132 
CREODONTA. 
Depth of the same. 0.0005 
Length of the same (posterior). .. 0. 0116 
Width of the same (posterior)... 0. 0110 
Depth of the same (posterior). ./. 0. 0070 
The size of this species is about that of a domestic Cat. It is more 
robust than the species last described, and appears to have nearly the pro¬ 
portions of the Bidymictis protenus. From this species it differs strongly in 
tlie form of the distal end of the radius. The remains described were all 
found together by myself. 
DIACODDN, Cope. 
System. Cat. Vert. Eocene New Mexico, U. S. Geog. Survs. W. of 100th M., 1875, p. 12. 
Four inferior molars, which are composed of two portions; the anterior 
much elevated, and supporting two opposite acute cusps; and a posterior, 
much depressed, bounded by some low tubercles posteriorly. Number 
of premolars unknown. Superior premolar compressed, without basal 
tubercles. 
This form is probably, but not certainly, a true Creodont. It differs 
from many genera of Insectivora in the number of complex molars, adding 
one to the usual number. It differs from most of them, also, in the absence 
of the anterior cusp of the molars, among others from HerpetotJierium, Cope, 
of the Miocene, where the number of molars is the same. Of the numerous 
genera of Insectivora reported from the Eocene of Wyoming, but few have 
been described, and among the latter I find none without the anterior cusp. 
Diacodon alticuspis, Cope. 
Plate xlv, fig. 19. 
System. Cat. Vert. Eocene New Mexico, U. S. Geog. Survs. W. of 100th M., 1875, p. 12. 
Represented by a right mandibular ramus, which supports the last 
premolar and four ? true molars, with a superior premolar included in an 
attached portion of matrix. The hardness of the rock, with the softness of 
the osseous tissue, has determined me not to attempt to clean the specimen 
entirely. 
The two elevated cusps of the anterior part of tlie crown are of equal 
