SCOLECIDA. 



115 



follows this is really jsroduced by a process of budding from the 

 head. The head contains no reproductive organs, and is not fur- 

 nished with a mouth or digestive organs of any kind, its nutrition 



Fig. 72. — A, Tcenia solium, of the natural size : a " Head" or " nurse ; " & One of the 

 proglottides from the sexually mature part of the worm. B, A single mature pro- 

 glottis of the same, showing the genital pore (p) and the Ijranched uterus (u). 



being entirely effected by imbibition of the nutritive fluids elaborated 

 by its host. A nervous system, in the form of two ganglia, united 

 by a transverse commissure, and sending filaments backwards, is 



