I9I3-.1 T. SouTHWEU. : Parasites from Fish. 99 



between the ovar}- and the ventral sucker. Portions of the uterus 

 extend forward on each side of, and dorsal to, the ventral sucker, 

 and it eventually opens at the genital pore. The vitteline glands 

 consist of a series of grape-like follicles, situated laterally between 

 the ventral sucker and the extreme posterior end. The ducts con- 

 necting the follicles are clearly visible. In cross sections, the vit- 

 teline glands seem to be sunk in the muscular body- wall, and when 

 this wall is removed the vitteline glands come away with it. The 

 main ducts of the vitteline glands run transversel}^, one on each 

 side, and, uniting in the middle line, open at the junction of the shell 

 gland and the germarium, 4*4 mm. from the posterior extremity of 

 the worm. 



Excretory system. — As sections were not made, no details of 

 this system could be made out. 



Habitat. — The stomach of Rhynchohatis djeddensis. Sixty- 

 seven specimens. Pearl Banks, Ceylon. February 2nd, 1911. 



This species appears to fall naturally into the genus Allocrea- 

 diuni, Looss, of which the type species is Distomuui isoporum, 

 Looss. I have pleasure in naming m}- specimens in honour of 

 Dr. Annandale, Superintendent of the Indian Museum. 



Provisional description of a new genus and species of 



Trematode. 



Cylindrorchis, gen. nov. 



Body cylindrical. Oral and ventral suckers present, the 

 latter being situated near the anterior extremity. Genital pore 

 minute and situated immediately posterior to oral sucker. Intes- 

 tinal rami in form of a continuous letter S and extending to the 

 posterior end. Testes in front of germarium. The former are 

 paired, cylindrical, thick, conspicuous, bent in the form of the 

 letter S. They extend, one on each side, from the anterior margin 

 of the ventral sucker to a point one-third the length of the worm 

 from the posterior end. Germarium and shell gland single, median 

 and situated immediateh^ behind posterior limit of testes. Uterus 

 coiled and lying for the most part behind the germarium. Vitel- 

 line glands aggregated into two main masses, lateral to the 

 germarium, and situated on the loop of the intestine, one mass 

 on each side. Excretory pore median, terminal, posterior. 



The character of the testes indicates that this genus has no 

 close relationship with any other known genera. 



Parasitic in fishes. 



Cylindrorchis tenuicutis, sp. nov. 



(PI. X, figs. 17—18.) 



During the examination of a number of specimens of Tetrodon 

 stellatus, caught on the Ceylon Pearl Banks in 19 11, a few Trema- 

 todes were found in the air-bladder. In ever}- case where these 

 Trematodes were obtained, the air-bladder was found to be full of a 



