CliEODONTA. 
101 
A fourth specimen includes portions of almost all parts of the skeleton, 
including' a few teeth, whose proportions refer them to this species. The 
crown of the canine is long and acute, and the enamel is rugose, with deli¬ 
cate reticulations and longitudinal grooves. The ziygomas are strongly 
convex, and the prominent borders of the glenoid cavities are of equal 
development. The caudal vertebrm are large and elongate. The inferior 
extremity of the tibia has been already described in its more important 
features. The shaft is subround in section, the outer margin produced by 
the presence of two longitudinal ridges of the outer side, one of which 
..extends to the lower extremity ; the other lying close to it disappears above 
that point. 
Measurements. 
M. 
Length (transverse) of the glenoid cavity. 0. 031 
Length of the caudal vertebra. 0. 0285 
Diameter of the end of the centrum of the caudal vertebra. 0. 012 
Diameter of the shaft of the tibia. 0. 014 
Diameter of the astragalar face (transverse). 0. 022 
Diameter of the astragalar face (antero posterior). 0. 015 
This Carnivore was about the size of the Coyote {Cams latrans). 
Oxysena lupina, Cope. 
Plates xxxiv, figs. 14-37, and xxxv, figs. 1-4. 
Report Vert. Foss. New Me.xico, U. S. Geog. Survs. W. of 100th M., 1874, p. 11; Id. 
Ann. Report CT. S. Geog. Survs. W. of 100th M., 1874, p. 123. 
I refer to this species five individuals, all including more or less com¬ 
pletely preserved dentition, and some of them embracing portions of the 
limbs and vertebrm. 
These specimens are all intermediate in size between those referred 
to the 0. morsitans and the 0. forcipata, and are readily distinguished by that 
test from those species. They differ among themselves in the relative 
development of the internal heel of the third superior premolar; in some, this 
heel is well marked; in others, quite rudimental. The inferior sectorials of 
the individual regarded as typical of the species differ from the correspond¬ 
ing ones of the 0. forcipata in the relatively smaller size of the interior 
tubercle; it is very insignificant in the 0. lupina^ and does not reach the 
elevation of the line of the anterior cusp, while in the larger species the 
