BHYNCHOCEPHALIA. 



187 



geneni differ very little from the existing Sphenodon of N-\\ 

 Zealand. One genus (Champaosaurus) comprising comparati\ <-lv 

 large animals from the uppermost Cretaceous of North America, 



au<l the lowest Hoc-mi' both of North America and western 



FIG. 115. 



Naosani-us clariger; restoration of dorsal vertebra, anterior aspect, one-sixth 

 nat. size. Permian; Texas, cf., centrum. (After Lydekker. ) 



Europe, was adapted to an aquatic existence and had a crocodile - 

 like snout. Unlike Sphenodon, none of these extinct forms 

 have a humerus exhibiting both entepicondylar and ectepicondy- 

 lar foramina or grooves. 



Hyperodapedon (fig. 116). A very stout reptile of large size. The 

 massive skull is short and brood, and triangular in form, with a very 

 short rostrum formed by the downwardly-curved, slender toothless pre- 

 niuxillro. The sutures between the various bones have not yet been deter- 

 mined, but those indicated in the accompanying fig. 116 seem to be 

 distinguishable. No pineal foramen can be observed in the only known 

 specimen, and there is no bony bar or septum between the external n.ue>. 





