244 



S. GOTO. 



on the left side of the ovary, and reaching the plane of the anterior end 

 of the latter, it bends towards the right and forms a large loop with 

 secondary windings lying horizontally just in front of the ovary, 

 with its closed end directed towards the right ; after this the vas 

 deferens makes numerous, complicated convolutions, and proceeds 

 forwards and towards the left, keeping itself just inside the vaginal 

 canal ; a little in front of the ootyp it bends towards the right and 

 enters the penis at some distance from its base, and finally opens into 

 its cavity on the top of a small papilla at some distance from its apex ; 

 diminishing in calibre generallj'^ all the way after forming the large 

 loop just in front of the ovary. 



Habitat — Month-cavity of Histiophoms orieiitalis (Jap. Basho- 

 kajiki), Histiophoms sp. (Jap. Kajiki), and another undetermined 

 species perhaps of the genus Cijhium (Jap. Oki-ma-zawara). 



Locality — Misaki. 



Date— August 1891 and '92. 



This species may possibly prove identical with T. histiopliori of 

 Jeffrey Bell, specimens of which had been collected in Madras by 

 F. Day from Histiophoms hrevirostris ; but from the meagreness of the 

 description I am not able to determine whether it is really so or not. 

 For the sake of compai-ison I here subjoin the whole description'^ and 

 the measurements of the worm recorded : " With a close resemblance 

 to T. coccineum, it is distinguished by the absence of parallel rows of 

 chitinous corpuscles and by the fact that the posterior sucker projects 

 by about one-third of its diameter beyond the margin of the body." 

 Measurements of three specimens are stated to have been respective- 

 ly 15 mm. xl2 mm., 14 mm. x 11.5 mm., and 10.5 mm.xlO mm. 



1) . Jeffrey Bell — Description of a Xew Species of Tristoinum from Hisfciopliorus brevirostris. 

 Annals and Magazine of Nat. Hist., vol. VII, 6th ser. 1891. pp. 534-533. 



