782 THE WHITE EIVEE FAUNA. 



hypapophysial nor any other longitudinal ridges. The costal articular 

 surface is single and uninterrupted. 



These vertebrae resemble very much those of the Erycid genus Ckarina, 

 which is found at the present time in the Pacific district of this continent. 

 I can, in fact, detect no well-marked generic difference between them. The 

 zygosphen of the recent species is somewhat narrower than that of the ex- 

 tinct one. 



Aphelophis talpivorus Cope. 



Locis eitatia. 

 Plate LX ; fig. 21. 



Vertebrae short and wide ; the neural spine stouter and more obtuse 



than in any other species here described, occupying less than half the neural 



arch with its basis. Zygosphene wide, depressed, with nearly straight 



posterior margin, not sending any ridge backward from the posterior face. 



Articular faces of centrum depressed oval ; ball looking upward, its axis 



making 45° with that of the centrum. Parapophysis not projecting below 



centrum. 



Measurements. 



H. 

 Length of centrum 0.0026 



Diameter of cup ^*'^'*°8^"^« ^^^ 



I vertical 0012 



Width between parapophyses 0017 



Depth of entire vertebra 0034 



Width of zygosphene . 0020 



Represented by three vertebrae of an individual about the size of Cal- 

 amagras murivorus. 



The White River epoch of Northeastern Colorado. 



OGMOPHIS Cope. 



Neural spine of vertebra short and obtuse. No process below the pre- 

 zygapophysis. Rib surface single, uninterrupted; rib extending posteriorly 

 from its inferior extremity. Inferior face of centrum without hypapophysis 

 on the dorsal region, but probably furnished with one on the cervical region. 



This genus resembles Aphelophis in most respects, and probably has 

 similar general affinities. It is distinguished by the ridge which extends 

 from the parapophysis, and the groove which is included between this and 

 the middle line of the centrum. Two species are known to me. 



