214 
COKYPHODON. 
typo, of uncertain reference. It differs in the absence of cingulum from 
the inner side of the base of the crown, which is strongly developed in the 
Wyoming specimen. The posterior V is narrow, and produced well inward, 
and a strong ridge passes within its inner base from the posterior cingulum 
to the anterior transverse crest. The anterior external crest is a small 
flattened cone, whose external face is half as wide as that of the posterior. 
Anterior cingulum strong. An incisor is large, and has the form of those 
of the type. Its crown is higher than wide and without basal cingula. 
Measurements. 
Width of the posterior molar (inferior) .. 
Length of the penultimate molar. 
Width Of the same.... 
Diameter of the inferior canine j ^ransv^se. 
Diameter of the first upper true molar | 
Transverse extent of its posterior external crest. 
Antero-posterior extent of its posterior external crest... 
Height of the crown of the incisor. 
Width of the crown of the incisor. 
This animal I suppose to be a male. 
The other individuals of Coryphodon radians do not exhibit any charac¬ 
ters not already mentioned in preceding descriptions. 
Coryphodon latidens, Cope. 
Bathmodon latidens, Cope, System. Cat. Vert. Eocene New Mexico, U. S. Geog. Siirvs. 
W. of 100th M., 1875, p. 29. 
Represented by both mandibular rami with dentition nearly complete, 
by the left premaxillary bone with its teeth, and by a right superior canine. 
These portions belong to a species of about the size of the B. elephantopus, 
but one of a shorter and more robust form of skull. It differs in the same 
way from B. radians, besides being of distinctly smaller size. 
The rami are stout, especially below the last molars, and not shallow 
anteriorly. Posteriorly, below the last molar, the inferior border retreats 
upward, so that the angle of the jaw is opposite to the superior fourth 
of the vertical diameter of the ramus at the middle. The inferior border 
M. 
0.028 
0.037 
0.026 
0.030 
0. 028 
0.032 
0.082 
0. 020 
0. on 
0. 026 
0.022 
