36 



Art. 9.---M. Yeri and T. Kaburaki 



The testes are placed in the ventral half of body; the sperm 

 canals proceeding from them appear to form an anastomosing; 

 system. The seminal canals (textfig. 38, sc), coming from behind, 

 unite in front of the female genital organs into a median canal, 

 which is continuous with the muscular seminal vesicle (textfig. 39,, 

 sv). Anteriorly this vesicle gives rise to a slender duct, the 



ejaculatory duct, which pursues 

 a somewhat S-iike course on, 

 the right side of the prostate 

 (pi'), and after receiving the 

 duct of this organ enters into 

 the penis. The pyriform pros- 

 tate lies just dorsal to the base 

 of penis (p), which is repre- 

 sented by a horny stylet hang- 

 ing vertically in the sheath. 

 The antrum musculinum (am) 

 forms an obliquely upwardly 

 directed, annular outbulging 

 before it opens externally. 

 The external aperture lies in 

 the median line, closely be- 

 hind the pharyngeal chamber, 

 the male end-organs being 

 present in a single set. 



The ovaries are clorsally 

 situated and are joined to the 

 uteri by an indistinct system of anastomosing canals. The two 

 uteri, filled with ova, meet in the median line to communicate 

 with the shell-gland passage (sgp), which proceeds obliquely 

 anteriorly and ventrally and distends itself to form the antrum just 

 before opening externally behind the male aperture. 



sgp $. af sv am $- p ph 



Textfig. 38. Diagrammatic figure of the male 

 genital end-organs of Pscudoceros rcticulatus, 

 as seen from the ventral side. 



Textfig. 39. Genital end-organs of P. rcticulatus 

 in longitudinal section. Semi diagrammatic. 

 Index letters as in textfigs. 4, 10 and 15. 



