<PAGE>
000 A000000 04/30/98
000 C000000 0001040078
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 U.S. MID-CAP PORTFOLIO
001 B000000 811-08233
001 C000000 3459494719
002 A000000 BUTTERFIELD HOUSE, FORT STREET, BOX 2330
002 B000000 GEORGE TOWN
002 E010000 CAYMAN ISLANDS, BWI
003 000000 Y
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
008 A000001 BROWN BROTHERS HARRIMAN & CO
008 B000001 A
008 C000001 801-000000
008 D010001 NEW YORK
008 D020001 NY
008 D030001 10005
010 A000001 BROWN BROTHERS HARRIMAN TRUST CO (CAYMAN) LTD
010 C010001 GEORGE TOWN
010 C050001 CAYMAN ISLANDS, BWI
013 A000001 DELOITTE & TOUCHE LLP
013 B010001 GEORGE TOWN
013 B050001 CAYMAN ISLANDS, BWI
015 A000001 STATE STREET BANK & TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02101
015 E010001 X
018 000000 Y
019 A000000 N
019 B000000 0
020 A000001 BROWN BROTHERS HARRIMAN
020 C000001 20
020 A000002 BERNSTEIN SANFORD
020 B000002 13-2625874
020 C000002 3
020 A000003 LEWCO SECURITIES
020 B000003 13-2765944
020 C000003 2
020 A000004 AUTRANET
<PAGE>
020 B000004 13-2961507
020 C000004 2
020 A000005 CS FIRST BOSTON
020 B000005 13-5659485
020 C000005 1
020 A000006 CIBC OPPENHEIMER
020 B000006 13-2798343
020 C000006 1
020 A000007 WHEAT FIRST
020 B000007 54-0796506
020 C000007 1
020 C000008 0
020 C000009 0
020 C000010 0
021 000000 29
022 A000001 BROWN BROTHERS HARRIMAN
022 C000001 5740
022 D000001 5453
022 A000002 BERNSTEIN SANFORD
022 B000002 13-2625874
022 C000002 549
022 D000002 350
022 A000003 LEWCO
022 B000003 13-2765944
022 C000003 755
022 D000003 110
022 A000004 AUTRANET
022 B000004 13-2961507
022 C000004 758
022 D000004 0
022 A000005 CS FIRST BOSTON
022 B000005 13-5659485
022 C000005 252
022 D000005 0
022 A000006 MORGAN STANLEY
022 B000006 13-2655998
022 C000006 78
022 D000006 137
022 A000007 CIBC OPPENHEIMER
022 C000007 147
022 D000007 0
022 A000008 GOLDMAN SACHS
022 C000008 141
022 D000008 0
022 A000009 WHEAT FIRST
022 C000009 98
022 D000009 0
022 C000010 0
022 D000010 0
023 C000000 8518
023 D000000 6050
<PAGE>
024 000000 N
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027 000000 Y
028 A010000 7487
028 A020000 0
028 A030000 0
028 A040000 1
028 B010000 21
028 B020000 0
028 B030000 0
028 B040000 12
028 C010000 516
028 C020000 0
028 C030000 0
028 C040000 2
028 D010000 1291
028 D020000 0
028 D030000 0
028 D040000 15
028 E010000 495
028 E020000 0
028 E030000 0
028 E040000 2
028 F010000 318
028 F020000 0
028 F030000 0
028 F040000 8
028 G010000 10128
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028 G030000 0
028 G040000 40
028 H000000 0
029 000000 N
030 A000000 0
030 B000000 0.00
030 C000000 0.00
034 000000 N
035 000000 0
036 B000000 0
037 000000 N
038 000000 0
039 000000 N
040 000000 N
<PAGE>
041 000000 N
042 A000000 0
042 B000000 0
042 C000000 0
042 D000000 0
042 E000000 0
042 F000000 0
042 G000000 0
042 H000000 0
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045 000000 Y
046 000000 N
047 000000 Y
048 000000 0.650
048 A010000 0
048 A020000 0.000
048 B010000 0
048 B020000 0.000
048 C010000 0
048 C020000 0.000
048 D010000 0
048 D020000 0.000
048 E010000 0
048 E020000 0.000
048 F010000 0
048 F020000 0.000
048 G010000 0
048 G020000 0.000
048 H010000 0
048 H020000 0.000
048 I010000 0
048 I020000 0.000
048 J010000 0
048 J020000 0.000
048 K010000 0
048 K020000 0.000
049 000000 N
050 000000 N
051 000000 N
052 000000 Y
053 A000000 N
054 A000000 Y
054 B000000 Y
054 C000000 Y
054 D000000 N
054 E000000 N
054 F000000 Y
054 G000000 N
054 H000000 N
054 I000000 N
<PAGE>
054 J000000 Y
054 K000000 N
054 L000000 N
054 M000000 Y
054 N000000 N
054 O000000 Y
055 A000000 N
055 B000000 N
056 000000 Y
057 000000 N
