MERRIMAC SERIES
NSAR-B, 1999-02-24
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<PAGE>      PAGE  1
000 B000000 12/31/98
000 C000000 1059238
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 MERRIMAC SERIES
001 B000000 811-08741
001 C000000 8886377622
002 A000000 200 CLARENDON STREET
002 B000000 BOSTON
002 C000000 MA
002 D010000 02116
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  3
007 C010100  1
007 C020100 MERRIMAC CASH SERIES
007 C030100 N
007 C010200  2
007 C020200 MERRIMAC TREASURY SERIES
007 C030200 N
007 C010300  3
007 C020300 MERRIMAC SHORT-TERM ASSET RESERVE SERIES
007 C030300 N
007 C010400  4
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
010 A00AA01 INVESTORS BANK & TRUST COMPANY
010 C01AA01 BOSTON
010 C02AA01 MA
010 C03AA01 02116
011 A00AA01 FUNDS DISTRIBUTOR, INC.
011 B00AA01 8-20518
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02109
012 A00AA01 INVESTORS BANK & TRUST COMPANY
012 B00AA01 85-720
012 C01AA01 BOSTON
012 C02AA01 MA
<PAGE>      PAGE  2
012 C03AA01 02116
013 A00AA01 ERNST & YOUNG L.L.P.
013 B01AA01 BOSTON
013 B02AA01 MA
013 B03AA01 02116
015 A00AA01 INVESTORS BANK & TRUST COMPANY
015 B00AA01 C
015 C01AA01 BOSTON
015 C02AA01 MA
015 C03AA01 02116
015 E01AA01 X
018  00AA00 Y
019 A00AA00 Y
019 B00AA00    7
019 C00AA00 MERRIMAC--
020 C000001      0
020 C000002      0
020 C000003      0
020 C000004      0
020 C000005      0
020 C000006      0
020 C000007      0
020 C000008      0
020 C000009      0
020 C000010      0
021  000000        0
022 A000001 MERRIMAC CASH PORTFOLIO
022 B000001 04-3334601
022 C000001    445925
022 D000001    334761
022 A000002 MERRIMAC TREASURY PORTFOLIO
022 B000002 52-2021984
022 C000002    285701
022 D000002    172594
022 A000003 STANDISH STAR PORTFOLIO
022 B000003 04-3403866
022 C000003     14108
022 D000003     13217
022 C000004         0
022 D000004         0
022 C000005         0
022 D000005         0
022 C000006         0
022 D000006         0
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<PAGE>      PAGE  3
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025 D00AA08       0
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026 C000000 N
026 D000000 N
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
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029  00AA00 N
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030 B00AA00  0.00
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031 B00AA00      0
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033  00AA00      0
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036 B00AA00      0
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<PAGE>      PAGE  4
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055 A00AA00 N
055 B00AA00 N
056  00AA00 N
057  00AA00 N
058 A00AA00 N
058 B00AA00 N
058 C00AA00 N
058 D00AA00 N
058 E00AA00 N
059  00AA00 Y
060 A00AA00 Y
060 B00AA00 Y
061  00AA00    10000
066 A00AA00 N
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068 A00AA00 N
068 B00AA00 N
069  00AA00 N
077 A000000 Y
077 B000000 Y
077 C000000 Y
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080 A00AA00 NATIONAL UNION FIRE INSURANCE COMPANY
080 C00AA00     2000
081 A00AA00 Y
081 B00AA00   4
082 A00AA00 Y
082 B00AA00        5
083 A00AA00 N
083 B00AA00        0
<PAGE>      PAGE  5
084 A00AA00 N
084 B00AA00        0
085 A00AA00 Y
085 B00AA00 N
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<PAGE>      PAGE  6
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062 O000100   0.0
