190 



WATER REPTILES OF THE PAST AND PRESENT 



probability they will be discovered there when the Triassic deposits 

 of that continent have been better explored for fossils. In the 

 Rocky Mountains, especially, their remains are widely scattered, 

 they have been found in many locahties in Wyoming, Colo- 

 rado, Oklahoma, Utah, and New Mexico. Though for the most 

 part their known remains from these localities are yet fragmentary, 

 not less than four distinct genera have been described from these 



Fig. 94. — ^Dorsal vertebrae of phyto- 

 saur: az, anterior zygapophysis; /iz, pos- 

 terior zygapophysis; d, c, articulations 

 o£ rib. 



Fig. 95. — Scapula and coracoid of 

 Rutiodon carolinensis, an American phy- 

 tosaur. (After McGregor.) 



regions: "Belodon," Angistorhinus, Paleorhinus, and Episcepo- 

 saurus. From the CaroHnas and Massachusetts a single genus, 

 though described under numerous names, has been made known, 

 originally called by Emmons Rutiodon {Rhytidodon) . And from 

 Europe and India at least as many more different genera are known. 

 All these genera are, however, so closely alUed that they are placed 

 in the single family Belodontidae. 



