Peterson: Material Discovered in Uinta Basin. 77 



some way got mixed with the limb- and foot-bones of Diplobunops; 

 the second is that possibly the present new genus and the protoreodonts 

 possessed a dentition more closely similar in structure than might have 

 been anticipated. 



The upper dentition is almost completely demolished in the speci- 

 men under consideration. However, a few important characters are 

 ascertainable. The alveolar border is longer than in the type of 

 Protagriochcenis anftectens, which is due to the relatively longer pre- 

 molar region, a character which suggests Diplohune. The root of the 

 upper canine indicates that it is like the same tooth in Protagriochcerus, 

 but F- is more isolated and recalls the condition in some species of 

 Agriochcerus. The inner portions of M- and M- are preserved and 

 show that the postero-internal crescents have more acute angles on 

 the inner face than in Diplohune and thus are more like these teeth in 

 ProtagriochKriis, and also that the intermediate tubercle (protoconule) 

 is smaller than in the European genus. 



Although the mandible of Diplobiine is longer and slenderer, the 

 premolars longer and better developed behind than in the present 

 specimen, there is a surprising similarity in the dentition of the two 

 forms, so far as comparison can be made by means of the material 

 at hand. While the internal tubercles of the molars are grooved on 

 the inner face, I judge that the anterior internal tubercles were not 

 twinned, at least not to the same extent as those in Diplobiine. In the 

 latter genus the inner faces of the molars are less rugose than in the 

 specimen under description, while in some species of Protoreodon 

 this feature appears to be similar to that in Diplobunops. M- has a 

 well developed fifth cusp as in Diplobiine and in the Oreodonts 

 generally. 



The distal end of the scapula has a general resemblance to that bone 

 in Diplobtme. The distal end of the humerus has the same low and 

 broad anconeal fossa, the large entepicondyle, the broad trochlea 

 with the great convexity of the intertrochlear ridge, and the sharp 

 and well defined external ridge, which articulates with a corresponding 

 facet of the radius. The latter has an expanded head as in Diplohune. 

 The ulna is short and stout, with a remarkably short and heavy 

 olecranon process. 



The material at hand clearly indicates that the carpus is lower and 

 relatively broader than in Diplohune. The scaphoid is broader, but 

 the antero-posterior and vertical diameters are less, and the distal 



