NEW GENUS AND SPECIES OF THEROMORPHA 559 



Ophiacodontidae 



Ophiacodon Marsh 



Theiropleura Cope 

 Poliosauridae 



Poliosaurus Case 



Varanosaurus Broili 



Varanops Williston 

 PMycterosaurus Williston 

 PArribasaurus Williston 

 Edaphosauridae 



Edaphosaurus Cope 

 Caseidae 



Casea Williston 



Together with Trichasaurus Williston, Scoliomus Williston and 

 Case, Poecilospondylus Case, Glaucosaurus Williston, Elcobresaurus 

 Case, of more doubtful position, these are all that can be definitely 

 located among the American Theromorpha, that is zygocrotaphous 

 reptiles, with the temporal vacuity below the squamoso-postorbital 

 arch. Ostodolepis Williston is a synonym of Pantylus Cope. 



