226 



UNSEGMENTED WORMS 



richly nourished, and buds off asexually a chain of 

 joints. 



As these joints are pushed by younger interpolated buds 



7'.S 



Fig. 122.- 



-Diagram of reproductive organs in Cestode joint. 

 Constructed from Leuckart. 



ov., Ovary, with short oviduct ; «/., " uterus " ; /., diffuse testes ; 

 sh.g., shell glared; y.g., yolk gland; v.d., vas deferens; 

 v., vagina ; r.s., receptaculum seminis ; I.e., longitudinal 

 excretory ducts ; I.e., transverse bridges connecting these. 



The dotted lines above and below represent the anterior and 

 posterior borders of the proglottis. Note that the so-called 

 uterus is blind ; it opens to the exterior in a few tape-worms, 

 and is perhaps the homologue of the Laurer-Stieda canal of 

 Trematodes. 



farther and farther from the head, they become sexually 

 mature. The ova are fertilised, apparently by spermatozoa 



