                              |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     6 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |  0                                                              |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     7 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |  0                                                              |
|                               |       |                                                                 |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |     8 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |  0                                                              |
|-------------------------------|-------|-----------------------------------------------------------------|
|   9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |   0                                                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|  10 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN                                     |
|     | SHARES*                                                                                     [   ] | 
|     |                                                                                              ---- | 
|-----|---------------------------------------------------------------------------------------------------|
|  11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                                                 |
|     |                                                                                                   |
|     |   0                                                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |   PN                                                                                              |
- -----------------------------------------------------------------------------------------------------------
</TABLE>

                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>   11
                                                SCHEDULE 13G
<TABLE>
 CUSIP NO.  37929C 103                                                            PAGE 11 OF 16 PAGES
<S>     <C>               

- -----------------------------------------------------------------------------------------------------------
|   1 | NAME OF REPORTING PERSON                                                                          |
|     | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                                                 |
|     |                                                                                                   |
|     |  Gary J. Morgenthaler  ###-##-####                                                                | 
|-----|---------------------------------------------------------------------------------------------------|
|   2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                                       (a) [   ] |
|     |                                                                                              ---- |
|     |                                                                                         (b) [   ] |
|     |                                                                                              ---- |
|-----|---------------------------------------------------------------------------------------------------|
|   3 | SEC USE ONLY                                                                                      |
|     |                                                                                                   |
|-----|---------------------------------------------------------------------------------------------------|
|   4 | CITIZENSHIP OR PLACE OF ORGANIZATION                                                              | 
|     |                                                                                                   |
|     |   United States                                                                                   |
|-------------------------------|-------|-----------------------------------------------------------------|
|            NUMBER OF          |     5 |  SOLE VOTING POWER                                              |
|                               |       |                                                                 |
|             SHARES            |       |  0                                                              |
|                               |-------|-----------------------------------------------------------------|
|          BENEFICIALLY         |     6 |  SHARED VOTING POWER                                            |
|                               |       |                                                                 |
|            OWNED BY           |       |  0                                                              |
|                               |-------|-----------------------------------------------------------------|
|              EACH             |     7 |  SOLE DISPOSITIVE POWER                                         |
|                               |       |                                                                 |
|            REPORTING          |       |  0                                                              |
|                               |       |                                                                 |
|             PERSON            |-------|-----------------------------------------------------------------|
|                               |     8 |  SHARED DISPOSITIVE POWER                                       |
|              WITH             |       |                                                                 |
|                               |       |  0                                                              |
|-------------------------------|-------|-----------------------------------------------------------------|
|   9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON                                      |
|     |                                                                                                   |
|     |   0                                                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|  10 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN                                     |
|     | SHARES*                                                                                     [   ] | 
|     |                                                                                              ---- | 
|-----|---------------------------------------------------------------------------------------------------|
|  11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                                                 |
|     |                                                                                                   |
|     |   0                                                                                               |
|-----|---------------------------------------------------------------------------------------------------|
|  12 | TYPE OF REPORTING PERSON*                                                                         |
|     |                                                                                                   |
|     |   IN                                                                                              |
- -----------------------------------------------------------------------------------------------------------
</TABLE>
                     *SEE INSTRUCTION BEFORE FILLING OUT!

<PAGE>   12
                                  Schedule 13G
                                  ------------


Item 1(a). NAME OF ISSUER: Gliatech, Inc.

Item 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: 23420 Commerce Park
           Road, Cleveland, OH 44122

Item 2(a). NAMES OF PERSONS FILING: Morgenthaler Venture Partners II ("MVP II");
           Morgenthaler Management Partners II ("MMP II"), the general
           partner of MVP II; David T. Morgenthaler, Robert D. Pavey, Robert
           C. Bellas, Jr., Gary J. Morgenthaler, Paul S. Brentlinger,
           Morgenthaler Family Partnership, Pavey Family Partnership, and
           Bellas Family Partnership (collectively, the "General Partners")
           are individual general partners of MMP II, the general partner of
           MVP II.

