PRUDENTIAL INDEX SERIES FUND
NSAR-A, 1998-06-01
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<PAGE>      PAGE  1
000 A000000 03/31/98
000 C000000 0000887991
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 PRUDENTIAL INDEX SERIES FUND
001 B000000 811-6677
001 C000000 9733677530
002 A000000 100 MULBERRY STREET, GTWY CTR 3, 9TH FL.
002 B000000 NEWARK
002 C000000 NJ
002 D010000 07102
002 D020000 4077
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  5
007 C010100  1
007 C020100 PRUDENTIAL STOCK INDEX FUND
007 C030100 N
007 C010200  2
007 C010300  3
007 C020300 PRUDENTIAL EUROPE INDEX FUND
007 C030300 N
007 C010400  4
007 C020400 PRUDENTIAL PACIFIC INDEX FUND
007 C030400 N
007 C010500  5
007 C020500 PRUDENTIAL BOND MARKET INDEX FUND
007 C030500 N
007 C010600  6
007 C020600 PRUDENTIAL SMALL CAP INDEX FUND
007 C030600 N
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
008 A00AA01 THE PRUDENTIAL INVESTMENT CORPORATION
008 B00AA01 S
008 C00AA01 801-12484
008 D01AA01 NEWARK
008 D02AA01 NJ
008 D03AA01 07102
008 D04AA01 3777
008 A00AA04 PRUDENTIAL INVESTMENTS FUND MANAGEMENT LLC.
<PAGE>      PAGE  2
008 B00AA04 A
008 C00AA04 801-12484
008 D01AA04 NEWARK
008 D02AA04 NJ
008 D03AA04 07102
008 D04AA04 3777
011 A00AA01 PRUDENTIAL SECURITIES INCORPORATED
011 B00AA01 8-27154
011 C01AA01 NEW YORK
011 C02AA01 NY
011 C03AA01 10292
012 A00AA01 PRUDENTIAL MUTUAL FUND SERVICES LLC
012 B00AA01 84-5681
012 C01AA01 NEW BRUNSWICK
012 C02AA01 NJ
012 C03AA01 08906
012 C04AA01 5005
013 A00AA01 PRICE WATERHOUSE LLP
013 B01AA01 NEW YORK
013 B02AA01 NY
013 B03AA01 10036
014 A00AA01 PRUDENTIAL SECURITIES INCORPORATED
014 B00AA01 8-27154
014 A00AA02 PRUCO SECURITIES CORPORATION
014 B00AA02 8-16402
015 A00AA01 CITIBANK, N.A.
015 B00AA01 S
015 C01AA01 BUENOS AIRES
015 D01AA01 ARGENTINA
015 E04AA01 X
015 A00AA02 WESTPAC BANKING CORPORATION
015 B00AA02 S
015 C01AA02 SYDNEY
015 D01AA02 AUSTRALIA
015 E04AA02 X
015 A00AA03 GIROCREDIT BANK AKTIENGESELLSCHAFT DER SPARKS
015 B00AA03 S
015 C01AA03 VIENNA
015 D01AA03 AUSTRIA
015 E04AA03 X
015 A00AA04 STATE STREET BANK
015 B00AA04 C
015 C01AA04 BOSTON
015 D01AA04 UNTIED STATES
015 E01AA04 X
015 A00AA05 GENERALE BANK
015 B00AA05 S
015 C01AA05 BRUSSELS
015 D01AA05 BELGIUM
015 E04AA05 X
015 A00AA06 CITIBANK, N.A.
<PAGE>      PAGE  3
015 B00AA06 S
015 C01AA06 SAO PAOLO
015 D01AA06 BRAZIL
015 E04AA06 X
015 A00AA07 CANADA TRUSTCO MORTGAGE COMPANY
015 B00AA07 S
015 C01AA07 TORONTO
015 D01AA07 CANADA
015 E04AA07 X
015 A00AA08 CITIBANK, N.A.
015 B00AA08 S
015 C01AA08 SANTIAGO
015 D01AA08 CHILE
015 E04AA08 X
015 A00AA09 HONGKONG AND SHANGHAI BANKING CORP.
015 B00AA09 S
015 C01AA09 SHANGHAI
015 D01AA09 CHINA
015 E04AA09 X
015 A00AA10 CITITRUST COLUMBIA S.A.
015 B00AA10 S
015 C01AA10 BOGATA
015 D01AA10 COLUMBIA
015 E04AA10 X
015 A00AA12 CESKOSLOVENSKA OBCHODNI
015 B00AA12 S
015 C01AA12 PRAGUE
015 D01AA12 CZECH REPUBLIC
015 E04AA12 X
015 A00AA13 DEN DANSKE BANK
015 B00AA13 S
015 C01AA13 OPENHAGEN
015 D01AA13 DENMARK
015 E04AA13 X
015 A00AA14 CITIBANK, N.A.
015 B00AA14 S
015 C01AA14 QUITO
015 D01AA14 ECUADOR
015 E04AA14 X
015 A00AA15 BANQUE PARIBAS
015 B00AA15 S
015 C01AA15 PARIS
015 D01AA15 FRANCE
015 E04AA15 X
015 A00AA16 MERITA BANK LIMITED
015 B00AA16 S
015 C01AA16 HELSMBI
015 D01AA16 FINLAND
015 E04AA16 X
015 A00AA17 DRESDNER BANK AG
015 B00AA17 S
<PAGE>      PAGE  4
015 C01AA17 FRANKFURT
015 D01AA17 GERMANY
015 E04AA17 X
015 A00AA18 BARCLAYS BANK OF GHANA LIMITED
015 B00AA18 S
015 C01AA18 ACCRA
015 D01AA18 GHANA
015 E04AA18 X
015 A00AA19 NATIONAL BANK OF GREECE S.A.
015 B00AA19 S
015 C01AA19 ATHENS
015 D01AA19 GREECE
015 E04AA19 X
015 A00AA20 STANDARD CHARTERED BANK
015 B00AA20 S
015 C01AA20 HONG KONG
015 D01AA20 HONG KONG
015 E04AA20 X
015 A00AA21 CITIBANK BUDAPEST RT.
015 B00AA21 S
015 C01AA21 BUDAPEST
015 D01AA21 HUNGARY
015 E04AA21 X
015 A00AA22 HONGKONG AND SHANGHAI BANKING CORP,. LTD.
015 B00AA22 S
015 C01AA22 MUMBAI
015 D01AA22 INDIA
015 E04AA22 X
015 A00AA23 DEUTSCHE BANK AG
015 B00AA23 S
015 C01AA23 MUMBAI
015 D01AA23 INDIA
015 E04AA23 X
015 A00AA24 STANDARD CHARTERED BANK
015 B00AA24 S
015 C01AA24 JAKARTA
015 D01AA24 INDONESIA
015 E04AA24 X
015 A00AA25 BANK OF IRELAND
015 B00AA25 S
015 C01AA25 DUBLIN
015 D01AA25 IRELAND
015 E04AA25 X
015 A00AA26 BANK HAPOALIM B.M.
015 B00AA26 S
015 C01AA26 TEL AVIV
015 D01AA26 ISRAEL
015 E04AA26 X
015 A00AA27 BANQUE PARIBAS
015 B00AA27 S
015 C01AA27 MILAN
<PAGE>      PAGE  5
015 D01AA27 ITALY
015 E04AA27 X
015 A00AA28 SOCIETE GENERALE DE BANQUES
015 B00AA28 S
015 C01AA28 ABIDJAN
015 D01AA28 IVORY COAST
015 E04AA28 X
015 A00AA29 DIAWA BANK, LTD.
015 B00AA29 S
015 C01AA29 TOKYO
015 D01AA29 JAPAN
015 E04AA29 X
015 A00AA30 SUMITOMO TRUST & BANKING
015 B00AA30 S
015 C01AA30 TOKYO
015 D01AA30 JAPAN
015 E04AA30 X
015 A00AA31 FUJI BANK, LTD.
015 B00AA31 S
015 C01AA31 TOKYO
015 D01AA31 JAPAN
015 E04AA31 X
015 A00AA32 BRITISH BANK OF THE MIDDLE EAST
015 B00AA32 S
015 C01AA32 AMMAN
015 D01AA32 JORDAN
015 E04AA32 X
015 A00AA33 BARCLAYS BANK OF KENYA LTD.
015 B00AA33 S
015 C01AA33 NAIROBI
015 D01AA33 KENYA
015 E04AA33 X
