THE ANIMAL KINGDOM. 17 



they have been discovered at a depth of more than 12,000 

 feet, where they had to support the enormous pressure of 

 375 atmospheres, a pressure capable of bursting a cannon, 



6. The Hydrostatic Physophora : Physophora muzonema. 



but which the gelatinous body of a microscopic animal re- 

 sists in some marvellous way. 



These living corpuscles, which swarm in the transparent 



