18 



Art, 9.— M. Yeri ami T. Kaburak 



IS 



- - *0P 



Seminal canals, running backward along the sides of pharyn- 

 geal pocket, form on each side a slightly convoluted widening of 

 the nature of accessory seminal vesicles (textfigs. 18, 19, asv). 

 Posteriorly they join into a single median duct (cd) at a point far 

 in front of the male aperture. The median duct, after running 

 anteriorly for a short distance, enters the seminal vesicle at its 



anterior end. The 

 seminal vesicle (sv) 

 is an elongate-ovoid 

 muscular organ, im- 

 bedded in the paren- 

 chyma of the dorsal 

 parts of body. After 

 emerging from this 

 at the opposite end, 

 the duct directly 

 enters the muscular 

 wall of the some- 

 what ellipsoid cirrus 

 (c) and opens at the 

 tip of a small conical 

 and posteriorly 

 directed process pro- 

 jecting into the 

 cirrus cavity. The 

 surface of the latter 

 as well as that of 

 the process just 

 mentioned is beset 

 with stiff chitinous 

 bristles. The cirrus 

 cavity forms some irregular outbulgings and leads to the exterior, 

 through the tubular antrum musculinum (am), at a point behind 

 the pharyngeal sac. The prostate (pr) is a pyriform muscular organ 

 lying beneath the cirrus and opens behind into a ventral outbulging 

 of the floor of cirrus cavity. 



Textfig. 18. Diagrammatic representation of the genital 



end-organs of A r . elongata, as seen from the ventral side. 

 Textfig. 19. Genital end-organs of N. elongata in sagittal 

 section. Semidiagrammatic. 

 c cirrus. 

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



