244 
CORYPHODON. 
phalanges of the third and fifth digits are present, and some of those of the 
second and fourth. 
The calcaneum is somewhat flattened by pressure. It is as broad 
anteriorly as long, and the free portion is turned inward, with a concavity 
on the inner side. It is flat, and the inferior surface is roughened for 
ligamentous insertions. The inner anterior expansion has its astragalar 
facets in two (an anterior and a posterior) transverse planes, while the astrag¬ 
alar plane of the exterior. part of the calcaneum is the anterior, though 
posterior in position. The astragalus is broader than long, presenting an 
anterior acumination inward. The tibial face is continuous and slightly 
concave in both directions. Of the two distal faces the navicular is the 
larger, extending to the internal apex, while the cunei-cuboid face does not 
extend to the external margin of the astragalus. While the astragalus is 
unaltered, the cuboid has been somewhat depressed, like the calcaneum. 
It does not, however, thin out to an acute border, as in the skeleton described 
just preceding the present one as No. I. It has a short, rounded, straight, 
external border, shorter than the internal. The calcaneal and astragalar 
facets make a strong angle with each other, while the two distal metacarpal 
facets are nearly continuous. The remaining bones of the foot have not 
been modified by pressure. 
The ectocuneiform is the largest of the cuneiforms, and is chiefly in 
proximal contact with the astragalus. Its navicular and cuboid facets are 
subequal. Its anterior face is quinquelateral, and a little broader than long. 
The navicular is a flat thin bone of an L-shape, the antero-posterior limb 
being next to the ectopterygoid. The cuneiform faces are distinct, and the 
internal is large. The mesocuneiform is larger than the entocuneiform, and 
its anterior face is a little wider than long. The corresponding face of the 
entocuneiform is longer than wide. The last is a wedge-shaped bone with 
triangular horizontal section. 
The proximal ends of the metatarsals are subtriangular in form except¬ 
ing those of the first and fifth. That of the fifth is bilobate posteriorly; 
all are nearly truncate, the third only presenting some convexity to the 
ectocuneiform. The second and third are subequal, the third exceeding; 
the fourth is distinctly shorter; and the fifth is about half as long as the 
