CORYPHODON. 
237 
truded. The section of the superior canine tooth is precisely similar to that 
of the typical specimen, including the two ridges of the posterior cutting- 
edge. A penultimate superior molar displays a peculiarity in the distinct¬ 
ness of the cone which represents the anterior V, and is as well developed as 
the corresponding cusp in the first true molar in the specimen first described. 
The last inferior molar tooth which furnished the description of the 
Bathmodon lomas does not differ in any important respect from the correspond¬ 
ing tooth in the cranium of the sr)ecimen here first described. The latter 
enables me to determine the identity of the B. lomas with the C. molestiis. 
This tooth is characterized as follows: The anterior crest is much more 
elevated than the posterior, with its inner apex almost a cone, with 
anterior, thick, revolute border. The usual oblique cingulum descends 
from the outer apex forward. The longitudinal ridge connecting the crests 
is low but distinct, while the posterior ciugular ridge is remarkably large. 
This, which constitutes one of the specific marks, is extended horizontally 
so as to form a broad ledge, whose border is a segment of a circle. Enamel 
roughened with fine ridges on all the external surfaces. Tooth well worn 
by prolonged use. 
Measurements, 
M. 
Length of the crown .. 0. 041 
Width of the same anteriorly. 0.027 
Width of the posterior crest.. 0. 022 
Elevation of the same.. . ... 0. 011 
Elevation of the anterior crest.. 0. 024 
Coryphodontes of uncertain species. 
No. I. 
Plate Ivii, figs. 3-7; Plate Iviii. 
One of tlie most instructive series of specimens of this genus consists 
of the bones of one individual which were found by the writer lying exposed 
at the base of a low bad-land bluff, from which they had been weathered. 
They consist of limb- and foot-bones, and a few cervical vertebrte, and are 
in pretty good condition. They differ from most of the other specimens in 
their white color, a few only being stained. I do not describe all of these 
bones in detail, but figure a number of them, as I do not know whic h of 
the characters are specific in all of tliem. 
