51 



of a cranium, discovered by Dr. Carter in the buttes of Dry Creek Canon. 

 The specimen was broken into many pieces, but these have been united so 

 as to give its a good idea of the shape and construction of the cranium. This 

 is of remarkable form, and exhibits more resemblance to that of a bear than 

 to that of its nearer relative the tapir. 



The forehead, as seen in the upper view of the cranium, Fig 16, Plate 

 XXIII, forms a long triangle, with the apex prolonged backward and expanded 

 at the summit of the occiput. Its fore part more abruptly widens as it extends 

 outwardly upon the conspicuous postorbital processes. Its surface from the 

 apex forward is strongly convex, but approaching the muzzle between the 

 position of the postorbital processes it becomes in the same direction con- 

 cave. Transversely it is nearly straight between the boundaries of the tem- 

 poral fossae, but is convex between the postorbital processes. The latter 

 are strong and unusually prominent, trihedral, hook-like projections. Their 

 upper acute border forms the anterior extension of the temporal boundary 

 from the forehead. Their supra-orbital margin curves from the face back- 

 ward and outward to the point. Their anterior or facial surface is depressed 

 or concave. 



The postorbital process preserved in the specimen is broken at the end, 

 but is there so narrow as to make it appear that it did not meet an ascending 

 process from the malar bone as to form a postorbital arch. The strongly 

 arched supra-orbital border is directed outward with a moderate backward 

 inclination, indicating a more forward direction for the orbit than in the tapir 

 and rhinoceros. 



The short postorbital eminence of the malar bone in the facial specimen 

 referred to Palceosyops paludosus, and represented in Fig. 51, Plate XVIII, 

 would also indicate that the orbits were open behind in Palaeosyops, notwith- 

 standing the great length of the postorbital process of the frontal in the 

 specimen under consideration. 



The base of the muzzle, or the face, between the position of the orbits is 

 broad and convex. 



The specimen exhibits no evident traces of the sutural conjunctions of the 

 parietals, frontal, the maxillaries, and the nasals. 



The cranial crest separating the temporal fossa? is exceedingly short com- 

 pared with that of the tapir. It is formed by the approach of the temporal 

 boundaries, which appear in this position as two obtuse ridges squeezed 



