Description of Some'vTapanese Polyclad Turbellaria. 



33 



vesicle (textfig. 37, sv). Posteriorly this is continuous with the very 

 long and thin ejaculatory duct (ed), finally opening at the tip of the 

 slender penis. The prostate (p*) is of an ovoid shape and is situated 

 immediately anterior and dorsal to the seminal vesicle; its posterior- 

 ly directed duct passes dorsal to the ejaculatory duct and opens at the 

 apex of penis together with the ejaculatory duct. The intromittent 



part of the penis (p) is 

 very long and slender- 

 ly cylindrical; it is 

 unarmed. The penis 

 sheath is tubular in 

 accordance with the 

 shape of penis, and 

 opens the external 

 aperture at its hind 

 end, at a distance of 

 about 10 mm. from 

 the posterior body 

 extremity. 



The ovaries are 

 largely dorsal in po- 

 sition. The uteri (•»/■), 

 after running closely 

 along the pharynx, 

 unite with each other 

 and form the unpaired 

 m * * s \ J r uterine duct (mm) above 



TLextfig. 36. Diagrammatic representation ot the genital 



end-organs of G. marginata, as seen from the ventral the prostate \pïj / the 

 side. . . _ 



Textfig. 37. (î.mital end-organs of C. marginata in longi- dllCt SOOn JOUIS tllO 

 tndinal section. Semidiagrammatic. ^ / \ ti 



prd prostatic dncfc. egg-canal yec). i)rom 



Other letters as in textfigs. 4, 7 and 10. , . . , . . , , i 



this junction point the 

 egg-canal extends posteriorly to the point of its origin by union of 

 the two accessory vesicles (av), which anteriorly extend up to the 

 level of the mouth. Anteriorly the egg-canal makes an abrupt 

 downward and backward bend and then continues as a long and 

 posteriorly directed vaginal passage (v), abundantly supplied with 



eg 



Ol 



iir 