062 P000100   0.0
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063 B000100  0.0
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070 C010100 N
070 C020100 N
070 D010100 N
070 D020100 N
070 E010100 N
070 E020100 N
070 F010100 N
070 F020100 N
070 G010100 N
070 G020100 N
070 H010100 N
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 Y
070 K010100 Y
070 K020100 N
070 L010100 Y
070 L020100 Y
070 M010100 N
070 M020100 N
070 N010100 Y
070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 N
070 P020100 N
070 Q010100 N
070 Q020100 N
070 R010100 N
<PAGE>      PAGE  7
070 R020100 N
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072DD020100     4392
072EE000100        0
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073 A020100   0.0262
073 B000100   0.0000
073 C000100   0.0000
074 A000100        0
074 B000100        0
074 C000100        0
074 D000100        0
074 E000100        0
074 F000100        0
074 G000100        0
074 H000100        0
074 I000100   115929
<PAGE>      PAGE  8
074 J000100        0
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074 L000100        0
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074 N000100   115946
074 O000100        0
074 P000100        1
074 Q000100        0
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074 R040100      718
074 S000100        0
074 T000100   115227
074 U010100      100
074 U020100   115123
074 V010100     1.00
074 V020100     1.00
074 W000100   1.0004
074 X000100        3
074 Y000100        0
075 A000100   168529
075 B000100        0
076  000100     0.00
028 A010200     16355
028 A020200         0
028 A030200         0
028 A040200      8874
028 B010200     46632
028 B020200         0
028 B030200         0
028 B040200     12777
028 C010200     35384
028 C020200         0
028 C030200         0
028 C040200     50560
028 D010200     63522
028 D020200         0
028 D030200         0
028 D040200     44479
028 E010200      9873
028 E020200         0
028 E030200         0
028 E040200     15786
028 F010200     73130
028 F020200         0
028 F030200         0
028 F040200     35652
028 G010200    244896
028 G020200         0
028 G030200         0
<PAGE>      PAGE  9
028 G040200    168128
028 H000200         0
062 A000200 Y
062 B000200   0.0
062 C000200   0.0
062 D000200   0.0
062 E000200   0.0
062 F000200   0.0
062 G000200   0.0
062 H000200   0.0
062 I000200   0.0
062 J000200   0.0
062 K000200   0.0
062 L000200 100.4
062 M000200   0.0
062 N000200   0.0
062 O000200   0.0
062 P000200   0.0
062 Q000200   0.0
062 R000200   0.0
063 A000200  31
063 B000200  0.0
064 A000200 N
064 B000200 N
070 A010200 N
070 A020200 N
070 B010200 N
070 B020200 N
070 C010200 N
070 C020200 N
070 D010200 N
070 D020200 N
070 E010200 N
070 E020200 N
070 F010200 N
070 F020200 N
070 G010200 N
070 G020200 N
070 H010200 N
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 N
070 J020200 N
070 K010200 Y
070 K020200 N
070 L010200 N
070 L020200 N
070 M010200 N
070 M020200 N
070 N010200 Y
<PAGE>      PAGE  10
070 N020200 N
070 O010200 Y
070 O020200 N
070 P010200 N
070 P020200 N
070 Q010200 N
070 Q020200 N
070 R010200 N
070 R020200 N
071 A000200         0
071 B000200         0
071 C000200         0
071 D000200    0
072 A000200  7
072 B000200     1618
072 C000200        0
072 D000200        0
072 E000200        0
072 F000200        0
072 G000200        4
072 H000200        0
072 I000200        0
072 J000200        0
072 K000200        0