015 A00AA34 SEOUL BANK
015 B00AA34 S
015 C01AA34 SEOUL
015 D01AA34 KOREA
015 E04AA34 X
015 A00AA35 BRITISH BANK OF THE MIDDLE EAST
015 B00AA35 S
015 C01AA35 BEIRUT
015 D01AA35 LEBANON
015 E04AA35 X
015 A00AA36 STANDARD CHARTERED BANK
015 B00AA36 S
015 C01AA36 KUALA LUMPUR
015 D01AA36 MALAYSIA
015 E04AA36 X
015 A00AA37 CITIBANK MEXICO, S.A.
015 B00AA37 S
015 C01AA37 MEXICO CITY
015 D01AA37 MEXICO
<PAGE>      PAGE  6
015 E04AA37 X
015 A00AA38 BANQUE COMMERCIALE DU MAROC
015 B00AA38 S
015 C01AA38 CASABLANCA
015 D01AA38 MOROCCO
015 E04AA38 X
015 A00AA39 MEESPIERSON N.V.
015 B00AA39 S
015 C01AA39 AMSTERDAM
015 D01AA39 NETHERLANDS
015 E04AA39 X
015 A00AA40 ANZ BANKING GROUP LTD.
015 B00AA40 S
015 C01AA40 WELLINGTON
015 D01AA40 NEW ZEALAND
015 E04AA40 X
015 A00AA41 CHRISTIANIA BANK OG KREDITKASSE
015 B00AA41 S
015 C01AA41 OSLO
015 D01AA41 NORWAY
015 E04AA41 X
015 A00AA42 DEUTSCHE BANK AG
015 B00AA42 S
015 C01AA42 KARACHI
015 D01AA42 PAKISTAN
015 E04AA42 X
015 A00AA43 CITIBANK, N.A.
015 B00AA43 S
015 C01AA43 LIMA
015 D01AA43 PERU
015 E04AA43 X
015 A00AA44 STANDARD CHARACTERED BANK
015 B00AA44 S
015 C01AA44 MANILA
015 D01AA44 PHILIPPINES
015 E04AA44 X
015 A00AA45 CITIBANK POLAND, S.A.
015 B00AA45 S
015 C01AA45 WARSAW
015 D01AA45 POLAND
015 E04AA45 X
015 A00AA46 BANCO COMERCIAL PORTUGUESE
015 B00AA46 S
015 C01AA46 LISBON
015 D01AA46 PORTUGAL
015 E04AA46 X
015 A00AA47 CREDIT SUISSE FIRST BOSTON
015 B00AA47 S
015 C01AA47 MOSCOW
015 D01AA47 RUSSIA
015 E04AA47 X
<PAGE>      PAGE  7
015 A00AA48 DEVELOPMENT BANK OF SINGAPORE LTD.
015 B00AA48 S
015 C01AA48 SINGAPORE
015 D01AA48 SINGAPORE
015 E04AA48 X
015 A00AA49 CEKOSLOVENSKA OBCHODNA
015 B00AA49 S
015 C01AA49 BRATISLAVA
015 D01AA49 SLOVAK REPUBLIC
015 E04AA49 X
015 A00AA50 STANDARD BANK OF SOUTH AFRICA LTD.
015 B00AA50 S
015 C01AA50 JOHANNESBURG
015 D01AA50 SOUTH AFRICA
015 E04AA50 X
015 A00AA51 BANCO SANTANDER, S.A.
015 B00AA51 S
015 C01AA51 MADRID
015 D01AA51 SPAIN
015 E04AA51 X
015 A00AA52 HONGKONG AND SHANGHAI BANKING CORP. LTD.
015 B00AA52 S
015 C01AA52 COLOMBO
015 D01AA52 SRI LANKA
015 E04AA52 X
015 A00AA53 SKANDINAVISKA ENSKILDA BANKEN
015 B00AA53 S
015 C01AA53 STOCKHOLM
015 D01AA53 SWEDEN
015 E04AA53 X
015 A00AA54 UNION BANK OF SWITZERLAND
015 B00AA54 S
015 C01AA54 ZURICH
015 D01AA54 SWITZERLAND
015 E04AA54 X
015 A00AA55 CENTRAL TRUST OF CHINA
015 B00AA55 S
015 C01AA55 TAIPEI
015 D01AA55 TAIWAN
015 E04AA55 X
015 A00AA56 STANDARD CHARTERED BANK
015 B00AA56 S
015 C01AA56 BANGKOK
015 D01AA56 THAILAND
015 E04AA56 X
015 A00AA57 CITIBANK, N.A.
015 B00AA57 S
015 C01AA57 ISTANBUL
015 D01AA57 TURKEY
015 E04AA57 X
015 A00AA58 STATE STREET BANK AND TRUST COMPANY
<PAGE>      PAGE  8
015 B00AA58 S
015 C01AA58 LONDON
015 D01AA58 UNITED KINGDOM
015 E04AA58 X
015 A00AA59 CITIBANK, N.A.
015 B00AA59 S
015 C01AA59 MONTEVIDEO
015 D01AA59 URUGUAY
015 E04AA59 X
015 A00AA60 CITIBANK, N.A.
015 B00AA60 S
015 C01AA60 CARACAS
015 D01AA60 VENEZUELA
015 E04AA60 X
015 B00AA61 S
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   94
019 C00AA00 PRUDENTIAL
020 A000001 PAINEWEBBER INCORPORATED
020 B000001 13-2638166
020 C000001  84924
020 A000002 BARCLAYS BANK PLC
020 B000002 13-3082694
020 C000002     12
020 A000003 WEISS PECK AND GREER
020 B000003 13-2649199
020 C000003      8
020 A000004 MORGAN STANLEY DEAN WITTER, DISCOVER & CO.
020 B000004 13-3082694
020 C000004      7
020 A000005 INSTINET CORP.
020 B000005 13-2518466
020 C000005      3
020 A000006 BZW SECURITIES INC.
020 B000006 13-2638130
020 C000006      2
020 A000007 CHICAGO CORPORATION
020 B000007 13-3299429
020 C000007      1
020 A000008 BARCLAYS DE ZOETE WEDD SECURITIES
020 B000008 13-2154681
020 C000008      0
020 A000009 MORGAN GUARANTY TRUST CO.
020 B000009 13-5108805
020 C000009      0
020 A000010 GENERAL BANK BRUSSELS
020 B000010 13-5674085
020 C000010      0
021  000000   117812
022 A000001 BEAR, STEARNS SECURITIES CORP.
<PAGE>      PAGE  9
022 B000001 13-3299429
022 C000001   1254996
022 D000001         0
022 A000002 CREDIT UNION FIRST BOSTON CORP.
022 B000002 13-5659485
022 C000002    759321
022 D000002      1107
022 A000003 SALOMON BROTHERS INC.
022 B000003 13-5588800
022 C000003    738331
022 D000003     17897
022 A000004 SBC WARBURG INC.
022 B000004 13-3340045
022 C000004    577071
022 D000004         0
022 A000005 DEUTSCHE BANK SECURITIES CORP.
022 B000005 13-1912900
022 C000005    502323
022 D000005       551
022 A000006 GOLDMAN SACHS & CO.
022 B000006 13-5108880
022 C000006    333372
022 D000006      1524
022 A000007 J.P. MORGAN SECURITIES INC.
022 B000007 13-5548632
022 C000007    300606
022 D000007      6535
022 A000008 UBS SECURITIES LLC
022 B000008 13-3873456
022 C000008    145011
022 D000008       421
022 A000009 LEHMAN BROS. INC.
022 B000009 13-2655998
022 C000009    131395
022 D000009      5276
022 A000010 MORGAN STANLEY AND CO, INC.
022 B000010 13-6695847
022 C000010     68043
022 D000010      1317
023 C000000    5004431
023 D000000      75832
024  00AA00 Y
026 A000000 N
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026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
