102 
CKEODONTA. 
two cusps have the same elevation, and the interior is separated from the 
external by a fissure. How far this character will define large series of 
specimens, I have no means of knowing; but it is constant in four of the 0. 
forcipata. 
The typical specimen of the 0. lupina includes part of the dentition of 
both jaws, with bones of the cranium, limbs, and vertebrae in a fragmentary 
condition. The fourth and fifth superior molars have well-developed anterior 
tubercles and elongate posterior blades; the internal heel of the fourth is 
large, much exceeding that of the fifth, and there are no intermediate tuber¬ 
cles : both have a weak internal basal cingulum. There is a weak external 
basal cingulum on botli. The third premolar has no anterior basal tubercle 
in this or any of the other specimens, but the heel has a median cutting- 
edge nearly as long as the long diameter of the large compressed median 
cusp. There are faint cingula on both bases of the crown. In a more 
anterior j)remolar, the posterior blade is reduced to a trenchant cusp, and 
the principal cusp has low cutting-edges. Its external face is. convex; the 
internal, concave in the longitudinal direction. The crown of one of the 
small median incisors is larger in antero-posterior than transverse diameter, 
and contracts to a short subconic apex. 
The posterior lower molars have a small heel, one border of which 
forms a cutting-edge higher than the other; the anterior cusp is much less 
elevated than the external median, and is obtuse and without basal tubercle 
in front. It differs in this respect from the three specimens of 0. forcipata, 
where the corresponding part of the tooth is preserved. In these, the anterior 
margin of the anterior cusp is an acute edge, with a subacute lobe at the 
l)ase. The canine is a vertical oval in section at the base of the crown, 
and the enamel extends much farther downward on the external than the 
internal face, as in other species of the genus. The enamel of the teeth is 
rugose with impressed punctm, which are least marked on the penultimate 
superior molar. 
A caudal vertebra of the same animal, without neural arch, is of full 
relative size, and quite slender in form, indicating a long tail for the species. 
A wide saucer-shaped bone, resembling the navicular of a Bear in form, is 
wider than that of Canis and Fclis: it is thin and concavo-convex. One 