072 L000200        1
072 M000200        1
072 N000200       33
072 O000200        0
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072 R000200        8
072 S000200        8
072 T000200        0
072 U000200        1
072 V000200        0
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072 X000200      148
072 Y000200        0
072 Z000200     1470
072AA000200        1
072BB000200        0
072CC010200        0
072CC020200        0
072DD010200     1470
072DD020200        0
072EE000200        0
073 A010200   0.0220
073 A020200   0.0000
073 B000200   0.0000
073 C000200   0.0000
074 A000200        0
<PAGE>      PAGE  11
074 B000200        0
074 C000200        0
074 D000200        0
074 E000200        0
074 F000200        0
074 G000200        0
074 H000200        0
074 I000200   114726
074 J000200        0
074 K000200        0
074 L000200        0
074 M000200       19
074 N000200   114745
074 O000200        0
074 P000200        1
074 Q000200        0
074 R010200        0
074 R020200        0
074 R030200        0
074 R040200      423
074 S000200        0
074 T000200   114321
074 U010200   114320
074 U020200        0
074 V010200     1.00
074 V020200     1.00
074 W000200   1.0003
074 X000200        1
074 Y000200        0
075 A000200    68048
075 B000200        0
076  000200     0.00
028 A010300         0
028 A020300         0
028 A030300         0
028 A040300         0
028 B010300     10000
028 B020300         0
028 B030300         0
028 B040300      4500
028 C010300         0
028 C020300        20
028 C030300         0
028 C040300         0
028 D010300         0
028 D020300        28
028 D030300         0
028 D040300         0
028 E010300      4000
028 E020300        27
028 E030300         0
<PAGE>      PAGE  12
028 E040300         0
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028 G010300     14000
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062 A000300 Y
062 B000300   0.0
062 C000300   0.0
062 D000300   0.0
062 E000300   0.0
062 F000300   0.0
062 G000300   0.0
062 H000300   0.0
062 I000300   0.0
062 J000300   0.0
062 K000300   0.0
062 L000300 100.7
062 M000300   0.0
062 N000300   0.0
062 O000300   0.0
062 P000300   0.0
062 Q000300   0.0
062 R000300   0.0
063 A000300   0
063 B000300  6.6
064 A000300 N
064 B000300 N
070 A010300 Y
070 A020300 Y
070 B010300 Y
070 B020300 N
070 C010300 Y
070 C020300 Y
070 D010300 Y
070 D020300 N
070 E010300 Y
070 E020300 Y
070 F010300 Y
070 F020300 N
070 G010300 Y
070 G020300 N
070 H010300 Y
070 H020300 N
070 I010300 N
070 I020300 N
070 J010300 Y
<PAGE>      PAGE  13
070 J020300 Y
070 K010300 Y
070 K020300 N
070 L010300 Y
070 L020300 Y
070 M010300 Y
070 M020300 Y
070 N010300 Y
070 N020300 N
070 O010300 Y
070 O020300 N
070 P010300 N
070 P020300 N
070 Q010300 N
070 Q020300 N
070 R010300 N
070 R020300 N
071 A000300    277247
071 B000300    259507
071 C000300    230518
071 D000300  113
072 A000300  5
072 B000300      125
072 C000300        0
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<PAGE>      PAGE  14
072DD010300      123
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072EE000300        0
073 A010300   0.2350
073 A020300   0.0000
073 B000300   0.0000
073 C000300   0.0000
074 A000300        0
074 B000300        0
074 C000300        0
074 D000300        0
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074 I000300     1015
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SIGNATURE   PAUL JASINSKI                                
TITLE       TREASURER           

