108 
CliEODONTA. 
representing tlie superior longitudinal sinus, is distinct, and of equal widtli; 
there are no grooves distinguishing convolutions on that part of the surface 
of the hemispheres which can be obtained by moulding. The posterior 
part of the hemispheres does not appear to have been expanded, judging 
from the form of the j)arietal bones. 
The sixth specimen is referred to this species with question, as the 
penultimate inferior molar (the only tooth preserved) is larger than the 
corresponding one in those above mentioned; the length of its base is 0™.018, 
and the width 0"\009. It is accompanied by various fragments, among 
which is the distal extremity of the tibia. This resembles that ascribed to 
the 0. morsitans^ and differs from that of Ambloctonus and Stypoloplms in the 
presence of a subacute longitudinal angle of the extero-posterior margin of 
the shaft, giving the section an acuminate outline at that point. The 
internal malleolus is greatly produced and thickened, and the posterior 
astragalar border is even more oblique than in the other cases described; a 
portion of the anterior border is subhorizontal. The posterior face of the 
shaft is longitudinally concave. Long diameter of shaft, 0™.01(j; short 
diameter of the same, (,/“.012; diameters of astragalar face, 0"'.018 and 0“'.015. 
This animal differs in specific characters from the Wyoming Carnivores, 
already referred to, in the greater robustness of all its parts. From Syno- 
plotherium lanius, it also differs in the regular increase backward in the size 
of the molars. In the Wyoming species, the penultimate is largest in the 
lower jaw. 
The fragments of the Oxytsna forcipata are as large as corresponding 
parts of the Jaguar. 
A comparison of the cranium of this species with that of the Jaguar 
reveals the following differences: The tooth-line of the lower jaw is of the 
same length, but includes six teeth instead of three. The ramus is deeper, 
especially posteriorly, but it gradually narrows to the canine tooth instead 
of continuing nearly horizontal to the beginning of the symphysis, and then 
abruptly rising. The latter arrangement in the Jaguar is related to the more 
vertical direction of the canine teeth. The Bear is a little nearer the Oxyana 
in this respect, but not much. The produced inferior border of the masse¬ 
teric fossa of the Cats is wanting in the Oxycena^ as it is in the Dogs and 
