232 ^- <ïOTo. 



genital atrium. Vaginal openiiuj 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, snrronnded with a mas8 of compact connect- 

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

 rcccptaculani ^ciuinis, from which a short canal proceeds backwards and 

 opens into the oviduct side l)y side with the yolk-duct. I'itcUarium 

 ni'ainly confined to the lateral areas of the body outside the intestinal 

 trunks, extending from al)out the plane of the front end of the 

 ])harynx to th;it of the termination of the intestinal trunks. The 

 vitelhuàum 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 ji'iircd yolk-ditcf. 

 This tiicn proceeds straight towards the median line and opens into 

 the oviduct -it 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 

 gl(jbular in f )rm ; the other two just in front of this and closely 

 appressed to each other as well as to the posterior testis, so that the 

 boundary separating the three has the form of A. Vas deferens arising 

 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 nraking one or two convolutions, 

 reaches tlie fr(.)nt end of the ootyp. Here it again turns forwards 

 and passing through the hiilhus ejactdatoriits, opens finally at the base 

 of the tubular chitinous penis. 



ILdiitat — ]\[(3uth-cavity of Tnjgon pastiiiaca (Jap. Aka-ei). 



Localilii — Hiroshima (Ujina Port). 



D^^c— Auo-ust 188'j. 