058 A000000 N
059 000000 Y
060 A000000 Y
060 B000000 Y
061 000000 0
062 A000000 N
062 B000000 0.0
062 C000000 0.0
062 D000000 0.0
062 E000000 0.0
062 F000000 0.0
062 G000000 0.0
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062 I000000 0.0
062 J000000 0.0
062 K000000 0.0
062 L000000 0.0
062 M000000 0.0
062 N000000 0.0
062 O000000 0.0
062 P000000 0.0
062 Q000000 0.0
062 R000000 0.0
066 A000000 Y
066 B000000 N
066 C000000 N
066 D000000 N
066 E000000 N
066 F000000 N
066 G000000 Y
067 000000 N
068 A000000 N
068 B000000 Y
069 000000 N
070 A010000 Y
070 A020000 N
070 B010000 Y
070 B020000 N
070 C010000 N
070 C020000 N
070 D010000 Y
<PAGE>
070 D020000 N
070 E010000 N
070 E020000 N
070 F010000 Y
070 F020000 N
070 G010000 N
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 N
070 K010000 Y
070 K020000 N
070 L010000 Y
070 L020000 Y
070 M010000 Y
070 M020000 Y
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000 15810
071 B000000 7834
071 C000000 6290
071 D000000 50
072 A000000 6
072 B000000 5
072 C000000 52
072 D000000 0
072 E000000 0
072 F000000 28
072 G000000 2
072 H000000 0
072 I000000 0
072 J000000 0
072 K000000 0
072 L000000 0
072 M000000 0
072 N000000 0
072 O000000 0
072 P000000 0
072 Q000000 0
072 R000000 0
<PAGE>
072 S000000 0
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 5
072 X000000 35
072 Y000000 0
072 Z000000 22
072AA000000 951
072BB000000 0
072CC010000 262
072CC020000 0
072DD010000 0
072DD020000 0
072EE000000 0
073 A010000 0.0000
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 2575
074 B000000 0
074 C000000 0
074 D000000 0
074 E000000 0
074 F000000 9751
074 G000000 0
074 H000000 0
074 I000000 0
074 J000000 15
074 K000000 0
074 L000000 15
074 M000000 0
074 N000000 12356
074 O000000 1215
074 P000000 0
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 17
074 S000000 0
074 T000000 11124
074 U010000 0
074 U020000 0
074 V010000 0.00
074 V020000 0.00
074 W000000 0.0000
074 X000000 2
074 Y000000 0
075 A000000 0
075 B000000 6804
<PAGE>
076 000000 0.00
077 A000000 Y
077 B000000 Y
080 A000000 FEDERAL INSURANCE
080 C000000 4300
081 A000000 Y
081 B000000 10
082 A000000 N
082 B000000 0
083 A000000 N
083 B000000 0
084 A000000 N
084 B000000 0
085 A000000 Y
085 B000000 N
SIGNATURE SUSAN JAKUBOSKI
TITLE ASSISTANT TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information extracted from the Emerging
Markets Portfolio Semi-Annual Report dated April 30, 1998, and is qualified in
its entirety by reference to such report.
</LEGEND>
<CIK> 0001047718
<NAME> US MID CAP PORTFOLIO
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 9,489,113
<INVESTMENTS-AT-VALUE> 9,751,029
<RECEIVABLES> 29,803
<ASSETS-OTHER> 2,575,025
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 12,355,857
<PAYABLE-FOR-SECURITIES> 1,214,815
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 17,282
<TOTAL-LIABILITIES> 1,232,097
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 10,861,839
<SHARES-COMMON-STOCK> 0
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 261,921
<NET-ASSETS> 11,123,760
<DIVIDEND-INCOME> 51,471
<INTEREST-INCOME> 5,156
<OTHER-INCOME> 0
<EXPENSES-NET> 34,872
<NET-INVESTMENT-INCOME> 21,755
<REALIZED-GAINS-CURRENT> 951,253
<APPREC-INCREASE-CURRENT> 261,921
<NET-CHANGE-FROM-OPS> 1,234,929
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 11,123,760
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 28,333
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 34,872
<AVERAGE-NET-ASSETS> 8,790,086
<PER-SHARE-NAV-BEGIN> 0
<PER-SHARE-NII> 0
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 0
<EXPENSE-RATIO> 0.80
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
