212 



ANIMALS OF LAND AND SEA 



India and China, live curious dolphins from live to eight feet 

 long, and in South America also sea-cows. Seals occur in 



1 



Figs. 636-648. Rotifers, Nematodes, and Tapeworms. 

 For explanations of the figures see pp. xxxi, xxxii. 



several lakes in Asia. Porpoises are sometimes found far from 

 the sea in rivers. 



The fishes, of course, all are related to each other, but in 

 fresh water there are some distinctive types. The strange 

 dipnoi or air breathing fishes all live in rivers, in Australia, 



