TYPE PLATTHELMINTHEa. 



153 



ductive organs are present in several sets succeeding one an- 

 other, without any external indications of a reduplication of 

 parts. In TricBnopJiorus the multiplication of the sets of re- 

 productive organs is indicated, however, externally bj"^ indis- 

 tinct constrictions of the body, an indication of a tendency 



Fig. 81.—^, Garyopkyllmus mutabilU (after Stein) ; B, Tmnia saginata (a£ter 



Lbuckart) ; 0, anterior end of T. saginata (after Lbuokart). 



od = oviduct. ^ = vas deferens. 



ov = ovary. vi = yolk-glanda. 



t = testis. vid = yolk-duct. 



vs = vesicula seminalis. 



for the individual to separate into a number of parts, each 

 possessing a certain amount of individuality. This tendency 

 reaches its highest development in such forms as Bothrio- 

 cephalus and Tcenia (Fig. 81, B), which consist of an anterior 

 portion, the 8colex (Fig. 81, C), provided with organs of adhe- 

 sion in the form of suckers, accompanied or not by chitinous 