Item 2(b). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:

           The address of the principal business office of MVP II, MMP II
           and each of the General Partners is:

           Morgenthaler Venture Partners II
           629 Euclid Avenue
           Suite 700
           Cleveland, Ohio 44114

Item 2(c). CITIZENSHIP: MVP II is a limited partnership and MMP II is a general
           partnership organized under the laws of the State of Ohio. Each
           of the individual General Partners is a United States citizen,
           and each partnership has been organized under the laws of the
           state of Ohio.

Item 2(d). TITLE OF CLASS OF SECURITIES:  Common Stock, par value $0.01

Item 2(e). CUSIP NUMBER:   37929C 103

Item 3.    IF THIS STATEMENT IS FILED PURSUANT TO RULES 13d-1(b), OR 13d-2(b),
           CHECK WHETHER THE PERSON FILING IS A:

          (a)  [  ] Broker or Dealer registered under Section 15 of the
                    Securities Exchange Act of 1934 (the "Act").

          (b)  [  ] Bank as defined in Section 3(a)(6) of the Act.

          (c)  [  ] Insurance Company as defined in Section 3(a)(19) of the
                    Act.

          (d)  [  ] Investment Company registered under Section 8 of the
                    Investment Company Act of 1940.

          (e)  [  ] Investment Advisor registered under Section 203 of the 
                    Investment Advisors Act of 1940. 


<PAGE>   13

          (f)  [  ] Employee Benefit Plan, Pension Fund which is subject to the 
                    provisions of the Employee Retirement Income Security Act of
                    1974 or Endowment Fund; see Rule 13d-1(b)(1)(ii)(f) of
                    the Act.

          (g)  [  ] Parent Holding Company, in accordance with Rule 
                    13d-1(b)(ii)(G) of the Act.

          (h)  [  ] Group, in accordance with Rule 13d-1(b)(1)(ii)(H) of 
                    the Act.

          Not Applicable.

Item 4.   OWNERSHIP.

          (a)  Amount Beneficially Owned: Each of MVP II and MMP II may be
               deemed to own beneficially 0 shares of the Common Stock of
               Gliatech, Inc. (the "Company") as of December 31, 1998. Each of
               the General Partners are General Partners of Morgenthaler
               Management Partners III (MMP III), which is the General Partner
               of Morgenthaler Venture Partners III (MVP III). MVP III owns 0
               shares of Common Stock. Each of the General Partners may be
               deemed to own beneficially the following number of shares of the
               Company's Common Stock as of December 31, 1998:

               MVP II: 0 shares                          
               MMP II: 0 shares                          
               David T. Morgenthaler: 0 shares           
               Robert D. Pavey: 4,400 shares                 
               Robert C. Bellas, Jr.: 0 shares           
               Gary J. Morgenthaler: 0 shares            
               Paul S. Brentlinger: 0 shares             
               Morgenthaler Family Partnership: 0 shares 
               Pavey Family Partnership: 4,400 shares        
               Bellas Family Partnership: 0 shares       
               
          (b)  Percent of Class (based on 9,410,825 shares of Common Stock):

               MVP II: 0                          
               MMP II: 0                          
               David T. Morgenthaler: 0           
               Robert D. Pavey: 0.05%                 
               Robert C. Bellas, Jr.: 0
               Gary J. Morgenthaler: 0            
               Paul S. Brentlinger: 0             
               Morgenthaler Family Partnership: 0 
               Pavey Family Partnership: 0.05%        
               Bellas Family Partnership: 0       
<PAGE>   14

          (c)  Number of shares as to which such person has:

               (i)  sole power to vote or to direct the vote:

                    Pavey Family Partnership: 4,400 shares

               (ii) shared power to vote or to direct the vote:

                    MVP II: 0 shares                         
                    MMP II: 0 shares                         
                    David T. Morgenthaler: 0 shares          
                    Robert D. Pavey: 4,400 shares                
                    Robert C. Bellas, Jr.: 0 shares          
                    Gary J. Morgenthaler: 0 shares           
                    Paul S. Brentlinger: 0 shares            
                    Morgenthaler Family Partnership: 0 shares
                    Pavey Family Partnership: 0 shares       
                    Bellas Family Partnership: 0 shares      
                    
