208 
COEYPHODON. 
not so incurved posteriorly. The external face of the ramus is convex, and . 
the masseteric crest well developed; the inner face of the ramus is flat. 
The inferior molars are relatively wider than in any other species excepting 
the C. latidens, but the cusps, especially the anterior ones, are not so elevated 
as in that species. Both the crests are more oblique than in that species, 
and, indeed, more so than in any other of the genus. The posterior crest 
extends diagonally, so that the internal cusp overhangs the base of the 
crown, while the external extremity marks by its anterior border the middle 
of the length of the crown. A low cingulum or heel behind the latter gives 
the crown its oval outline, but the cingulum rises to the outer side of the 
inner cusp and disappears. As though in continuation of this ledge, a 
similar crest descends from the opposite or antero-internal side of the cusp, 
and disappears near the base of the anterior crest. From the width of the 
eroded surface of the anterior part of the tooth, the descending anterior 
cingulm is probably well developed. 
The penultimate molar has a very narrow cingulum, and the internal 
lateral crest is not visible in the section produced by mastication. The 
unworn enamel surfaces are plicate-rugose. The inferior molar, like that 
of the type-specimen of the C. radians, is relatively rather small, on which 
account I have supposed the individuals to be females. The inner side is 
flat, and the section of the remaining portion of the crown forms a segment 
of a circle. Where it joins the inner face anteriorly, there is an obtuse 
ala, as in B. radians; at the corresponding position posteriorly, it exhibits 
the transverse concavity due to the attrition of the superior canine. 
Measurements. M. 
Length of the bases of the true molars. 0. 080 
Length of the base of the last true molar. ... . 0. 032 
Width of the base of the last true molar.... .. 0. 023 
Depth of the ramus at the last premolar. 0. 049 
Width of the ramus at the last premolar..... 0.028 
Depth of the ramus at the last true molar. 0. 058 
Width of the ramus at the last true molar. 0. 031 
Width of the base of the coronoid process. 0. 031 
„ , , „ , ^ . (antero posteriorly. 0.020 
Diameter of the base of the crown of the canine ^ transversely. 0.021 
The specimen described is the only one which I can refer to the 
species. 