<PAGE>      PAGE  10
027  000000 Y
029  00AA00 N
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054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
054 G00AA00 N
054 H00AA00 Y
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054 J00AA00 Y
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054 M00AA00 N
054 N00AA00 N
054 O00AA00 N
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<PAGE>      PAGE  11
060 B00AA00 Y
061  00AA00        0
077 A000000 Y
077 B000000 N
077 C000000 N
077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
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077 K000000 N
077 L000000 N
077 M000000 N
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077 Q010000 Y
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078  000000 N
025 A000101 CREDIT SUISSE FIRST BOSTON CORP.
025 B000101 13-5659485
025 C000101 D
025 D000101   11640
025 A000102 SALOMON SMITH BARNEY
025 B000102 13-1912900
025 C000102 D
025 D000102   11640
025 A000103 SBC WARBURG DILLON INC.
025 B000103 13-3340045
025 C000103 D
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025 B000104 13-2932996
025 C000104 D
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025 A000105 UBS SECURITIES LLC
025 B000105 13-3873456
025 C000105 D
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<PAGE>      PAGE  12
028 B030100         0
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045  000100 Y
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055 A000100 N
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<PAGE>      PAGE  13
056  000100 N
057  000100 N
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<PAGE>      PAGE  14
070 J010100 Y
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<PAGE>      PAGE  15
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<PAGE>      PAGE  16
062 K000200   0.0
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025 A000301 CREDIT SUISSE FIRST BOSTON CORP.
<PAGE>      PAGE  17
025 B000301 13-5659485
025 C000301 D
025 D000301       8
025 A000302 SALOMON SMITH BARNEY
025 B000302 13-1912900
025 C000302 D
025 D000302       8
025 A000303 SBC WARBURG, DILLON READ INC.UBS SECURITIES
025 B000303 13-3340045
025 C000303 D
025 D000303       5
025 A000304 UBS SECURITIES INC.
025 B000304 13-3873456
025 C000304 D
025 D000304       2
025 A000305 MORGAN STANLEY, DEAN WITTER, DISCOVER & CO.
025 B000305 13-3256865
025 C000305 D
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025 D000307       0
025 D000308       0
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028 A040300         0
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028 B030300         0
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028 D030300         0
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028 F030300         0
028 F040300        77
028 G010300     15897
028 G020300       108
028 G030300         0
028 G040300       263
028 H000300         0
<PAGE>      PAGE  18
045  000300 Y
046  000300 N
047  000300 Y
048  000300  0.400
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048 A020300 0.000
048 B010300        0
048 B020300 0.000
048 C010300        0
048 C020300 0.000
048 D010300        0
048 D020300 0.000
048 E010300        0
048 E020300 0.000
048 F010300        0
048 F020300 0.000
048 G010300        0
048 G020300 0.000
048 H010300        0
048 H020300 0.000
048 I010300        0
048 I020300 0.000
048 J010300        0
048 J020300 0.000
048 K010300        0
048 K020300 0.000
055 A000300 N
055 B000300 N
056  000300 N
057  000300 N
062 A000300 N
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   0.0
062 M000300   0.0
062 N000300   0.0
062 O000300   0.0
062 P000300   0.0
062 Q000300   0.0
062 R000300   0.0
066 A000300 Y
066 B000300 N
066 C000300 N
<PAGE>      PAGE  19
066 D000300 N
066 E000300 N
066 F000300 N
066 G000300 Y
067  000300 N
068 A000300 N
068 B000300 Y
069  000300 Y
070 A010300 Y
070 A020300 Y
070 B010300 Y
070 B020300 N
070 C010300 N
070 C020300 N
070 D010300 Y
070 D020300 N
070 E010300 N
070 E020300 N
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
070 J020300 N
070 K010300 N
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 Y
070 P020300 N
070 Q010300 N
070 Q020300 N
070 R010300 N
070 R020300 N
071 A000300     15910
071 B000300       411
071 C000300     15764
071 D000300    3
072 A000300  6
072 B000300       10
072 C000300      113
<PAGE>      PAGE  20
072 D000300        0
072 E000300        0
072 F000300       31
072 G000300        0
072 H000300        0
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074 N000300    18515
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<PAGE>      PAGE  21
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074 Y000300        0
075 A000300        0
075 B000300    15669
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025 A000401 CREDIT SUISSE FIRST BOSTON CORP.
025 B000401 13-5659485
025 C000401 D
025 D000401      11
025 A000402 SALOMON SMITH BARNEY INC.
025 B000402 13-1912900
025 C000402 D
025 D000402      11
025 A000403 SBC WARBURG, DILLION READ INC.
025 B000403 13-3340045
