riERODON AFlllCANUS. 
221 
antoro-postcrior. There wore tliree small incisors crowded together so as to form nearly 
a vertical row ; the smallest alveolus is on the actual edge of the alveolus of the canine. 
2:]-8 
8-G 
5‘5 
5-8 
5-7 
2 app. 
2*7 app. 
Width. 
11 
13 
13 
10 
14 
17 
C. 10192. Anterior part of a much-crushed skull in which pm. 2-4 and in. 1 are preserved on the 
right side and pm. 3-4: and m. 2 on the left (text-fig. 69). On the left side the upper 
portion of the muzzle is preserved about as far back as the anterior border of the orbit, 
from beneath which a strong ridge, probably continued from the zygomatic process, runs 
forwards on the side of the face, terminating just behind the large antorbital foramen 
{ao. f.), which is situated above pm. 3. The snout seems to have been broad and massive, 
and contracts a little in width just behind pm. 2, but the whole is greatly fractured, so 
that it is not possible to be sure of its original form. The anterior part of the palate is 
concave from side to side and there is a pair of large anterior palatine (incisive) foramina 
[a.p.f.), elongate-oval in form and apparently situated between the canine alveoli. All 
the incisors and the canine are wainting, and their alveoli so crushed and imperfect that 
nothing can be said about them. Pm. 1 seems to have been a small, perhaps one-rooted 
tooth. Of pm. 2 the hinder half is preserved on the right side ; it had a high laterally 
compressed conical crown, probably somewhat curved backwards, and there were two 
roots. Pm. 3 consists mainly of a high laterally compressed cusp ; it is narrower 
anteriorly than posteriorly, there being a slight prominence at the postero-internal angle. 
There is a small tubercle on the hinder slope of the main cusp near its base, and this tooth 
has twm roots. Pm. 4 is much larger : it consists of a high conical backvvardly-sloping 
cusp, connected with the hinder edge of which is a short cutting-talon ; on its inner 
anterior side there is a small keel-like prominence borne on a separate root; there are 
three roots in all, two anterior and one posterior. M. 1 is a large triangular tooth ; it 
consists of a large pointed main cusp, obscurely divided into two by a shallow vertical 
groove, and connected antero-internally with a small but distinct cusp borne on a separate 
root. On the antero-external face a small cusp apparently represents the parastyle, and 
posteriorly there is a large trenchant talon, the cutting-edge of which is on its inner side. 
M. 2 is similar to rn. 1 in structure, but larger. M. 3 cannot be made out, but it must 
have been a small tooth. The antero-internal angles of the first and second molars project 
The dimensions (in centimetres) of this specimen arc : — 
Total length of the specimen, so far as preserved 
Length of the symphysis 
Ueptli of the ramus opposite the hinder end of the symphysis . 
,, „ beneath m. 2 
,, ,, ,, .3.......... 
Transverse diameter of the canine alveolus 
Antero-postorior diameter of the canine alveolus 
The dimensions (in centimetres) of the teeth are : — 
Length. 
p>m. 2 2'3 
pm. 3 2'6 
pm. 4 2’6 
m. 1 2-1 
m. 2 2-8 
m. 3 3'4 
