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COPE 



The time-histories of the orders of reptiles are represented 

 in the accompanying table : 



The order Ootylosauria includes reptiles with amphicoel- 

 ous vertebrse and of terrestrial habits. There are four families, 

 the Pariasauridee, of robust form varying from the size of an 

 alligator to that of a cat, from the Permian beds of South 

 Africa and North America; the Diadectidse (Fig. 17), with 

 hyposphen-hypantrum vertebral articulation, and teeth 

 with robust, molariform crowns, transverse to the jaws, from 



