232 s- cfOTO. 



genital atrium. Vaginal openiiifj on the left side of the body, a little 

 behind the common genital opening and on the same plane with the 

 anterior end of the ootyp, surrounded with a mass of compact connect- 

 ive tissue ; vaginal canal short and leading into a spacious, globular 

 receptaciduni seminis, from Avhich a short canal proceeds backwards and 

 opens into the oviduct side by side with the yolk-duct. Vitdlurium 

 mainly confined to the lateral areas of the body outside the intestinal 

 trunks, extending from about the plane of the front end of the 

 ]jharynx to that of the termination of the intestinal trunks. The 

 vitellarium of each side gives rise to two yolk -ducts which, coming 

 one from the anterior and the other from the posterior part, unite 

 just inside the intestinal trunks and give rise to the •paired, yolk-dud. 

 This th:n proceeds straight towards the median line and opens into 

 the oviduct at the point above specified, side by side with its fellow 

 of the opposite side. Testes posterior to the ovary, large, three 

 in number ; one being situated behind in the median line and 

 globular in form ; the other two just in front of this and closely 

 appresse^ to each other as well as to the posterior testis, so that the 

 boundary separating the three has the form of A. Vas deferens arisino- 

 from the anterior testis of the left side, proceeding forwards just inside 

 the left intestinal trunk to about midway between the common genital 

 opening and the hinder end of the pharynx, then turning back- 

 wards on the right side, and making one or two convolutions, 

 reaches the front end of the ootyp. Here it again turns forwards 

 and passing through the hulhus ejaculatorius, opens finally at the base 

 of the tubular chitinous penis. 



Habitat — Mouth-cavity of Trijgon pastinaca (Jap. Aka-ei). 



Localitg — Hiroshima (Ujina Port). 



Da«e— August 1889. 



