Peterson: IMaterial Discovered in Uinta Basin. Ill 



tal posterior angle there is a distinctly rounded facet which fits neatly 

 into a corresponding pit-like facet just above the articulation for (he 

 astragalus. 



The high and narrow astragalus with its oblique trochlear groove 

 was pointed out by Professor Marsh in his original description. This 

 important equine feature agrees with Heptodon.a.nd is altogether dif- 

 ferent from what is seen in Paloplotherium minus and in the recent 

 tapir, in which the bone is broader, shorter, and the trochlear groove 

 more directly fore-and-aft. The articulation for the navicular is 

 more concave from side to side than in the recent genus. 



The calcaneum of Ilelaletes hoops agrees with that of Ileptodon and 

 is longer and slenderer than in the tapir. The bone as a whole, how- 

 ever, has a general similarity to that of the latter genus, except the 

 round pit-like articulation for the fibula at the base of the tiib3r calcis 

 directly dorsad, already referred to in the description of the fibula. In 

 the recent tapir, the fibula touches the calcaneum, but this facet is 

 only a rounded surface, which is more or less continuous with the facet 

 for the astragalus, and is situated on the fibular angle of the latter 

 articulation. 



A fragment of the navicular plainly indicates this bone to be pro- 

 portionally high when compared with that of the tapir. The cuboid 

 is also high and the antero-posterior and transverse diameters are 

 proportionally less than in the recent genus. The articulation for Mt. 

 IV also differs from that of Ta pirns in being single. 



The pes is tridactyl as in the tapir. This is plainly indicated by 

 the heads of the metatarsals of the right side which are all represented. 

 Mt. Ill is enlarged in an equal proportion to Mc. Ill of the manus and 

 the lateral digits, in particular Mt. II is as much, if not more, reduced, 

 than in the tapir. There is a large facet for the entocuneiform on the 

 tibial angle of the head of the latter bone, but no evidence of facets for 

 metatarsals I or V. The distal trochlea of the median digit is quite 

 symmetrical and the metapodial keel is more sharply defined than in 

 the recent tapir, but is, as in the latter, confined to the posterior face 

 of the articulation. On the whole the pes is very similar to that of 

 Heptodon from the Wind River, described by Osborn and Wortman. 



The median phalanges are broad and depressed, unlike the more 

 elongated corresponding bones of Heptodon from the Wind River, 

 while the lateral phalanges are more rounded. The phalanges as a 

 whole are suggestive of the Equidce rather more than those of the true 

 tapirs. 



