124 
CEEODONTA 
molar. There are two mental foramina; one issuing opposite to the first, 
the other opposite to the fourth premolar. The inferior border of the 
ramus is convex in the antero-posterior direction, and is not inflected below 
the masseteric fossa. This fossa is deeply excavated, shallowing gradually 
downward and outward. 
The canine tooth is large, compressed, and directed forward, judging 
by the character of the alveolus. The first premolar is broken at the 
alveolus; it was small, one-rooted, and directed forward. The other pre¬ 
molars are two-rooted. A marked character of the species is the relatively 
small size of the first true molar, or the tubercular sectorial. Its length 
antero-posteriorly equals that of the third premolar, and is less than that of 
the fourth premolar. All the premolars excej^t the first are characterized 
by the presence of an obtuse lobe on the posterior cutting-edge, which is 
quite prominent on the- third and fourth; these two have also a prominent 
anterior basal tubercle. The posterior part of these two p^’emolars is 
widened, so as to form a kind of heel, the posterior tubercle standing on 
the outer side, the cingulum-like heel extending round behind it, and termi¬ 
nating- in a narrow basal cingulum which extends on the entire outer side. 
The heel is most fully developed on the fourth premolar, where it supports 
a small tubercle behind that of the outer side. The tubercular sectorial is 
distinguished from the premolars by the great difference between the eleva¬ 
tions of the anterior and posterior portions. The three cusps which 
constitute the former unite into a triangular mass at their bases. The inner 
and outer are opposite to each other, the inner the less elevated; the anterior 
is at the inner side, and is intermediate between the others in elevation, and 
forms the sectorial blade with that of the outer side. The posterior side of 
the united bases of the internal and external cusps is transverse and smooth. 
The heel is large, has a raised border and concave crown; the outer border 
forms an obtuse blade and is directed obliquely inward. There is a faint 
cingulum on the external base. The tubercular is composed of the same 
elemental cusps as the tooth preceding it, but differently proportioned. 
Thus the anterior three cusps are small, occupy a small part of the crown, 
and are not more elevated than the posterior raised border of the heel. 
The latter is elongate, and supports on the outer side an oldique cutting 