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from Merrimac Series,
form N-SAR for the period ended December 31, 1998
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
   <NUMBER> 1
   <NAME>   Merrimac Cash Series Premium Class
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                         DEC-31-1998
<PERIOD-END>                              DEC-31-1998
<INVESTMENTS-AT-COST>                     115,928,788
<INVESTMENTS-AT-VALUE>                    115,928,788
<RECEIVABLES>                                       0
<ASSETS-OTHER>                                 17,170
<OTHER-ITEMS-ASSETS>                                0
<TOTAL-ASSETS>                            115,945,958
<PAYABLE-FOR-SECURITIES>                            0
<SENIOR-LONG-TERM-DEBT>                             0
<OTHER-ITEMS-LIABILITIES>                     718,849
<TOTAL-LIABILITIES>                           718,849
<SENIOR-EQUITY>                                     0
<PAID-IN-CAPITAL-COMMON>                  115,223,400
<SHARES-COMMON-STOCK>                         100,000
<SHARES-COMMON-PRIOR>                               0
<ACCUMULATED-NII-CURRENT>                           0
<OVERDISTRIBUTION-NII>                              0
<ACCUMULATED-NET-GAINS>                             2
<OVERDISTRIBUTION-GAINS>                            0
<ACCUM-APPREC-OR-DEPREC>                            0
<NET-ASSETS>                                  100,002
<DIVIDEND-INCOME>                                   0
<INTEREST-INCOME>                              34,071
<OTHER-INCOME>                                      0
<EXPENSES-NET>                                  2,042
<NET-INVESTMENT-INCOME>                        32,029
<REALIZED-GAINS-CURRENT>                            2
<APPREC-INCREASE-CURRENT>                           0
<NET-CHANGE-FROM-OPS>                          32,031
<EQUALIZATION>                                      0
<DISTRIBUTIONS-OF-INCOME>                      32,029
<DISTRIBUTIONS-OF-GAINS>                            0
<DISTRIBUTIONS-OTHER>                               0
<NUMBER-OF-SHARES-SOLD>                    33,618,994
<NUMBER-OF-SHARES-REDEEMED>                33,618,994
<SHARES-REINVESTED>                                 0
<NET-CHANGE-IN-ASSETS>                              0
<ACCUMULATED-NII-PRIOR>                             0
<ACCUMULATED-GAINS-PRIOR>                           0
<OVERDISTRIB-NII-PRIOR>                             0
<OVERDIST-NET-GAINS-PRIOR>                          0
<GROSS-ADVISORY-FEES>                               0
<INTEREST-EXPENSE>                                  0
<GROSS-EXPENSE>                               497,227
<AVERAGE-NET-ASSETS>                        1,161,652
<PER-SHARE-NAV-BEGIN>                            1.00
<PER-SHARE-NII>                                  0.03
<PER-SHARE-GAIN-APPREC>                          0.00
<PER-SHARE-DIVIDEND>                            (0.03)
<PER-SHARE-DISTRIBUTIONS>                        0.00
<RETURNS-OF-CAPITAL>                                0
<PER-SHARE-NAV-END>                              1.00
<EXPENSE-RATIO>                                  0.33
<AVG-DEBT-OUTSTANDING>                              0
<AVG-DEBT-PER-SHARE>                             0.00
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from Merrimac Series,
form N-SAR for the period ended December 31, 1998
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
   <NUMBER> 2
   <NAME>   Merrimac Cash Series Institutional Class
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                         DEC-31-1998
<PERIOD-END>                              DEC-31-1998
<INVESTMENTS-AT-COST>                     115,928,788
<INVESTMENTS-AT-VALUE>                    115,928,788
<RECEIVABLES>                                       0
<ASSETS-OTHER>                                 17,170
<OTHER-ITEMS-ASSETS>                                0
<TOTAL-ASSETS>                            115,945,958
<PAYABLE-FOR-SECURITIES>                            0
<SENIOR-LONG-TERM-DEBT>                             0
<OTHER-ITEMS-LIABILITIES>                     718,849
<TOTAL-LIABILITIES>                           718,849
<SENIOR-EQUITY>                                     0
<PAID-IN-CAPITAL-COMMON>                  115,223,400
<SHARES-COMMON-STOCK>                     115,123,400
<SHARES-COMMON-PRIOR>                               0
