TJZNIA. 



239 



89), which measures as much as 30 feet in length. In all of 

 these varieties below the head is a thin constricted neck, which 

 develops gradually into broad, flattened, connected segments, 

 or proglottideS) each of which contains male and female sexual 

 organs. The links or segments of the T. saginata are larger 

 and not nearly as equilateral as those of the T. solium, which 

 measure, when mature, about 1 c.m. long and 8 m.m. wide, 

 the links of the T. saginata being more the shape of a key- 

 stone. The head of the T. saginata is provided only with 

 suckers, while the T. solium has, besides the four suckers, an 



FIG. 87. 



Tsenia cucumerina: Head; proglottis ; magnified (von Jakscb). 



armature of hooklets. The uterus of the T. saginata has many 

 lateral branches (15-30), while the T. solium' has fewer (10- 

 20). The uterus of the Bothriocephalm latus is dark and 

 small and located in the centre of the segment, which at 

 maturity is nearly square. 



The head of the bothriocephalus is characterized by two 

 grooves in its side, which are probably suckers. The head is 

 oblong in shape. 



It takes about three to three and a half months for the seg- 

 ments of the T. saginata to appear in the faeces after infection 