              (iii) sole power to dispose or direct the disposition of:

                    Pavey Family Partnership: 4,400 shares                  
                    
               (iv) shared power to dispose or direct the disposition of:

                    MVP II: 0 shares                          
                    MMP II: 0 shares                          
                    David T. Morgenthaler: 0 shares           
                    Robert D. Pavey: 4,400 shares                 
                    Robert C. Bellas, Jr.: 0 shares           
                    Gary J. Morgenthaler: 0 shares         
                    Paul S. Brentlinger: 0 shares             
                    Morgenthaler Family Partnership: 0 shares 
                    Pavey Family Partnership: 0 shares        
                    Bellas Family Partnership: 0 shares       
                    

Item 5.        OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

               This statement is being filed to report the fact that as of the
               date hereof the reporting person has ceased to be the beneficial
               owner of more than five percent of the class of securities.


<PAGE>   15
               
Item 6.        OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON. 

               Not Applicable.

Item 7.        IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH 
               ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING 
               COMPANY.

               Not Applicable.

Item 8.        IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

               Not Applicable. MVP II, MMP II and each of the General Partners
               expressly disclaim membership in a "group" as defined in Rule
               13d-1(b)(ii)(H).

Item 9.        NOTICE OF DISSOLUTION OF GROUP.

               Not Applicable.

Item 10.       CERTIFICATION.

               Not Applicable. This statement on Schedule 13G is not filed
               pursuant to Rule 13d-1(b).




Gliatech, Inc.
Schedule 13G
Information included in report as of 12/31/98.


Footnotes


(1)  Amount includes 4,400 shares owned by Pavey Family Partnership (PFP). The
     reporting person is a general partner of PFP.


By signing below, I certify that, to the best of my knowledge and belief, the
securities referred to above were not acquired for the purpose of and do not
have the effect of changing or influencing the control of the issuer of such
securities and were not acquired in connection with or as a participant in any
transaction having such purposes or effect.

<PAGE>   16

                                   SIGNATURES
                                   ----------

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

Date:  

MORGENTHALER VENTURE PARTNERS II

By:     Morgenthaler Management Partners II

By:     *
        -------------------------- 
        General Partner

MORGENTHALER MANAGEMENT PARTNERS II     MORGENTHALER FAMILY PARTNERSHIP

By:               *                By:             *
        --------------------------      -------------------------
        General Partner                 General Partner

                  *                                *
        --------------------------      -------------------------
        David T. Morgenthaler           David T. Morgenthaler

                  *                                *
        --------------------------      -------------------------
        Robert D. Pavey                 Lindsay J. Morgenthaler

                  *                                *
        --------------------------      -------------------------
        Robert C. Bellas, Jr.           Gary J. Morgenthaler

                  *                                *
        --------------------------      -------------------------
        Gary J. Morgenthaler            Todd W. Morgenthaler

                  *                                *
        --------------------------      -------------------------
        Paul S. Brentlinger             Gaye E. Morgenthaler

                  *                                *
        --------------------------      -------------------------
        John D. Lutsi                   Trustee, Elizabeth J. Morgenthaler

BELLAS FAMILY PARTNERSHIP       PAVEY FAMILY PARTNERSHIP

By:               *                By:             *
        --------------------------      -------------------------
        General Partner                 General Partner

                  *                                *
        --------------------------      -------------------------
        Robert C. Bellas, Jr.           Robert D. Pavey

                  *                                *
        --------------------------      -------------------------
        Terrye L. Bellas                Patricia L. Pavey

                  *                                *
        --------------------------      -------------------------
        Trustee, Terrye L. Bellas       Susan D. Pavey

                  *                                *
        --------------------------      -------------------------
        Trustee, Terrye L. Bellas       Deborah L. Pavey

                                 *By:    /s/ Theodore A. Laufik
                                        -------------------------
                                        Theodore A. Laufik
                                        Attorney-in-Fact


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