CREODONTA. 
Ill 
A fragment of the femur shows that both the great and little trochanters 
are well developed, the former inclosing the usual fossa. The distal halves 
of both tibise are preserved, one of them adhering to a mass of the vertebrm. 
The shaft below the middle is subcyliridric, while the distal end presents 
the peculiarity common to all the flesh-eaters of the Eocene of New Mexico. 
The astragalar surface is without groove, and is oblique both transversely 
and longitudinally. The inner extremity of the bone is produced down¬ 
ward, fitting the inner oblique face of the astragalus, as well as the con¬ 
cavity of the side of the neck by its end. There are no strong ligamentous 
grooves. The bones of the feet are unknown. 
A comparison of such portions of the limb-bones as I have observed 
(those of S. viverrinus) with those of Felis catus (domesticus), Ganis fami¬ 
liarise and Ursus arctos, has the following result: In the humerus, the 
tuberosities are not so pronounced; especially is the great tuberosity more 
produced upward and outward in the recent genera, whence the bicipital 
groove is deeper. In Ursus arctos, the greater tuberosity is also produced 
more posteriorly, and in all of the species named its posterior bounding 
ridge is more pronounced on the shaft than in P. viverrinus. The great 
trochanter of the femur has the elevated position of that of Felis and Ganis 
rather than the depressed form of that of Ursus, and the compressed and 
moderately elevated distal end is that of the former two rather than like 
the same region in the latter genus. The distal end of the tibia is unlike 
that of either of the three genera named, but resembles most that of Ursus. 
The entirely distinct character of the astragalar articular extremity has 
been already described. The anterior end of the shaft is convex in 
8. viverrinus, flat in Felis and Ganis; flat behind in the former, convex in 
the latter. The external end of the shaft is transverse in 8. viverrinus, 
oblique in Ganis and Felis, especially so in the former, being more or less 
parallel with the inner astragalar groove, while in 8. viverrinus it diverges 
from the angle which represents the groove. The tendinous groove is 
wider and better defined than in G. familiaris, more resembling that in Felis. 
The inner malleolus is more anterior in position than in the two genera 
named, and bears a distal articular facet, which is wanting in Felis and 
Ganis. As compared with Ursus arctos, the inner malleolus is more pro- 
