CESTODA OR TAPEWORMS. 



68 



• » 



are scientifically called, Platyhelminths. They are 

 ribbon-like in appearance, and vary from minute 

 bodies barely one-sixth of an inch to many feet in 

 length. 



The typical tapeworm (fig. 19) is composed of a 



Fig. 19. 



Typical Cestode Worm. 



head or scolex, and a number of oblong segments 

 called proglottides. The scolex or head is armed 

 with suckers and hooks, and may be prolonged in 

 front into a kind of rostrum. Behind the scolex 

 comes a restricted area, the *' neck,' the region which 

 is destined to produce, by a process of budding, the 

 innumerable proglottides or segments. Each of these 

 segments is, to all intents and purposes, an individual 

 animal. The segments grow larger towards the end 



