TKANSMiaRATIONS AND METAMORPHOSES. 



205 



to live and move about in tlie water. Those of beasts of 

 prey are entirely different ; it is by means of the prey 

 that they enter their hosts. Each carnivore has its own 

 worms, as it has its own prey which introduces them. 



Fig. 47. — Amphistomum sub- 



FiS". ^.—Polystomum 

 integerrimum. 



clavatum of the frog. 



Independently of these worms, the vegetable-feeders 

 afford lodgmg to some which are not theii' own. 