<ACCUMULATED-NII-CURRENT>                           0
<OVERDISTRIBUTION-NII>                              0
<ACCUMULATED-NET-GAINS>                         3,707
<OVERDISTRIBUTION-GAINS>                            0
<ACCUM-APPREC-OR-DEPREC>                            0
<NET-ASSETS>                              115,127,107
<DIVIDEND-INCOME>                                   0
<INTEREST-INCOME>                           4,887,531
<OTHER-INCOME>                                      0
<EXPENSES-NET>                                495,185
<NET-INVESTMENT-INCOME>                     4,392,346
<REALIZED-GAINS-CURRENT>                        3,707
<APPREC-INCREASE-CURRENT>                           0
<NET-CHANGE-FROM-OPS>                       4,396,053
<EQUALIZATION>                                      0
<DISTRIBUTIONS-OF-INCOME>                   4,392,346
<DISTRIBUTIONS-OF-GAINS>                            0
<DISTRIBUTIONS-OTHER>                               0
<NUMBER-OF-SHARES-SOLD>                   412,188,188
<NUMBER-OF-SHARES-REDEEMED>               297,082,990
<SHARES-REINVESTED>                            18,202
<NET-CHANGE-IN-ASSETS>                    115,123,400
<ACCUMULATED-NII-PRIOR>                             0
<ACCUMULATED-GAINS-PRIOR>                           0
<OVERDISTRIB-NII-PRIOR>                             0
<OVERDIST-NET-GAINS-PRIOR>                          0
<GROSS-ADVISORY-FEES>                               0
<INTEREST-EXPENSE>                                  0
<GROSS-EXPENSE>                               497,227
<AVERAGE-NET-ASSETS>                      167,366,852
<PER-SHARE-NAV-BEGIN>                            1.00
<PER-SHARE-NII>                                  0.03
<PER-SHARE-GAIN-APPREC>                          0.00
<PER-SHARE-DIVIDEND>                            (0.03)
<PER-SHARE-DISTRIBUTIONS>                        0.00
<RETURNS-OF-CAPITAL>                                0
<PER-SHARE-NAV-END>                              1.00
<EXPENSE-RATIO>                                  0.58
<AVG-DEBT-OUTSTANDING>                              0
<AVG-DEBT-PER-SHARE>                             0.00
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from Merrimac Series,
form N-SAR for the period ended December 31, 1998
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
   <NUMBER> 5
   <NAME>   Merrimac Treasury Series Institutional Cla
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                         DEC-31-1998
<PERIOD-END>                              DEC-31-1998
<INVESTMENTS-AT-COST>                     114,725,941
<INVESTMENTS-AT-VALUE>                    114,725,941
<RECEIVABLES>                                       0
<ASSETS-OTHER>                                      0
<OTHER-ITEMS-ASSETS>                           19,180
<TOTAL-ASSETS>                            114,745,121
<PAYABLE-FOR-SECURITIES>                            0
<SENIOR-LONG-TERM-DEBT>                             0
<OTHER-ITEMS-LIABILITIES>                     423,665
<TOTAL-LIABILITIES>                           423,665
<SENIOR-EQUITY>                                     0
<PAID-IN-CAPITAL-COMMON>                  114,320,187
<SHARES-COMMON-STOCK>                     114,320,187
<SHARES-COMMON-PRIOR>                               0
<ACCUMULATED-NII-CURRENT>                           0
<OVERDISTRIBUTION-NII>                              0
<ACCUMULATED-NET-GAINS>                         1,269
<OVERDISTRIBUTION-GAINS>                            0
<ACCUM-APPREC-OR-DEPREC>                            0
<NET-ASSETS>                              114,321,456
<DIVIDEND-INCOME>                                   0
<INTEREST-INCOME>                           1,708,363
<OTHER-INCOME>                                      0
<EXPENSES-NET>                                238,388
<NET-INVESTMENT-INCOME>                     1,469,975
<REALIZED-GAINS-CURRENT>                        1,269
<APPREC-INCREASE-CURRENT>                           0
<NET-CHANGE-FROM-OPS>                       1,471,244
<EQUALIZATION>                                      0
<DISTRIBUTIONS-OF-INCOME>                   1,469,975
<DISTRIBUTIONS-OF-GAINS>                            0
<DISTRIBUTIONS-OTHER>                               0
<NUMBER-OF-SHARES-SOLD>                   285,700,675
<NUMBER-OF-SHARES-REDEEMED>               171,380,488
