105 



the specimen, the femur in its entire condition has evidently resembled that 

 of the elephant more than it does that of the perissodactyles. 



The mutilated distal end of a femur, represented in Fig. 5, is also supposed 

 to belong to Uintatherium, though it did not pertain to the same individual as 

 the preceding specimen. It was found in the same locality, but at a distance 

 from the former, and was derived from a different stratum, as it has an adher- 

 ent friable sandstone matrix, while the other has an adherent indurated clay 

 matrix. It is considerably smaller than the corresponding part of the femur 

 of the elephant, and is very different in anatomical character. It is propor- 

 tionately less thick. The shaft above the articulation, on the front and at the 

 sides, presents a continuous transverse convexity, without any depression 

 whatever above the position of the trochlea. The posterior surface in the 

 same direction, between the position of the low epicondyles, is concave. 



The loss of part of the outer condyle prevents a comparison of breadth 

 with the inner one, but this is more prominent posteriorly than the former. 

 The trochlea is shallow and but feebly prominent anteriorly in comparison 

 with that in the elephant. Its articular surface is continuous with that of 

 the inner condyle, and also that of the outer one, so far as it is preserved in 

 the specimen, without the slightest definition. The intercondyloid notch 

 commences at the bottom of the trochlea and gradually widens backward and 

 upward with a curve outward. 



The length of the fragment of the femur is 6£ inches. The breadth be- 

 tween the epicondyles is about 5£ inches ; the thickness of the inner condyle 

 and trochlea together is 5 inches, and the depth of the trochlea along its 

 groove is 2£ inches. 



Several large tarsal bones, found together on the buttes to the west side of 

 Dry Creek Canon, may perhaps belong to Uintatherium. They consist of a 

 calcaneum, astragalus, and cuboid bone of the left foot, and fit well enough to- 

 gether to have belonged to the same individual. In form and proportions, 

 though somewhat peculiar, they more nearly resemble those of the mastodon 

 and elephant than of other known animals. 



The calcaneum, of which an upper view, half-size, is given in Fig. G, 

 Plate XXVI, is remarkable for its short robust character. The tuber calcis, 

 in comparison with that in the ordinary proboscidians, is very short. The 

 breadth of the tuber exceeds its length, and the depth exceeds the breadth. 

 The thickened extremity narrows below and is continuous with the thick 

 longitudinal plantar ridge. The upper part of the tuber inclines nearly 

 14 G 



