SQUAMATA 



147 



direct ancestors of the strictly marine mosasaurs; and scarcely 

 a doubt that they were the descendants of the actual forbears 



.S.W.W, 

 1910 



Fig. 68. — Clidasles, an American mosasaur. Life restoration 



of the modern monitors, which, as we have seen, have acquired 

 partial aquatic habits in escaping from their enemies. The 



