gS Records of tJic Indian Museum. [Vor,. IX, 



the stomach of the Dolphin, and the Dolphin had been feeding on 

 fish as was shown b}^ the stomach contents. The young form 

 might not develop into an adult in the Dolphin, as nearly every 

 parasite has its particular host. 



Allocreadium annandalei, sp. nov. 

 (PI. ix, figs. 15—16.) 



A large number of specimens of this Trematode were obtained 

 from the stomach of a specimen of Rhynchohatis djeddensis measur- 

 ing 5 feet, caught in Portugal Bay, Ceylon, on February 2nd, 191 1. 

 The parasites were cylindrical in shape, slightly flattened dorso- 

 ventrally and measured on an average 13 mm. in length (alcoholic 

 specimens) and 3 mm, in breadth. The oral sucker is situated 

 ■5 mm. from the anterior end and is sub ventral. The ventral 

 sucker is situated 5 '5 mm. from the anterior extremity and is 

 raised above the general surface of the worm. The diameter of 

 both suckers is I'l mm. and each sucker is very strongly developed. 

 The genital aperture is situated nearer the oral than the ventral 

 sucker, and is so minute that it cannot be seen except in sections. 

 The excretory aperture is situated at the posterior extremity, 

 which is pointed. The portion of the worm anterior to the oral 

 sucker is flattened dorso-ventrally, and is also pointed. The ex- 

 ternal surface of the worm is marked by a series of both annular 

 and discontinuous concentric rings. 



Viewed in toio, cleared in clove oil, the edges of the worm 

 appear serrated. No spines, however, are present, the spinose 

 appearance being due entirely to the wrinkled cuticle. The mus- 

 cular system is strongly developed, the thickness of the muscular 

 wall of the body being '3 mm. in spirit specimens. 



Digestive system. — The mouth is situated at the base of the oral 

 sucker, and leads directly into a strong muscular pharynx. The 

 two rami of the intestine immediately succeed the pharynx and 

 run laterally close up to the body-wall, to the extreme posterior 

 end. 



Reproductive system. — There are a pair of large testes, situated 

 one in front of the other, at the extreme posterior end. They each 

 measure roughly 14 mm. long and are squarish or oblong in shape 

 and flattened dorso-ventrally. The vas deferens consists of a pair 

 of extremely delicate tubes running lateralh' (one on each side) to 

 a point jUst dorsal to the anterior rim of the ventral sucker, where 

 they unite and open into the cirrus sac. This is large, muscular 

 and conspicuous. 



The cirrus is an irregularly coiled organ lying midway' between 

 the cirrus sac and the large seminal vesicle. The seminal vesicle 

 abuts on the pharynx. 



The ovary is single and is situated just in front of the testes in 

 the middle line, 4"5 mm. from the posterior end. Between the ovar}- 

 and the testes is the shell gland. The uterus is a coiled tube Iving 



