PAROREODON 



179 



nares, that is, the frontals do not end in an apex forward, as they do in Merycoidodon, Eporeodon, 

 and certain other genera. The orbits are subround and highly situated and look mostly sideward but 

 somewhat upward. The temporal ridges join well aft, at a point above in a plane about through the 



12415, TYPE 



Y. P. M, 



Fig. 129.— Paroreodon marsAi Thorpe. Skull. GHT. Cat. No. 12415 Y.P.M. 2/3 nat. size. (After Thorpe, 1921.) 



middle of the bulla;, and are very low and less clearly defined than in most of the oreodonts. The 

 sagittal crest is very short, less than a fifth of the skull length. The supraoccipital crest is for the 

 most part missing, but it was apparently small, with the wings widespread. 



Fig. 130. — Paroreodon marshi Thorpe. Right half, inferior view of skull. GHT. Cat. No. 12415 Y.P.M. 2/3 nat. size. 



(After Thorpe, 1921.) 



12415, TYPE 

 Y. P. M. 



Fig. 131. — Paroreodon marshi Thorpe. Right half, superior view of skull. GHT. Cat. No. 12415 Y.P.M. 2/3 nat. size. 



(After Thorpe, 1921.) 



The brain case is relatively enormous, with the postorbital constriction much less marked than 

 is that of any contemporary merycoidodont of similar size. The external auditory meatus is situated 

 about as in Ticholeptus, lies close to the base of the paroccipital process, and is somewhat upwardly 

 and backwardly directed. The palatonarial border lies behind M 3 , and the palate is wide and 