025 C000403 D
025 D000403       4
025 A000404 MORGAN STANLEY, DEAN WITTER, DISCOVER & CO.UB
025 B000404 13-3256865
025 C000404 D
025 D000404       4
025 A000405 UBS SECURITIES INC.
025 B000405 13-3873456
025 C000405 D
025 D000405       3
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025 D000407       0
025 D000408       0
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028 A030400         0
028 A040400         0
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<PAGE>      PAGE  22
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045  000400 Y
046  000400 N
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055 A000400 Y
055 B000400 N
056  000400 N
057  000400 N
062 A000400 N
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062 C000400   0.0
062 D000400   0.0
<PAGE>      PAGE  23
062 E000400   0.0
062 F000400   0.0
062 G000400   0.0
062 H000400   0.0
062 I000400   0.0
062 J000400   0.0
062 K000400   0.0
062 L000400   0.0
062 M000400   0.0
062 N000400   0.0
062 O000400   0.0
062 P000400   0.0
062 Q000400   0.0
062 R000400   0.0
066 A000400 Y
066 B000400 N
066 C000400 N
066 D000400 N
066 E000400 N
066 F000400 N
066 G000400 Y
067  000400 N
068 A000400 N
068 B000400 Y
069  000400 Y
070 A010400 Y
070 A020400 Y
070 B010400 Y
070 B020400 N
070 C010400 N
070 C020400 N
070 D010400 Y
070 D020400 N
070 E010400 N
070 E020400 N
070 F010400 Y
070 F020400 N
070 G010400 Y
070 G020400 N
070 H010400 Y
070 H020400 N
070 I010400 N
070 I020400 N
070 J010400 Y
070 J020400 N
070 K010400 N
070 K020400 N
070 L010400 Y
070 L020400 Y
070 M010400 Y
070 M020400 Y
<PAGE>      PAGE  24
070 N010400 Y
070 N020400 N
070 O010400 Y
070 O020400 N
070 P010400 Y
070 P020400 N
070 Q010400 N
070 Q020400 N
070 R010400 N
070 R020400 N
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<PAGE>      PAGE  25
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025 A000501 FIRST BOSTON CORP.
025 B000501 13-5659425
025 C000501 D
025 D000501    2472
025 A000502 SALOMON SMITH BARNEY INC.
025 B000502 13-5108880
025 C000502 D
025 D000502    2472
025 A000503 WARBERG, DILLON READ INC.
025 B000503 13-1912900
025 C000503 D
025 D000503    1676
025 A000504 UBS SECURITIES INC.
025 B000504 13-2932996
025 C000504 D
025 D000504     680
025 A000505 MORGAN STANLEY, DEAN WITTER, DISCOVER & CO.
025 B000505 13-3256865
<PAGE>      PAGE  26
025 C000505 D
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045  000500 Y
046  000500 N
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<PAGE>      PAGE  27
048 G020500 0.000
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048 I020500 0.000
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055 A000500 N
055 B000500 N
056  000500 N
057  000500 N
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062 C000500   0.0
062 D000500  24.7
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062 F000500   0.0
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062 H000500   0.0
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062 J000500   0.0
062 K000500   0.0
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062 M000500  45.8
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062 P000500  16.7
062 Q000500   5.6
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063 A000500   0
063 B000500  0.0
066 A000500 Y
066 B000500 N
066 C000500 N
066 D000500 N
066 E000500 N
066 F000500 N
066 G000500 Y
067  000500 N
068 A000500 N
068 B000500 N
069  000500 Y
070 A010500 Y
070 A020500 Y
070 B010500 N
070 B020500 N
070 C010500 Y
070 C020500 N
070 D010500 N
<PAGE>      PAGE  28
070 D020500 N
070 E010500 Y
070 E020500 N
070 F010500 N
070 F020500 N
070 G010500 Y
070 G020500 N
070 H010500 N
070 H020500 N
070 I010500 N
070 I020500 N
070 J010500 Y
070 J020500 N
070 K010500 N
070 K020500 N
070 L010500 N
070 L020500 Y
070 M010500 N
070 M020500 Y
070 N010500 Y
070 N020500 N
070 O010500 Y
070 O020500 Y
070 P010500 N
070 P020500 N
070 Q010500 N
070 Q020500 N
070 R010500 N
070 R020500 N
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<PAGE>      PAGE  29
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<PAGE>      PAGE  30
076  000500     0.00
025 A000601 CREDIT SUISSE FIRST BOSTON CORP.
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025 A000603 SALOMON SMITH BARNEY
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025 A000604 SBC WARBERG
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<PAGE>      PAGE  31
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<PAGE>      PAGE  32
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066 D000600 N
066 E000600 N
066 F000600 N
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070 J020600 N
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<PAGE>      PAGE  33
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074 K000600       16
074 L000600       35
074 M000600       14
074 N000600    25716
074 O000600       72
<PAGE>      PAGE  34
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076  000600     0.00
SIGNATURE   GRACE G. TORRES                              
TITLE       TREASURER           
 

WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>











<ARTICLE> 6
<CIK> 0000887991
<NAME> PRUDENTIAL INDEX SERIES FUND
<SERIES>
   <NUMBER> 004
   <NAME> BOND MARKET INDEX FUND (CLASS Z)
       
<S>                             <C>
<PERIOD-TYPE>                      6-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-END>                               MAR-31-1998
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<INVESTMENTS-AT-VALUE>                      40,473,675
<RECEIVABLES>                                8,251,065
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<OTHER-ITEMS-ASSETS>                                 0
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<ACCUMULATED-NET-GAINS>                        145,788
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       193,649
<NET-ASSETS>                                (3,193,784)
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              961,681
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  62,408
<NET-INVESTMENT-INCOME>                        899,273
<REALIZED-GAINS-CURRENT>                       164,254
<APPREC-INCREASE-CURRENT>                      193,649
<NET-CHANGE-FROM-OPS>                        1,257,176
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                       (18,466)
<DISTRIBUTIONS-OTHER>                         (461,718)
<NUMBER-OF-SHARES-SOLD>                     31,982,110
<NUMBER-OF-SHARES-REDEEMED>                   (486,651)
<SHARES-REINVESTED>                            469,351
<NET-CHANGE-IN-ASSETS>                      32,741,802
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           39,005
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                (23,608)
<AVERAGE-NET-ASSETS>                        31,463,000
<PER-SHARE-NAV-BEGIN>                            10.00
<PER-SHARE-NII>                                   0.41
<PER-SHARE-GAIN-APPREC>                           0.00
<PER-SHARE-DIVIDEND>                              0.00
<PER-SHARE-DISTRIBUTIONS>                        (0.16)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              10.25
<EXPENSE-RATIO>                                   0.40
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                              0.00
        
















</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>











<ARTICLE> 6
<CIK> 0000887991
<NAME> PRUDENTIAL INDEX SERIES FUND
<SERIES>
   <NUMBER> 004
   <NAME> EUROPE  INDEX FUND (CLASS Z)
       
<S>                             <C>
<PERIOD-TYPE>                      6-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-END>                               MAR-31-1998
<INVESTMENTS-AT-COST>                       15,551,033
<INVESTMENTS-AT-VALUE>                      18,300,846
<RECEIVABLES>                                   75,419
<ASSETS-OTHER>                                 139,219
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                       0
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       37,972
<TOTAL-LIABILITIES>                                  0
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    15,741,299
<SHARES-COMMON-STOCK>                        1,573,752
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                         (40,219)
<ACCUMULATED-NET-GAINS>                         26,473
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     2,749,959
<NET-ASSETS>                                (1,573,752)
<DIVIDEND-INCOME>                              113,176
<INTEREST-INCOME>                               10,150
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  46,620
<NET-INVESTMENT-INCOME>                         76,706
<REALIZED-GAINS-CURRENT>                        17,637
<APPREC-INCREASE-CURRENT>                    2,749,959
<NET-CHANGE-FROM-OPS>                        2,844,302
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                         (108,089)
<NUMBER-OF-SHARES-SOLD>                     15,896,656
<NUMBER-OF-SHARES-REDEEMED>                   (263,388)
<SHARES-REINVESTED>                            108,031
<NET-CHANGE-IN-ASSETS>                      18,477,512
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           31,080
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                (65,595)
<AVERAGE-NET-ASSETS>                        15,669,000
<PER-SHARE-NAV-BEGIN>                            10.00
<PER-SHARE-NII>                                   1.81
<PER-SHARE-GAIN-APPREC>                           0.00
<PER-SHARE-DIVIDEND>                              0.00
<PER-SHARE-DISTRIBUTIONS>                        (0.07)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              11.74
<EXPENSE-RATIO>                                   0.60
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                              0.00
        
















