CORYPHODOK 
249 
The anterior zygapophysis does not project much beyond the centrum, and 
is concave on its inner face, so that its superior portion looks inward, and 
its inferior portion upward. The inferior surface of the centrum is pene- • 
trated by foramina, of which one on each side is conspicuous for its large size. 
The right humerus exhibits a prominent twisted crest, which ceases 
opposite to the point of origin of the external marginal ala. The latter is 
also twisted forward to the external epicondyle, which is as prominent as the 
inner epicondyle, but less abruptly defined above and below. The latter is 
not so prominent as in most of the Creodonta, but both tuberosities are large. 
There is no arterial foraifien. The olecranar fossa is wide and deep, but 
not perforate; the radial fossa is shallow. The condyles are hourglass¬ 
shaped and without ridges; the inner extremity is bounded by a prominent 
acute border; the external is obtusely rounded. 
The left ilium has its thin borders broken away. It is characterized 
by the width of the peduncle and expanse of the crest. The anterior 
inferior spine is an acute crest, as in many existing Ungulates; and there is 
a low tuberosity on the inner side at the superior portion of the pectineal 
line. The groove for the attachment of the sacrum is elongate, and bounded 
by prominent ridges; its plane is not in that of the expansion of the ilium, 
as in many Ungulates, but is oblique to it, so that a section of the ilium 
through its middle is triangular, the line bounding the internal side being 
about six-tenths the length of that bounding the inner side. The leather 
slender pubis has an oval section. 
The distal ends of the femora are undistorted. They show the usual 
smaller size of the outer condyle, and the equal width of the intercondylar 
fossa. The fibula, while of the same diameter as those already described, is 
shorter. The inner face of the shaft is flattened in the inferior two-thirds; 
the external margin is acute. The inferior extremity has the usual expan¬ 
sion, and is divided into two subequal faces externally by a longitudinal 
angle. The inner face is gently concave, and readily admits of a gliding 
movement on the external convex border of the astragalus, which fits it. 
The superior extremity of the fibula is less expanded. The astragalus 
presents no peculiarities not seen in the other species. Its superior surface 
is a little wider than long, and is very slightly concave. 
