AFRICANA 



247 



broader than the scolex ; number of segments about 600 ; the hind- 

 most segments measure 7 mm. in length and 12 15 mm. in breadth. 

 The genital pores alternate irregularly in the middle of the border 



FIG. 170. Nearly mature segment of Tcenia africana, magnified. (After v. 

 Linstow.) The ovary is in the middle, and behind it are the shell-gland and 

 vitellogene gland; at the sides are the testicular vesicles, and the excretory canals 

 pass to the exterior ; the cirrus pouch, the vas deferens and the vagina are 

 on the left. 



FIG. 171. Proglottis of Tcenia africana, with uterus, magnified. (After v. 

 Linstow.) 



of the segments ; the testes are very numerous and occupy the 

 entire medullary layer ; the vas deferens is much convoluted ; the 



cirrus pouch is pyriform and thick 

 walled ; the cirrus and vagina are beset 

 with bristles directed outwards ; the re- 

 K-j I ^ ^"JB ceptaculum seminis is fusiform ; the 

 ovary is large and double, and consists of 

 radially placed club-shaped tubes that do 

 not anastomose and do not branch ; the 

 vitellogene gland is at the posterior border 

 of the proglot tides, the round shell- 

 gland in front of it ; the uterus consists 

 FIG. 172. Head of Tcenia o f a median trunk and fifteen to twenty- 



afncana ; apical surface ; mag- .. . 



nified. (After v. Linstow.) four non-rammed lateral branches on 



each side ; the embryonal shell is thick 



and has radial stripes it may be round (0-0312 0-0338 mm.) or 

 oval (0-0390 0*0338 mm.) ; the booklets of the oncospheres measure 

 0078 mm. in length (fig. 131, a). 



