CORYPnODON. 
211 
Coryphodon radians, Cope. 
Batlimodon radians, Cope, Proc. Amer. Philos. Society, 1872, p. 418 (Feb. 16); U. S. 
Geol. Surv. of Montana, 1871, p. 350; Ann. Eeport U. S. Geol. Surv. of 
Wyoming, etc., 1872, p. 587 (1873). 
Of this large species, the remains are rather abundant in the Eocene 
beds of New Mexico. The best-preserved skeleton is that from Bear 
Biver, Wyoming, which served as the type of the original description. 
This will be fully illustrated in the forthcoming volume III of the quarto 
reports of the United States Geological Survey of the Territories. Of the 
New Mexican specimens, the first includes fragments of the cranium, with 
teeth of all positions, in a separate condition. The second is similar in 
character, but lacks what the first includes—superior molars. The third 
includes a few of the teeth, superior and inferior molars, canine, and incis¬ 
ors, with many parts of the skeleton in a fragmentary condition. Two 
other specimens consist of a superior and inferior true molar and a superior 
true molar. 
The inferior molars present the common characters of very small 
posterior cingula and elevated cross-crests; the canines are not compressed, 
and the superior has a triangular section of the crown. The last superior 
molar has a narrower outline than that of C. elepliantopus and other sj^ecies; 
the length of the crown being less in proportion to the width. 
In the first specimen, it is to be observed that, in the last superior molar, 
the transverse crests are nearly parallel; the posterior divided as usual, the 
external portion of the crest being a flattened cone. A cingulum extends 
round the base of the crown, except externally; it is weak internally and 
posteriorly, and strong anteriorly. A ridge rises from the posterior base 
near the inner extremity, and passes obliquely upward to the interior 
extremity of the anterior crest. This ridge is wanting in the type-specimen 
of B. simus. The enamel is smooth. The crowns of the incisors are trans¬ 
versely expanded. The penultimate inferior molars of both sides and the 
anterior part of the last inferior molar of one side are preserved. Tlie 
former are distinguished by the presence of only a rudiment of a heel, 
which is smaller than in the type-specimen from Wyoming, The cusps are 
elevated; there are no lateral cingula, and the enamel is entirely smooth. 
