162 
T^NIODONTA. 
Length of the enamel of the face externally...... 0, 013 
Length of the same posteriorly. 0.005 
Length of the cro\^'n of the posterior upper molar. 0. 016 
Width of the same...... . „ —.. 0. 012 
Length of the crown of the posterior lower molar . . 0. 012 
Width of the same.. 0. 009 
Size about that of a fully-grown Peccary. 
OALAMODON, Cope. 
Ecport Vert. Foss. New Mexico, U. S. Geog. Survs. W. of 100th M., 1874, p. 5; Id., Ann. 
Eeport U. S. Geog. Survs. W. of 100th M., 1874, p. 117; System, Cat. Vert. 
Eocene New Mexico, TJ. S. Geog. Survs. W. of 100th M., 1875, p. 24. 
This genus is characterized as follows, from the material which I have 
been able to procure: Lower jaw with one pair of large incisors growing 
from persistent pulps; each ramus with seven teeth following its incisor 
without interruption, -the last within the base of the coronoid process. 
These teeth with simple roots, but not growing from pulps having a con¬ 
tinued persistence. Crowns of the molars with a transverse depression, which 
separates some low tubercles. Superior molars not certainly known. The 
superior incisors of two kinds, both differing from the inferior in having a 
squarely truncate grinding-face, instead of an oblique one, in which they 
differ totally from those of Bodentia. The larger have two enamel bands, 
an anterior and a posterior, and one side is concave. The smaller incisors 
have the anterior enamel band only, in the specimens preserved. 
A characteristic feature of the dentition in this genus is the thick 
coating of cementum which invests those portions of the molars and supe¬ 
rior incisors which are not protected by enamel. In these teeth, it is thicker 
than the enamel, and forms thickened raised borders surrounding the latter, 
producing a characteristic appearance not known in the other genera. It 
is not observable in the large inferior incisors. 
A part of the skeleton of one of the species is preserved It shows 
that the humerus was robust, and was pierced distally by a large arterial 
foramen. The condyles are not very convex, nor the internal epicondyle 
so prominent as in some of the Creodo)tta. The head of the radius is flat 
and incapable of rotation, and is rather slender, wliile the ulna is deep and 
