EXPLANATION OF PLATE IV. 



Fig. 1. — RkynchobotJirius ilisha, n. sp. Whole worm. 



2. — Head of the same showing its internal anatomy. 



2 (a) — (e). — Various types of hooks found on the proboscides of 

 R. ilisha. 



3. — Two proglottids of the same showing the excretory, water 

 vascular and nervous systems. 



4. — Anatomy of a proglottid of the same. 



5. — Cyst of R. ilisha from the lateral muscles of Hilsa. 



6. — Young of R. ilisha dissected out of the cyst. 



7. — Young individual of R. ilisha from the stomach of the shark. 



8. — Cyst of Syndesmohothrium filicolle from the lateral muscles 

 of Hilsa. 



9. — Young of S. filicolle dissected out of the cyst with the anatomy. 

 Reference Lettering. 



B-, Bothridium. C, Cirrus-sac. E.D., Excretory duct. N., Nerve cord. O.d., 

 Oviduct. Ov., Ovary. P., Proboscid. P.S., Proboscis sac. i?..S'., Receptaculum 

 seminis. S.G., Shell gland. T., Testis. Vt., Uterus. V., Vagina. V.D., Vas deferens 

 V-S., Vesicula seminalis. W.7\, Water-vascular tube. Y., Larva in the Cyst. 



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