<SHARES-REINVESTED>                                 0
<NET-CHANGE-IN-ASSETS>                    114,320,187
<ACCUMULATED-NII-PRIOR>                             0
<ACCUMULATED-GAINS-PRIOR>                           0
<OVERDISTRIB-NII-PRIOR>                             0
<OVERDIST-NET-GAINS-PRIOR>                          0
<GROSS-ADVISORY-FEES>                               0
<INTEREST-EXPENSE>                                  0
<GROSS-EXPENSE>                               238,388
<AVERAGE-NET-ASSETS>                       68,047,734
<PER-SHARE-NAV-BEGIN>                            1.00
<PER-SHARE-NII>                                  0.02
<PER-SHARE-GAIN-APPREC>                          0.00
<PER-SHARE-DIVIDEND>                            (0.02)
<PER-SHARE-DISTRIBUTIONS>                        0.00
<RETURNS-OF-CAPITAL>                                0
<PER-SHARE-NAV-END>                              1.00
<EXPENSE-RATIO>                                  0.67
<AVG-DEBT-OUTSTANDING>                              0
<AVG-DEBT-PER-SHARE>                             0.00
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information
extracted from Merrimac Series,
form N-SAR for the period ended December 31, 1998
and is qualified in its entirety by reference to
such financial statements.
</LEGEND>
<SERIES>
   <NUMBER> 7
   <NAME>   Merrimac STAR Series Premium Class
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                         DEC-31-1998
<PERIOD-END>                              DEC-31-1998
<INVESTMENTS-AT-COST>                       1,015,161
<INVESTMENTS-AT-VALUE>                      1,015,161
<RECEIVABLES>                                   9,912
<ASSETS-OTHER>                                      0
<OTHER-ITEMS-ASSETS>                            4,910
<TOTAL-ASSETS>                              1,029,983
<PAYABLE-FOR-SECURITIES>                            0
<SENIOR-LONG-TERM-DEBT>                             0
<OTHER-ITEMS-LIABILITIES>                      22,096
<TOTAL-LIABILITIES>                            22,096
<SENIOR-EQUITY>                                     0
<PAID-IN-CAPITAL-COMMON>                    1,007,780
<SHARES-COMMON-STOCK>                         101,107
<SHARES-COMMON-PRIOR>                               0
<ACCUMULATED-NII-CURRENT>                           0
<OVERDISTRIBUTION-NII>                              0
<ACCUMULATED-NET-GAINS>                         3,822
<OVERDISTRIBUTION-GAINS>                            0
<ACCUM-APPREC-OR-DEPREC>                       (3,715)
<NET-ASSETS>                                1,007,887
<DIVIDEND-INCOME>                                   0
<INTEREST-INCOME>                             130,868
<OTHER-INCOME>                                      0
<EXPENSES-NET>                                  7,643
<NET-INVESTMENT-INCOME>                       123,225
<REALIZED-GAINS-CURRENT>                        3,822
<APPREC-INCREASE-CURRENT>                      (3,715)
<NET-CHANGE-FROM-OPS>                         123,332
<EQUALIZATION>                                      0
<DISTRIBUTIONS-OF-INCOME>                     123,225
<DISTRIBUTIONS-OF-GAINS>                            0
<DISTRIBUTIONS-OTHER>                               0
<NUMBER-OF-SHARES-SOLD>                     1,401,014
<NUMBER-OF-SHARES-REDEEMED>                 1,310,686
<SHARES-REINVESTED>                            10,779
<NET-CHANGE-IN-ASSETS>                      1,007,780
<ACCUMULATED-NII-PRIOR>                             0
<ACCUMULATED-GAINS-PRIOR>                           0
<OVERDISTRIB-NII-PRIOR>                             0
<OVERDIST-NET-GAINS-PRIOR>                          0
<GROSS-ADVISORY-FEES>                               0
<INTEREST-EXPENSE>                                  0
<GROSS-EXPENSE>                                17,979
<AVERAGE-NET-ASSETS>                                0
<PER-SHARE-NAV-BEGIN>                           10.00
<PER-SHARE-NII>                                  0.24
<PER-SHARE-GAIN-APPREC>                         (0.03)
<PER-SHARE-DIVIDEND>                            (0.24)
<PER-SHARE-DISTRIBUTIONS>                        0.00
<RETURNS-OF-CAPITAL>                                0
<PER-SHARE-NAV-END>                              9.97
<EXPENSE-RATIO>                                  0.36
<AVG-DEBT-OUTSTANDING>                              0
<AVG-DEBT-PER-SHARE>                             0.00
        

