SQUAMATA 



'47 



direct ancestors of the strictly murine mosasaurs; and scarcely 

 a doubt that they were the descendants of the actual forbears 



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



of the modern monitors, which, as we have seen, have acf|uired 

 partial aquatic habits in escaping from their enemies. The 



