1016] 



Chandler: Notes on Capromeryx 



119 



appreciably different from the condition in the pronghorn. The groove 

 for the ulna on the posterior side is very conspicuous, and the proximal 

 articular surface is not so much expanded as in Antilocapra. No ulna 

 has yet been recovered. The tibia is considerably more slender than 

 is that of Antilocapra, and is a little more nearly circular in cross- 

 section than is that of the Recent species. 



A large number of metapodials have been found, including a 

 number of complete ones, the great majority, however, being from the 

 hind limb. In the anterior metapodials the groove on the anterior 

 face is very slight, in fact almost obsolete, but the posterior groove is 

 both broad and deep, much more conspicuous than in Antilocapra. 

 The posterior metapodials were fully described and figured by Taylor. 2 



A considerable number of well-preserved astragali and calcanei have 

 been found, although other ankle and wrist bones have not certainly 

 been identified. 



The new series of astragali show that the specimen upon which 

 Taylor based his description was somewhat worn, and that this caused 

 him to draw some erroneous conclusions. The knob on the inner side 

 of the central dorsal fossa is fully as well developed as in Antilocapra, 

 and more so than in Ilingoceros. The groove on the dorso-proximal 

 articular surface is more pronounced than in Ilingoceros, and this 

 articular surface swings around ventrally farther than in Ilingoceros, 

 in both these respects approaching Antilocapra. The central dorsal 

 fossa is smaller and deeper than in either of the other genera mentioned. 

 Between the knob described above and the anterior articular surface 

 there is no deep groove as there is in Antilocapra, this condition 

 agreeing with that in Ilingoceros. A further similarity to the latter is 

 shown in the contour of the distal end, where the trochlea is distinctly 

 rounded and the sides tend to become flattened as in the cervid type. 

 The proximal trochlea is narrower and deeper than in the other genera. 

 The projection on the inner proximo-ventral angle is nearer to that 

 of Antilocapra, while the whole distal half of the outer aspect, and 

 the groove into which the calcaneum fits on the ventral side are more 

 suggestive of Ilingoceros. 



The calcanei, some perfect specimens of which are at hand, tend 

 to corroborate the evidence given by the astragali, that Capromeryx 

 is in some respects nearer to Ilingoceros, but in most characters ap- 

 proaches more closely to Antilocapra. The groove on the inner surface, 

 adjacent to the articulation with the cuboid, is very distinct, and has 



2 Op. cit. 



