GEOLOGICAL SUEVEY OF THE TEEEITORIES. 58 O 



These measurements show that this bone is considerably shorter than 

 in U. pressicornis, though of equal distal diameter. In both species the 

 measurements considerably exceed those given by Marsh for his Titano- 

 tlierium (?) anceps. The form of the articular extremities in this animal 

 differs from both in being more narrowed and transverse. 



The fibtda is larger proximaliy and smaller distally than in U. pressi- 

 coriiis. Diamet€?r proximal articular face .039 5 of the distal .045. 



The astragalus is similar in size and form to that of E. pressicornis, 

 but differs in two points. The posterior margin is deeply incised for 

 the ligamentous insertion, and the outer lobe is clearly cut to this fossa, 

 on the inner side. There is a pit for a ligament on the convexity of the 

 inner part of the middle of the tibial articular face. A third diiference 

 is seen on the inferior face. The inner calcaneal facet is longer and 

 narrower, and is margined on the inner side by a large fossa parallel to 

 its axis, which is wanting in the other species. The calcaneum is short 

 and wide ; its only anterior articulation is with the cuboid and is small. 

 The heel is deeper than long, and is obliquely truncate downwards and. 

 inwards. 



Measurements of calcaneum. 



M. 



Leugth 0.105 



AVicUh 092 



Depth in front , 056 



Length heel . 047 



Depth heel 055 



Length cuboid facet 038 



The cuhoid is a flat sub -triangular bone with two unequal articular 

 faces below. 



Measurements. 



M. 



Length 0.064 



Width 076 



Depth 031 



Length cuneiform, (antero-posterior) 040 



Depth cuneiform 017 



The humerus of a third specimen may or may not belong to this species. 

 It was found in another locality. Its condyles are much less oblique 

 than in that one described under E.pressicornis. The olecranar fossa is 

 shallower. It belonged to a larger animal. 



Measurements of humerus. 



M. 



Transverse diameter distally, (7.75 inches) , 0. 195 



Transverse diameter, inner condyle l!<!5 



BemarJcs. — The remains were discovered by the writer in the Bridger 

 Bad Lands, on South Fork of Bitter Creek, Wyoming. 



UrNTATHERiUM EGBUSTUM, Leidy. 



Proceedings Academy Natural Sciences, Philadelphia, 1872, p. 169, August. Uinta- 



mastix atrox. Leidy, 1. c. 



I have been able to examine, through the kindness of Professor Leidy, 

 the type of his description, and find it to belong to a smaller species 

 than any of those above described. The lateral parietal and supra- 

 occij)ital crests are well developed, and the latter extends obliquely 

 backwards. Several peculiarities are to be observed in the dentition. 



