Zoology. Q77 
externally or overlaps the posterior part of the one preceding it. 
crown presents four crescents, which are thicker than in the true mo- 
lars, and the anterior and posterior pair are separated by a compara- 
crescents, and ior cusp which has the appearance of being 
rmed by the blending together of a pair of er ts. Externally 
itis trilobed, the | being separated by two concave depressions. 
pressed, faintly trilobed, and presents an elongated trenchant crown, 
The first premolar is the most remarkable characteristic of this crani- 
um. It is separated from the others by a concave notch of ‘333 of an 
inch, and is on a line with the anterior mental foramen. It is implant- 
ed in the jaw by two fangs, which are divergent and placed one ante- 
nior to the other. The body is nearly as broad as the second premolar 
and is of a compressed pyramidal form, and the crown has a trenchant 
edge, the posterior and ‘anterior part of which form an augle about 
ils centre. ; 
In the lower jaw, in the specimen, are six inferior molars in a closed 
row commencing ‘25 of an inch anterior to the corresponding six mo- 
lars above, and continuing as far back as the latter. Besides these, 
tior to the commencement of the symphisis posteriorly, is one half of 
an alveolus for an additional or seventh molar, which, when the Speci 
men was first received, contained a portion of a fang, since mislaid. 
This additional molar in the lower jaw, is possessed by only one other 
— genus of Ruminantia; the Dorcatherium, of Kaup. 
tom th ; 
that in the possession of a seventh molar in the upper jaw, in the posi- 
tion of the molars, and in several other minor peculiarities, this genus 
