244 s. GOTO. 



on the left side of the ovary, and reaching tlie 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 ])roceeds 

 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 caliljre generally all the way after forming the large 

 loop just in front of the ovary. 



i/rt?>?7rti — Mouth -cavity of Ilislioplwrns oricnlalis (Jap. Bashö- 

 kajiki), llisliophonts sp. (rTa[). Kajiki), and another undetermined 

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



Locality — Misaki. 



Date— Auo-ust 1S91 and '92. 



This species may pcjssibly prove identical with T. hidiophorl of 

 Jeffrey Bell, specimens of which had l)een collected in Madras by 

 F. Day from Ilistioplionis hrcvirostris ; but from the meagreness of the 

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

 For the sake of comparison I here subjoin the whcjle description'^ and 

 the measurements of the worm recorded : " With a cl<3se resemblance 

 to T. coccineum, it is distinguished by the al)sence of parallel rows of 

 chitinous corpuscles and l)y 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., l^mm. xll.5 mm., and 10.5 mm. x 10 mm. 



1). Jeffrey Bell — Description of a Xew Species of Tristomuni from Histiophorus brevirostris. 

 Annals and Ma<,'azine of Xat. Hist., vol. VII, Gth ser. 1891. pp. 531-535. 