</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>











<ARTICLE> 6
<CIK> 0000887991
<NAME> PRUDENTIAL INDEX SERIES FUND
<SERIES>
   <NUMBER> 004
   <NAME> PACIFIC INDEX FUND (CLASS Z)
       
<S>                             <C>
<PERIOD-TYPE>                      6-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-END>                               MAR-31-1998
<INVESTMENTS-AT-COST>                       25,216,997
<INVESTMENTS-AT-VALUE>                      20,381,199
<RECEIVABLES>                                   92,948
<ASSETS-OTHER>                                 104,160
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                       0
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       55,106
<TOTAL-LIABILITIES>                                  0
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    25,317,412
<SHARES-COMMON-STOCK>                        2,538,788
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                       45,810
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                             78
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    (4,840,099)
<NET-ASSETS>                                (2,538,788)
<DIVIDEND-INCOME>                              141,044
<INTEREST-INCOME>                                2,458
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  63,245
<NET-INVESTMENT-INCOME>                         80,257
<REALIZED-GAINS-CURRENT>                       (16,468)
<APPREC-INCREASE-CURRENT>                   (4,531,616)
<NET-CHANGE-FROM-OPS>                       (4,467,827)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                          (25,244)
<NUMBER-OF-SHARES-SOLD>                        344,875
<NUMBER-OF-SHARES-REDEEMED>                    (52,926)
<SHARES-REINVESTED>                             25,263
<NET-CHANGE-IN-ASSETS>                      (4,175,859)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           42,158
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                (42,375)
<AVERAGE-NET-ASSETS>                        21,137,000
<PER-SHARE-NAV-BEGIN>                             9.88
<PER-SHARE-NII>                                  (1.79)
<PER-SHARE-GAIN-APPREC>                           0.00
<PER-SHARE-DIVIDEND>                              0.00
<PER-SHARE-DISTRIBUTIONS>                        (0.01)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                               8.08
<EXPENSE-RATIO>                                   0.60
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                              0.00
        
















</TABLE>

<TABLE> <S> <C>











<ARTICLE> 6
<CIK> 0000887991
<NAME> PRUDENTIAL INDEX SERIES FUND
<SERIES>
   <NUMBER> 004
   <NAME> SMALL CAP-INDEX FUND (CLASS Z)
       
<S>                             <C>
<PERIOD-TYPE>                      6-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-END>                               MAR-31-1998
<INVESTMENTS-AT-COST>                       24,054,769
<INVESTMENTS-AT-VALUE>                      25,614,758
<RECEIVABLES>                                   64,551
<ASSETS-OTHER>                                  36,835
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                       0
<PAYABLE-FOR-SECURITIES>                        71,493
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       37,293
<TOTAL-LIABILITIES>                                  0
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    23,879,782
<SHARES-COMMON-STOCK>                        2,397,055
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                       18,656
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        146,105
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     1,562,815
<NET-ASSETS>                                (2,397,055)
<DIVIDEND-INCOME>                               81,565
<INTEREST-INCOME>                               22,562
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  54,097
<NET-INVESTMENT-INCOME>                         50,030
<REALIZED-GAINS-CURRENT>                       146,105
<APPREC-INCREASE-CURRENT>                    1,562,815
<NET-CHANGE-FROM-OPS>                        1,758,950
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                          (31,374)
<NUMBER-OF-SHARES-SOLD>                     25,073,806
<NUMBER-OF-SHARES-REDEEMED>                 (1,225,384)
<SHARES-REINVESTED>                             31,360
<NET-CHANGE-IN-ASSETS>                      25,607,358
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           32,458
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                (32,250)
<AVERAGE-NET-ASSETS>                        21,808,000
<PER-SHARE-NAV-BEGIN>                            10.00
<PER-SHARE-NII>                                   0.69
<PER-SHARE-GAIN-APPREC>                           0.00
<PER-SHARE-DIVIDEND>                              0.00
<PER-SHARE-DISTRIBUTIONS>                        (0.01)
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              10.68
<EXPENSE-RATIO>                                   0.50
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                              0.00
        
















</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>











<ARTICL6
<CIK>
<NAMEPRUDENTIAL INDEX SERIES FUND
<SERIES>
   <NUMB001
   <NAMSTOCK INDEX FUND (CLASS Z)
       
<S>                       <C>
<PERIOD-TYPE>                6-MOS
<FISCAL-YEAR-END>                   SEP-30-1998
<PERIOD-END>                        MAR-31-1998
<INVESTMENTS-AT-COST>              654,926,926
<INVESTMENTS-AT-VALUE>             877,758,016
<RECEIVABLES>                        5,954,927
<ASSETS-OTHER>                         424,620
<OTHER-ITEMS-ASSETS>                         0
<TOTAL-ASSETS>                     884,137,563
<PAYABLE-FOR-SECURITIES>             6,173,662
<SENIOR-LONG-TERM-DEBT>                      0
<OTHER-ITEMS-LIABILITIES>            2,967,651
<TOTAL-LIABILITIES>                  9,141,313
<SENIOR-EQUITY>                              0
<PAID-IN-CAPITAL-COMMON>           645,332,305
<SHARES-COMMON-STOCK>               35,169,428
<SHARES-COMMON-PRIOR>               22,775,309
<ACCUMULATED-NII-CURRENT>            2,980,110
<OVERDISTRIBUTION-NII>                       0
<ACCUMULATED-NET-GAINS>              3,635,583
<OVERDISTRIBUTION-GAINS>                     0
<ACCUM-APPREC-OR-DEPREC>           223,048,252
<NET-ASSETS>                       874,996,250
<DIVIDEND-INCOME>                    5,036,857
<INTEREST-INCOME>                      871,094
<OTHER-INCOME>                               0
<EXPENSES-NET>                       1,117,861
<NET-INVESTMENT-INCOME>              4,790,090
<REALIZED-GAINS-CURRENT>             3,847,583
<APPREC-INCREASE-CURRENT>          106,706,326
<NET-CHANGE-FROM-OPS>              115,343,999
<EQUALIZATION>                               0
<DISTRIBUTIONS-OF-INCOME>                    0
<DISTRIBUTIONS-OF-GAINS>           (10,316,301)
<DISTRIBUTIONS-OTHER>               (5,903,209)
<NUMBER-OF-SHARES-SOLD>            438,936,108
<NUMBER-OF-SHARES-REDEEMED>       (177,285,144)
<SHARES-REINVESTED>                 16,213,432
<NET-CHANGE-IN-ASSETS>             376,988,885
<ACCUMULATED-NII-PRIOR>              4,093,229
<ACCUMULATED-GAINS-PRIOR>           10,104,301
<OVERDISTRIB-NII-PRIOR>                      0
<OVERDIST-NET-GAINS-PRIOR>                   0
<GROSS-ADVISORY-FEES>                1,000,421
<INTEREST-EXPENSE>                           0
<GROSS-EXPENSE>                        794,663
<AVERAGE-NET-ASSETS>               239,788,000
<PER-SHARE-NAV-BEGIN>                    21.86
<PER-SHARE-NII>                          3.590
<PER-SHARE-GAIN-APPREC>                   0.00
<PER-SHARE-DIVIDEND>                     0.000
<PER-SHARE-DISTRIBUTIONS>                (0.59)
<RETURNS-OF-CAPITAL>                      0.00
<PER-SHARE-NAV-END>                      24.86
<EXPENSE-RATIO>                           0.40
<AVG-DEBT-OUTSTANDING>                       0
<AVG-DEBT-PER-SHARE>                      0.00
        


