588 THE BRIDGER EPOCH. 



Marsh, is about the size of the U. rohustum, but differs from it in the 

 absence of a tubercle on the last molar. I therefore retain three species, 

 as follows: Uintatherium robustmn Leidy, (J. mirahile Marsh, TJ. lacustre 

 Marsh. For convenience I compare these species with those of Eohasileus. 



The naso-maxillary horn-cores have been seen in E. furcatus and 

 U. mirahile, and the nasal tubercles in the same. The posterior horn-cores 

 ^re known in the U. mirabile. The posterior and lateral crests of the 

 cranium inclose a basin-shaped concavity above in all these speeies. It has 

 been observed in all but E. pressicornis. The dentition is similar to that in 

 Loxohphodon, i. e., I. 0; C. 1; Pm. 3; M. 3. The first premolar in U. 

 lacustre has an internal cone and outer concave crest. The worn surfaces 

 of the other teeth in that species, U. rohustum and U. mirahile, are nan-ow 

 ovate, with a deep exterior emargination. The true molars support two 

 crests, which converge inward and unite with a small tubercle behind the 

 apex in U. lacustre and U. rohustum. The tusk is long, compressed, and 

 double-edged, as in Loxohphodon. The last inferior molar in U. rohustum 

 possesses three transverse crests, the posterior two parallel, and obliquely 

 directed inward toward the axis of the anterior, which is the highest. 



In a specimen of one of the smaller species the idna widens consider- 

 ably distally, being nearly as wide as the much- expanded olecranon. The 

 latter is large, flflttened, and subtransverse, and presents a sharp ridge 

 internally. On the inner side of the distal part of the articular face for the 

 humerus is a tubercle, from which a short, wide groove runs out on the 

 inner face of the bone. The head of the radius is a little exterior to the 

 middle line, and the shaft crosses the ulna in an open, shallow groove, to 

 the inner side. 



The cuboid is flat, and displays two proximal and two distal articular 

 facets in an undetermined species described below. The astragalus of the 

 same species is subbifurcate posteriorly, and has internally an extensive 

 oblique malleolar fossa. The calcaneum is short and massive, with two supe- 

 rior and one small anterior articular facet. 



The species, including Eohasileus furcatus, may be thus distinguished : 



1. Large species (occipital condyles extending over about M. 0.170.) 



Nasomaxillary horns long; posterior liorncores flat, elevated E. furcatus. 