</TABLE>

                Report of Ernst & Young LLP, Independent Auditors



To the Board of Trustees and
Shareholders of Merrimac Series


In planning and performing our audit of the financial statements of the Merrimac
Cash Series,  the Merrimac  Treasury  Series,  and the Short-Term  Asset Reserve
Series  (collectively,  the "Series"),  the three series comprising the Merrimac
Series (the "Trust") for the period ended  December 31, 1998, we considered  its
internal control,  including control activities for safeguarding securities,  in
order to determine our auditing  procedures  for the purpose of  expressing  our
opinion on the financial  statements and to comply with the requirements of Form
N-SAR, and not to provide assurance on the internal control.

The  management of the Trust is responsible  for  establishing  and  maintaining
internal control. In fulfilling this responsibility,  estimates and judgments by
management  are  required to assess the expected  benefits and related  costs of
controls.  Generally,  controls  that are  relevant  to an audit  pertain to the
entity's objective of preparing financial  statements for external purposes that
are  fairly   presented  in  conformity  with  generally   accepted   accounting
principles.   Those  controls   include  the   safeguarding  of  assets  against
unauthorized acquisition, use or disposition.

Because of inherent  limitations in internal control,  errors or fraud may occur
and not be detected.  Also,  projection of any evaluation of internal control to
future periods is subject to the risk that it may become  inadequate  because of
changes in conditions or that the  effectiveness of the design and operation may
deteriorate.

Our consideration of internal control would not necessarily disclose all matters
in  internal   control  that  might  be  material   weaknesses  under  standards
established  by the  American  Institute  of  Certified  Public  Accountants.  A
material weakness is a condition in which the design or operation of one or more
of specific  internal  control  components  does not reduce to a relatively  low
level the risk  that  errors  or fraud in  amounts  that  would be  material  in
relation to the financial statements being audited may occur and not be detected
within a timely  period by employees in the normal  course of  performing  their
assigned functions.  However, we noted no matters involving internal control and
its operation,  including controls for safeguarding securities, that we consider
to be material weaknesses as defined above at December 31, 1998.

This  report is  intended  solely  for the  information  and use of the board of
trustees and management of the Trust and the Securities and Exchange  Commission
and is not  intended  to be and  should  not be used by anyone  other than these
specified parties.




Boston, Massachusetts
February 12, 1999



14
L:\MFADMIN\MERRIMAC\BOARD\981026\INVEST.DOC
                                              Merrimac Master Portfolio
 ("Master Trust")
                                                   Merrimac Funds
 ("Feeder Trust 1")
                                                  Merrimac Series
 ("Feeder Trust 2")
                                                  Combined Board of Trustees
 Meeting
                                                           October 26, 1998

APPROVAL OF CHANGE TO INVESTMENT POLICIES

Master/Feeder Trust 1 & 2


         WHEREAS,  the  non-fundamental  investment  policies  of  the  Merrimac
         Treasury Portfolio, (the "Portfolio"),  a series of the Merrimac Master
         Portfolio,  the  Merrimac  Treasury  Fund  (the  "Fund"),  a series  of
         Merrimac Funds,  and the Merrimac  Treasury  Series (the  "Series"),  a
         series of Merrimac  Series,  represent  the current  intentions  of the
         Board of Trustees and of the Portfolio, the Fund and the Series; and

         WHEREAS,  non-fundamental investment policies may be changed or amended
         by the Board of Trustees of the  Merrimac  Master  Portfolio,  Merrimac
         Funds and  Merrimac  Series  without  prior  notice to or  approval  by
         shareholders; it is hereby

         RESOLVED, that the changes to the investment policies of the Portfolio,
         the Fund and the Series,  as reflected in the  Prospectus and Statement
         of Additional  Information for the Series  presented to the Trustees at
         the Meeting be, and they hereby are, approved.




4

                                OTHER INFORMATION

SHAREHOLDER VOTING RESULTS:  (Unaudited)

A special  meeting of the Merrimac Cash Series  shareholders  was held on August
28, 1998 at which shareholders  considered one proposal. The voting results were
as follows:

To approve a new Investment Sub-Adviser Agreement between Investors Bank & Trust
Company  (the   "Adviser")   and   Allmerica   Asset   Management,   Inc.   (the
"Sub-Adviser"),  with respect to the assets of the Merrimac  Cash  Portfolio,  a
series of the Merrimac Master Portfolio:

<TABLE>
<S>       <C>                 <C>                 <C>    

          Shares For          Shares Against      Shares Abstaining
          
          0                   0                   207,059,045
</TABLE>




A special  meeting of the  Merrimac  Treasury  Series  shareholders  was held on
December 18, 1998 at which  shareholders  considered  one  proposal.  The voting
results were as follows:

To approve a new Investment Sub-Adviser Agreement between Investors Bank & Trust
Company (the "Adviser") and M&I Investment Management Corp. (the "Sub-Adviser"),
with respect to the assets of the Merrimac Treasury  Portfolio,  a series of the
Merrimac Master Portfolio:

<TABLE>
<S>       <C>                 <C>                 <C>    

                              Shares Against      Shares Abstaining
          Shares For
          83,125,905          0                   0
</TABLE>






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