</TABLE>



For the semi-annual period ended March 31, 1998
File number 811-6677

                         SUB-ITEM 77 0

                            EXHIBITS

          Transactions Effected Pursuant to Rule 10f-3

1.   Name of Issuer
       Tower Realty Trust, Inc.

2.   Date of Purchase
       10/09/97

3.   Number of Securities Purchased
       26,700

4.   Dollar Amount of Purchase
       $694,200

5.   Price Per Unit
       $26.00

6.   Name(s) of Underwriter(s) or Dealer(s)
     From whom Purchased
     
     Merrill  Lynch,  Pierce, Fenner  and  Smith
Inc.
     
7.   Other Members of the Underwriting Syndicate

     Morgan  Stanley, Goldman Sachs and  Merrill
Lynch
    Legg Mason Wood Walker, Inc.
    Prudential Securities Incorporated
    Smith Barney, Inc.
    Nationsbanc Montgomery Securities, Inc.
    Board of Trustees Alex Brown, Inc.
    SBC Warburg Dillon Reed, Inc.
    Donaldson, Luftkin & Jenrette Securities
    A.G. Edwards & Sons
    Goldman Sachs & Co.
    Lazard Freres & Co.
    Lehman Brothers, Inc.
    PaineWebber Inc.
    Advest, Inc.
    J.C. Bradford & Co.
    Cowen & Co.
    EVEREN Securities, Inc.
    Ferris, Baker, Watts, Inc.
    First of Michigan Corp.
    Furman Selz LLC
    Gruntal & Co. LLC
    Interstate/Johnson Lane Corp.
    Janney Montgomery Scott, Inc.
    Jeffries & Company, Inc.
    Edward D. Jones & Co.
    McDonald & Company Securities, Inc.
    Mesirow Financial, Inc.
    Morgan Keegan & Company
    Nesbitt Burns Securities, Inc.
    Ormes Capital Markets, Inc.
    Piper Jaffray, Inc.
    Principal Financial Securities, Inc.
    Rauscher Pierce Refsnes, Inc.
    Raymond James & Associates, Inc.
    The Robinson-Humphrey Company, Inc.
    Roney & Co. LLC
    Sands Brothers & Co.
     Stifel, Nicolaus & Co.
    Sutro & Co.
    Tucker Anthony, Inc.
    Utendahl Capital Partners
    Wheat First Securities, Inc.
   
   
   
   
   
   
   




For the semi-annual period ended March 31, 1998
File number 811-6677

                         SUB-ITEM 77 0

                            EXHIBITS

          Transactions Effected Pursuant to Rule 10f-3

1.   Name of Issuer
       Tower Realty Trust, Inc.

2.   Date of Purchase
       10/09/97

3.   Number of Securities Purchased
       26,700

4.   Dollar Amount of Purchase
       $694,200

5.   Price Per Unit
       $26.00

6.   Name(s) of Underwriter(s) or Dealer(s)
     From whom Purchased
     
     Merrill  Lynch,  Pierce, Fenner  and  Smith
Inc.
     
7.   Other Members of the Underwriting Syndicate

     Morgan  Stanley, Goldman Sachs and  Merrill
Lynch
    Legg Mason Wood Walker, Inc.
    Prudential Securities Incorporated
    Smith Barney, Inc.
    Nationsbanc Montgomery Securities, Inc.
    Board of Trustees Alex Brown, Inc.
    SBC Warburg Dillon Reed, Inc.
    Donaldson, Luftkin & Jenrette Securities
    A.G. Edwards & Sons
    Goldman Sachs & Co.
    Lazard Freres & Co.
    Lehman Brothers, Inc.
    PaineWebber Inc.
    Advest, Inc.
    J.C. Bradford & Co.
    Cowen & Co.
    EVEREN Securities, Inc.
    Ferris, Baker, Watts, Inc.
    First of Michigan Corp.
    Furman Selz LLC
    Gruntal & Co. LLC
    Interstate/Johnson Lane Corp.
    Janney Montgomery Scott, Inc.
    Jeffries & Company, Inc.
    Edward D. Jones & Co.
    McDonald & Company Securities, Inc.
    Mesirow Financial, Inc.
    Morgan Keegan & Company
    Nesbitt Burns Securities, Inc.
    Ormes Capital Markets, Inc.
    Piper Jaffray, Inc.
    Principal Financial Securities, Inc.
    Rauscher Pierce Refsnes, Inc.
    Raymond James & Associates, Inc.
    The Robinson-Humphrey Company, Inc.
    Roney & Co. LLC
    Sands Brothers & Co.
     Stifel, Nicolaus & Co.
    Sutro & Co.
    Tucker Anthony, Inc.
    Utendahl Capital Partners
    Wheat First Securities, Inc.
   
