300 ANIMALS IN INLAND WATERS 



refuge from heat and from enemies and find their hunting grounds in 

 the water are amphibious, living periodically out of water; these have 

 a striking similarity in that they can immerse their bodies in the water 

 up to the nostrils and eyes (Fig. 81). The soft-shelled turtles (Triony- 

 chidae) have their nostrils situated at the end of an elongate snout, 

 so that they compare rather with Nepa and Ranatra than with other 

 aquatic reptiles. One of the primary distinctions between the animal 

 communities of fresh waters and those of the sea lies in the great pro- 

 portion of such terrestrial invaders of the inland waters. 



BIBLIOGRAPHY 



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