390 Miscellaneous. 



the lower extremity of the humerus, and the upper extremity of the 

 ulna and radius of the right leg were also disclosed. 



The top or vault above the orbits, and posterior part of the cranium, 

 are wanting, as are also the ossa nasi, ossa intermaxillaria, the part of 

 the os maxillare inferius just anterior to the commencement of the 

 symphysis, and the zygoma of the left side, but sufficient is left to 

 characterize it as a remarkable genus of Ruminantia, very different 

 from any that has been heretofore described. 



The cranium belonged to a full-grown or adult animal, but not an 

 old one, as is indicated by the teeth. 



In the upper jaw are seven molars, differing in this respect from 

 any ruminant known, living or fossil. The posterior three molars, 

 usually called true, present nothing very peculiar in their conforma- 

 tion. They are not so square as in Cervus, but are more like those 

 of Ovis, being much broader than wide, so that they have a compressed 

 appearance. The four crescents upon the crowns are quite simple. 

 Externally these teeth present two and nearly plane surfaces, sepa- 

 rated by an abrupt, salient, longitudinal ridge on a line with the 

 notch separating the anterior and posterior pair of columns. Each 

 of these surfaces has a longitudinal rounded ridge, more prominent 

 upon the anterior than the posterior one, but neither so salient as 

 the first. The antero-external border is also elevated or prominent, 

 so that each of these teeth presents externally four longitudinal ridges. 

 As is usual, these teeth are obliquely situated in the jaw, and the 

 anterior part of one folds over externally, or overlaps the posterior 

 part of the one preceding it. 



The anterior four molars or premolars are not more than half the 

 length of the true molars, and differ among themselves so as to render 

 it necessary to examine them separately. The posterior or fourth 

 premolar has more the characteristics of a true molar, and it would 

 probably not be wrong to consider it as an additional true molar. 

 The crown presents four crescents, which are thicker than in the 

 true molars, and the anterior and posterior pair are separated by a 

 comparatively deeper notch. Externally the tooth has four ridges 

 corresponding to those of the true molars. The third premolar, or 

 the one immediately preceding the last, has upon its crown a pos- 

 terior pair of thick crescents, and an anterior cusp which has the 

 appearance of being formed by the blending together of a pair of 

 crescents. Externally it is trilobed, the lobes being separated by 

 two concave depressions. It is shorter, but broader, than the last. 

 The second premolar is compressed, faintly trilobed, and presents an 

 elongated trenchant crown. The first premolar is the most remark- 

 able characteristic of this cranium. It is separated from the others 

 by a concave notch of - 833 of an inch, and is on a line with the an- 

 terior mental foramen. It is implanted in the jaw by two fangs, 

 which are divergent and placed one anterior to the other. The body 

 is nearly as broad as the second premolar and is of a compressed py- 

 ramidal form, and the crown has a trenchant edge, the posterior and 

 anterior part of which form an angle about its centre. 



In the lower jaw, in the specimen, are six inferior molars in a 



