TJZNIA SOLIUM. 



181 



this remains quiescent, and without power of further develop- 

 ment, unless the pig be eaten by some other Vertebrate. 



When man unwittingly eats " measly " pork, that is pork 

 infested with bladder -worms, an opportunity for further 



r.s 



:l: 



FIG. 87. Diagram of reproductive organs in Cestode joint. 

 Constructed from Leuckart. 



'., Ovary, with short oviduct; ut., "uterus"; t., diffuse testes 

 sh.g., shell gland ; y.g. , yolk gland; ?/.</., vas deferens; r., 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. 



development is afforded. The bladder is lost, and is of no 

 importance, but the "head" or scolex fixes itself to the wall 

 of the intestine. There it is copiously and richly nourished, 

 and buds off asexually a chain of joints. 



