Ternnocyon and (Hypotemriodon .— 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 has 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 
yary with the same irregularity as in the type species, in the 
former measuring 37 mm. in width or height from under 
pTT to mTI, and in the type 25 mm. at pT to 30 at mTi. The base 
?of mT2 is some 5 mm. above the base of mTi, but in the type it 
is in the same line with mTz. 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. 
1906) must be eliminated from this present part and will be 
hereafter described under the new genus Hy potemnodon (No. 
% p. 321). 
Measurements. 
{T.ferox.) 
Width across the presp. pterog. 
25 mm. 
the frontal 
59 
between orbits (least) 
46 
“ bases of canines 
18 
T. altigenis 18 
“ apices of paraocc. 
65 
foramen magnum 
30 
occiput (above) 
50 
between ms 1 
24 
T. altigenis 38 
of palate 
58 
“ 65 
Tensth of pm-m series 
94 
“ 77 
, true molars 
26 
“ 21 
Total length 
266 
of dentition 
128 
T. altigenis 97 
The Dentition .—In the superior dentition of T.ferox (fig. 
, f 2) the largest incisor is more or less rounded at the apex and 
mot so acutely pointed, the base development more robust and 
the tooth more erect 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 
isize in the several species, although this variation is irregular 
and does not conform to the variation in size of thecraniums. 
