224 THE MANAGEMENT AND DISEASES OF THE DOG. 



sional man to realize the fact that the same entozoon in its 

 larval or vesicular state attains a size many thousand times 

 exceeding that of the parasite in its adult condition. Harm- 

 less when full-grown it is fearfully destructive to life in the 

 juvenile stages of growth. To be sure, its bad effects are 

 chiefly witnessed in the human subject ; but cattle, sheep, 

 horses, and swine occasionally perish from the presence of 

 the larvae within their vital organs. 



" The herbivorous animals and ourselves get the echino- 

 coccus disease by swallowing the eggs of the hydatid tape- 

 worm. 



" Fig. 29, A, is a representation of the parasite. It ex- 

 hibits the head-segment with its four suckers, and crown of 



Fig. 29. 

 Hydatid Tapeworm and Echinococcus Head. (Cobbold.) 



hooks (a), and three ordinary segments (^, c, d), the lower- 

 most of which is sexually mature, displaying numerous eggs 

 internally. Water-vessels traverse the entire length of the 

 worm. 



