Description of Some Japanese Polyclad Turbellaria. 



21 



PA 



sgp 



vesicle gives rise to 

 the ejaculatory duct 

 (ed), which, after 

 receiving tlie short 

 duct of the prostate, 

 hends dorsal ward 

 and then opens into 

 the cirrus cavity. 

 The prostate (pr) is a 

 spherical body much 

 larger than the semi- 

 nal vesicle, and is 

 imbedded, together 

 with the latter, in 

 the muscular sheath 

 of cirrus dulb; the 

 internal thick and 

 glandular epithelium 

 of the cirrus is 

 thrown into much 

 folds. Cirrus (c) 

 large, somewhat 

 cylindrical; the in- 

 ternal epithelium of 

 cirrus cavity beset with chitinous bristles, which, on protrusion of 

 the cirrus, would cover the entire external surface of that organ. 

 Male genital aperture situated at about the posterior end of the 

 middle third of body. 



Ovaries distributed in the dorsal parts. The two uteri (//) 

 extend posteriorly from the sides of the hind parts of pharyngeal 

 sac, clasping between them the cirrus bulb and converging together 

 all the while. At their hind end they are thin tubes and unite, 

 at a dorsal position nearly above or somewhat behind the male 

 genital opening, into a short posteriorly directed median tube (uu), 

 which joins another median tube on the ventral side. This leads 

 posteriorly into the blind accessory vesicle (av) and anteriorly into 



^ i * <i ! 1' 



Jj> vb sg *£■ cd sv 



Textfig. 21. Diagrammatic combination figure of the. genital 

 end-organs of PI. reticulata, as seen from the ventral side. 

 Textfig. 22. Genital end-organs of PI. reticulata in longitudinal 

 section. Seuii diagrammatic. 

 vb vagina bulbosa. 

 Otber letters as in textnW 4, 7, 10 and 18. 



