TiENIOID CESTODES OP NOKTH AMERICAN BIEDS. 



45 



Female refroductioe oryans. — The vagina, after crossing tlie excre- 

 tory canals, is enlarged to form a seminal receptacle (figs. 34, 3G, sem. 

 receijt.)^ which extends inward as far as the inner end of the cirrus 

 pouch. 



lOOu,. 

 Fig. 35. — Dioechis acuminata : Sexually mature segment, horizontal section, dr., 

 CiKKus. ov.. Ovary, v. ex., Ventral excretoey vessel, yg.. Yolk gland. 



The ovary (figs. 33-36, ov.) is trilobed, one lobe being anterior and 

 median, the other two lateral ; often by a division of the left lateral 

 lobe it becomes four-lobed. When fully developed the ovary extends 



lOQU/, 



Fig. 36. — Dioechis acuminata: Sexually mature segment, horizontal section, ov., 

 Ovary, sem. recept.. Seminal receptacle, yg.. Yolk gland. 



laterally as far as the excretory canals, and the median lobe extends 

 forward to the anterior border of the segment. It is ventral with 

 respect to the testicles. 



