50 



BULLETIN 69, UNITED STATES NATIONAL MUSEUM. 



and cirrus pouch pass on the dorsal side of the nerve aiid excretory 

 vessels. 



In this species the segments become gravid much earlier than in 

 the other, as the posterior segments of a strobila 20 mm. long con- 



c.p. 



ves. sem. 



-ex. 



at. 



lOQu.. 



PiQ 41. DiORCHIS AMERICANA: GeAVID SEGIIENT, TRANSVERSE SECTION. C. p., CiRRUS 



OUCH. d. ex., DoRAL excretory vessel. /. n.. Nerve cord, ut.. Uterus, ves. sem.. 

 Seminal vesicle, v. ex.. Ventral excretory vessel. 



tained a well-developed uterus, whereas in Diorcliis acuminata the 

 uterus had not yet appeared in the posterior segments of a strobila 

 36 mm. long. 



sem.recept. 



ut. 



ves. sera. 



lOQii. 



Fig. 42. — Diorchis Americana : Gravid segments, horizontal section, cir.. Cirrus. 

 sem. recent., Seminal receptacle, ui.. Uterus, tag.. Vagina, res. sem.. Seminal, 

 vesicle. 



Male rejjroductive organs. — The testicles (fig. 39, ^.), two in num- 

 ber, attaining a maximum size of 100 to 130/x, are located, as in 

 D. acnmiinata^ in the posterior portion of the segment near the djorsal 

 surface, one on either side of the median line. 



