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                                               ORIGINAL ARTICLES

                        A COMPARATIVE STUDY OF SCHISTOSOMA SPINDALIS,
                      
MONTGOMERY, 1906 AND SCHISTOSOMA NASALIS, N. SP.

                                                            BY

                                          M. ANANT NARAYAN RAO,

                        Lecturer in Parasitology, Madras Veterinary College.

                         (Received for publication on 27th October 1933.)

                                (With Plates I-V and five text-figures.)

                                                    CONTENTS.

PAGE.

INTRODUCTION . . . . . . . .

l

OVA . . . . . . . .

3

MIRACIDIA . . . . . . . .

6

INTERMEDIARY HOST . . . . . . . .

9

CERCARIAE . . . . . . . .

10

EXPERIMENTAL INFECTION AND INCUBATION PERIOD . . . . . . . .

12

EARLY SYMPTOMS IN EXPERIMENTAL CALVES INFECTED WITH CERCARIA
INDICAE XXX . . . . . . . .

13

POST-MORTEM FINDINGS . . . . . . . .

14

SOME OBSERVATIONS IN HISTOPATHOLOGY . . . . . . . .

15

EXPERIMENTAL INFECTION WITH CERCARIAE OF S. SPINDALIS . .

17

POST-MORTEM FINDINGS IN CALVES INFECTED WITH S. SPINDALIS . .

18

SOME OBSERVATIONS ON SCHISTOSOMES COLLECTED FROM ANIMALS IN
THE ABATTOIRS . . . . . . . .

19

THE HABITAT OF S. SPINDALIS AND THE NASAL SCHISTOSOME . . .

19

DISCUSSION ON SOME POINTS OF DIFFERENCE IN THE MORPHOLOGY OF
S. SPINDALIS AND THE NASAL SCHISTOSOME . . . . . . . .

21

THE IDENTITY OF THE NASAL SCHISTOSOME . . . . . . . .

24

SPECIFIC DIAGNOSIS . . . . . . . .

24

GENERAL REMARKS . . . . . . . .

24

ACKNOWLEDGMENTS . . . . . . . .

27

REFERENCES . . . . . . . .

27

                                             INTRODUCTION.

In the domesticated animals in India four species of Schistosomes are known to
exist, one being S. bovis Sonsino, 1876, and the other three being S. bomfordi,
S. spindalis
and S. indicum discovered by Montgomery in 1906. All these Schisto-

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