Description of Some Japanese Polyclad Turbellaria. 



29 



31 



of penis, it receives the duct of the prostate, placed dorsally to the 

 seminal vesicle. The prostate {pr) is a muscular organ of an 



elongate pyri- 

 forrri shape. 

 The conical in- 

 tromittent part 

 of penis is sub- 

 vertically dis- 

 posed in its 

 sheath, which 

 opens directly to 

 the exterior by 

 the male genital 

 pore. 



The female 

 genital aperture 

 leads into the 

 tubular antrum 

 femininum or 

 shell-gland pas- 

 sage (sgp)> which 

 pursues an up- 

 ward and some- 

 what forewardly 

 oblique course, 

 at the end of 



which it makes an abrupt turn backward, to continue itself as the 

 egg-canal {ec). This receives in its course the common uterine 

 duct (uu) and finally passes over into the large accessory vesicle 

 (av) of an oblong-ovoid shape. 



The present species closely resembles the preceding in external 

 features. But it differs from this, amongst other points, in the 

 arrangement of the parts of the male genital organ. 



32 



sv sc cd p -$• sgp Jjl ec a r 



Textfig. 31. Diagrammatic representation of the genital end-organs 



of P.fulvus, as seen from the ventral side. 

 Texfcfig. 32. Semi diagrammatic representation of the genital end- 

 organs of P.fulvus in longitudinal section. 

 Index letters as in textfigs. 4, 7 and 10. 



