Temnocyon and Hypotentnodon. — Eyerman. 269 
•latter species (65 mm.). This comparison applies also to T. 
wallovianus Cope (No. 1, p. 905) which, although a smaller 
species than the type itself, still lias a slightly greater palate 
diameter than even T.ferox. 
In the living C. familiar is of equal size we find this diame- 
ter equivalent to the proportions exhibited in T. altigenis. 
The mandibular ramus of T.ferox in height or width does not 
vary with the same irregularity as in the type species, in the 
former measuring 37 mm. in width or height from under 
pTf to m7~i, and in the type 25 mm. at pTT to 30 at mTl. The base 
:of m72 is some 5 mm. above the base of mTl, but in the type it 
is in the same line with m72. From these measurements it 
would seem that the ramus of T.ferox is proportionately not 
iso great as the size of the species would indicate. 
Note. Comparisons with Cope's T. coryphaeus (No. 1, p. 
906) must be eliminated from this present part and will be 
thereafter described under the new genus Hypotentnodon (No. 
% p. 321). 
Measurkmknts, 
(T. 
ferox. 
) 
Width across the presp. pterog. 
25 
mm . 
the frontal 
.7.1 
between orbits (least) 
1(1 
" bases of canines 
18 
T. 
altigenis 
1 S mm . 
" apices of paraocc. 
05 
foramen magnum 
30 
occiput (above) 
50 
between ms i 
24 
T. 
altigenis 
38 mm. 
of palate 
58 
<;r> 
Length of pm-m series 
91 
2d 
:. 
77 
true mi ihus 
21 
Total length 
266 
of dentition 
128 
T 
. altigenis 
97 
The Dentition. — In the superior dentition of T.ferox (fig. 
2) the largest incisor is more or less rounded at the apex and 
not su acutely pointed, the base development more robust and 
the tooth more erecl than in the type species in which the 
tooth curves backward almost to the point of joining the ca- 
nine. The canines are about twice the size of those of the 
type, the bases more robust and the apex less pointed. 
The first and second premolars are simple teeth varying in 
size in the several species, although this variation is irregular 
and does not eon For in to the variation in size of the craniiinis. 
