210 
CORYPHODOK 
fourth premolar is large in the transverse direction, and rather narrow. 
Its inner crescentic ridge is well developed, and the basal cingulum is 
strong, passing round the inner extremity. A second premolar is similar, 
excepting that the length is greater in relation to the width (transverse). 
The premolars are more rugose than the molars, and have an external basal 
cingular line of rugosities. The superior canines have huge roots and 
small crowns, of a subtriangular section. An incisor tooth is remarkable 
for its large size, and the transverse as compared with the vertical extent 
of its crown. The base of the crown exhibits a strong basal cingulum on 
the inner side, but none on the outer side. 
All of the teeth, and especially the canines, show by their attrition 
that the animal described is adult. 
Measurements. 
Length of the crown of the posterior superior molar.. 
Width of the posterior crescent of the penultimate superior molar. 
Elevation of the anterior cone of the penultimate superior molar from the 
base of the crown .. .... ..... 
Length of the fourth superior premolar...... 
Width of the same... 
Width of the second superior premolar. 
Diameter of the root of the superior canine.. 
Diameter of the base of the crown of the superior canine. 
Diameter of the crown of the incisor | |^®*^Situdinal. 
Length of the crown of the last inferior molar. 
Width of the crown of the last inferior molar. 
Elevation of the iTiner posterior cusp. . . 
Elevation of the inner anterior cusp.. 
Width of the heel behind the posterior crest... 
Length of an inferior premolar. . ... 
Width of the same. 
Diameter of the base of the crown of the inferior canine 
Length of the crown of the same. . 
I transverse. 
$ an tero-posterior .. 
M. 
,0. 038 
0. 014 
0. 018 
0. 022 
0. 035 
0. 029 
0.034 
0. 030 
0.016 
0. 027 
0. 046 
0.030 
0.016 
0. 025 
0. 0065 
0. 022 
0. 022 
0. 026 
0. 035 
0. 053 
But one specimen of this species was found. The corresponding teeth 
of the six specimens of the C. radians from New Mexico and Wyoming 
which I have seen, differ uniformly from those of the C. lohatus in the very 
small heel of the inferior molars, the elevated cusps, absence of internal 
median tubercle, etc. 