   
   
   
   
   
   




Prudential Index Series Fund







                                             May
29, 1998

SEC Operations Center (OFCIS)
6432 General Green Way
Mail Stop 0-7
Alexandria, VA 22312

Attention:  File Support Unit


                    Re:  Prudential Index Series
Fund
                         File No. 811-6677


Ladies and Gentlemen:

     Enclosed is one (1) copy of the of the Semi-
Annual Report on Form N-SAR for Prudential Index
Series Fund for the period ended March 31, 1997.
The Form N-SAR was filed using the Edgar system.


                                   Very truly
yours,



                                   /s/
Marguerite E.H. Morrison
                                   Marguerite
E.H. Morrison
                                   Assistant
Secretary

MEHM/ln
Enc.
This report is signed on behalf of the
Registrant in the City of Newark and State of
New Jersey on the 29th day of May, 1998.







                 Prudential Index Series Fund





Witness:/s/Marguerite E.H. Morrison  By:/s/Grace
C. Torres
        Marguerite E.H. Morrison        Grace C.
Torres
        Assistant Secretary
Treasurer






























t:\martin\N-SAR\Index\5-98\Letter











                                             November 29, 1996

SEC Operations Center (OFCIS)
6432 General Green Way
Mail Stop 0-7
Alexandria, VA 22312

Attention:  File Support Unit


                    Re:  Prudential Dryden Fund
                         File No. 811-6677


Ladies and Gentlemen:

     Enclosed is one (1) copy of the of the Annual Report on Form
N-SAR for Prudential Dryden Fund for the period ended September 30,
1996. The Form N-SAR was filed using the Edgar system.



                                   Very truly yours,



                                   /s/ Marguerite E. H. Morrison 
                                   Marguerite E.H. Morrison
                                   Assistant Secretary

MEHM/ln
Enc.
<PAGE>
This report is signed on behalf of the Registrant in the City of
New York and State of New York on the 29th day of November, 1996.






                The Prudential Institutional Fund





Witness:/s/ Marguerite E. H. Morrison   By:/s/ Eugene S. Stark
        Marguerite E.H. Morrison        Eugene S. Stark    
        Assistant Secretary             Treasurer

WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>











<ARTICL6
<CIK>
<NAMEPRUDENTIAL INDEX SERIES FUND
<SERIES>
   <NUMB004
   <NAMSTOCK INDEX FUND (CLASS I)
       
<S>                       <C>
<PERIOD-TYPE>                6-MOS
<FISCAL-YEAR-END>                   SEP-30-1998
<PERIOD-END>                        MAR-31-1998
<INVESTMENTS-AT-COST>              654,926,926
<INVESTMENTS-AT-VALUE>             877,758,016
<RECEIVABLES>                        5,954,927
<ASSETS-OTHER>                         424,620
<OTHER-ITEMS-ASSETS>                         0
<TOTAL-ASSETS>                     884,137,563
<PAYABLE-FOR-SECURITIES>             6,173,662
<SENIOR-LONG-TERM-DEBT>                      0
<OTHER-ITEMS-LIABILITIES>            2,967,651
<TOTAL-LIABILITIES>                  9,141,313
<SENIOR-EQUITY>                              0
<PAID-IN-CAPITAL-COMMON>           645,332,305
<SHARES-COMMON-STOCK>               35,169,428
<SHARES-COMMON-PRIOR>               22,775,309
<ACCUMULATED-NII-CURRENT>            2,980,110
<OVERDISTRIBUTION-NII>                       0
<ACCUMULATED-NET-GAINS>              3,635,583
<OVERDISTRIBUTION-GAINS>                     0
<ACCUM-APPREC-OR-DEPREC>           223,048,252
<NET-ASSETS>                       874,996,250
<DIVIDEND-INCOME>                    5,036,857
<INTEREST-INCOME>                      871,094
<OTHER-INCOME>                               0
<EXPENSES-NET>                       1,117,861
<NET-INVESTMENT-INCOME>              4,790,090
<REALIZED-GAINS-CURRENT>             3,847,583
<APPREC-INCREASE-CURRENT>          106,706,326
<NET-CHANGE-FROM-OPS>              115,343,999
<EQUALIZATION>                               0
<DISTRIBUTIONS-OF-INCOME>                    0
<DISTRIBUTIONS-OF-GAINS>           (10,316,301)
<DISTRIBUTIONS-OTHER>               (5,903,209)
<NUMBER-OF-SHARES-SOLD>            438,936,108
<NUMBER-OF-SHARES-REDEEMED>       (177,285,144)
<SHARES-REINVESTED>                 16,213,432
<NET-CHANGE-IN-ASSETS>             376,988,885
<ACCUMULATED-NII-PRIOR>              4,093,229
<ACCUMULATED-GAINS-PRIOR>           10,104,301
<OVERDISTRIB-NII-PRIOR>                      0
<OVERDIST-NET-GAINS-PRIOR>                   0
<GROSS-ADVISORY-FEES>                1,000,421
<INTEREST-EXPENSE>                           0
<GROSS-EXPENSE>                        794,663
<AVERAGE-NET-ASSETS>               428,992,000
<PER-SHARE-NAV-BEGIN>                       22
<PER-SHARE-NII>                          3.620
<PER-SHARE-GAIN-APPREC>                      0
<PER-SHARE-DIVIDEND>                         0
<PER-SHARE-DISTRIBUTIONS>               (0.600)
<RETURNS-OF-CAPITAL>                         0
<PER-SHARE-NAV-END>                         25
<EXPENSE-RATIO>                              0
<AVG-DEBT-OUTSTANDING>                       0
<AVG-DEBT-PER-SHARE>                         0
        


</TABLE>


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