PLATYHBLMIA 



57 



When it is introduced into the stomach of the dog the cyst 

 is dissolved and the young tapeworm fastens itself to the 

 intestine, and the bladder part being discarded, it proceeds 

 to grow into a tapeworm. 



The area of attachment of the tapeworm to the intestine 

 is tumified and the cells altered. The tapeworm, besides 



Cup 



Hooks 



Scolex 

 \Sucker 



Vesicle 



FIG. 26. Cysticercus of Taenia serrata from its gallery in the liver of the 

 rabbit, and the more mature cysticercus (C. pisiformis) from its cyst in 

 the peritoneal cavity of the rabbit. 



imbibing the food of the host, liberates secretions which have 

 a poisonous effect, and when they are present in large numbers 

 the effects may be serious. In the cysticercus or the corre- 

 sponding stage, the effects on the intermediate host may be 

 very great, especially in the case of compound larvae, as 

 Coenurus in the brain of the sheep, and Echinococcus larvae, 



