82 



THE MERYCOIDODONTID/E 



a gentle transverse supraorbital convexity, and they extend forward of the lacrimals. The orbits are 

 large, with the vertical diameter the greater, and they look but very slightly forward. The temporal 

 ridges unite well aft on a line nearly over the anterior part of the postglenoid processes. The 



Fig. 41. — Eporeodon occidentalis (Marsh). Skull. GHT. Cat. No. 101+2 Y.P.M. 3/5 nat. size. 



(After Thorpe, 1921.) 



sagittal crest is low and short, slightly more than a fourth of the length of the skull. The supra- 

 occipital crest is moderately produced and has widespread wings. The brain case is well developed, 

 with prominent convexities. The external auditory meatus is large and tubular and mainly directed 

 upward but with a slight backward slant. The palate is wide and gently concave, with the V-shaped 



10142, TYPE 



Y. P. M. 



,i \m 



Fie. 42. — Eporeodon occidentalis (Marsh). Right half, inferior view of skull. GHT. Cat. No. 10142 Y.P.M. 



3/5 nat. size. (After Thorpe, 1921.) 



Fig. 43. — Eforeodon occide?italis (Marsh). Right half, superior view of skull. GHT. 



3/5 nat. size. (After Thorpe, 1921.) 



Cat. No. 10142 Y.P.M. 



palatonarial border on a line with the last molars.- The inclination of the basicranial axis is slight. 

 The bulls are large and laterally compressed. The glenoid articular surface is convex. The post- 

 glenoid process is stout and is not externally oblique, and it bounds about half of the articular sur- 

 face. The paroccipital process is slender, with the transverse diameter the greater, and is almost at 

 right angles to the sagittal plane. Index: 0.62. 



