14 



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



12 



pi- 

 ed 



regarded as the tentacular. The eye-spots are distributed on both 

 sides of the brain which is positioned about 3 mm. from the 

 anterior margin. 



Seminal canals (textfig. 12, sc) of both sides continuous across 

 the median line slightly behind the female genital opening, forming 

 a loop. Anteriorly they extend to the level of the mouth, and then 

 divide each into two limbs. One of these proceeds further forward, 

 while the other turns abruptly backward and inward. The latter 

 eventually unites with its mate of the other side in the median 

 line and forms a short common duct, which soon passes from 

 behind into the moderately large muscular seminal vesicle (textfig. 



13, sv) situated be- 

 hind the posterior 

 end of pharynx. 

 The anterior part 

 of the seminal vesi- 

 cle bends upward 

 and backward, and 

 is continuous with 

 the slender ejacu- 

 latory duct (ed). 

 This, after passing 

 through the ovoid 

 prostate (pr), pur- 

 sues a somewhat 

 tortuous course be- 

 fore entering the 

 base of penis. The 

 prostate is sur- 

 rounded by a 

 muscular sheath 

 and contains seven 

 small and slender 

 chambers, which 

 lie around the 

 ejaculator} T duct 



sv v # *gp •? av 



Textfig. 12. Diagrammatic combination figure of the genital 

 end-organs of N. delicata, as seen from the ventral side. 



Textfig. 13. Semidiagrammatic representation of the genital 

 end-organs of X. delicata in sagittal section. 

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



