194 
PANTODONTA. 
under the head of Corypliodon^ of uncertain species No. III. They have 
slender, slightly curved, and compressed shafts, with clavate extremities, 
which are truncate at the ^ds. 
The humerus is a stouter bone than the femur. The head is particu¬ 
larly large, and the greater tuberosity is large and hook-like, bounding a 
deep groove with the lesser tuberosity. The deltoid crest is prominent, and 
extends beyond the middle of the shaft, and terminates in a twist forward. 
The condyles have the usual anterior direction, and their surface is simply 
hourglass-shaped, without the carina or rib seen in Tapirus, Hyracodon, 
Hyracliyus, etc., showing its affinity to Loxolopliodon. It resembles the latter, 
and differs from the former in the large siz(3 of its lateral tuberosities, which 
give the humerus a great distal width, approaching the corresponding bone 
in the Creodonta in this respect. The ulna and radius are entirely distinct, 
including their distal extremities. The ulna has a much larger share in the 
carpal articulation than in the Perissodactyla, and is in the same transverse 
plane as the radius at that point. As compared with the diameter of its 
shaft, the carpal extremity of the radius is narrowed. This relation is 
appropriate to the small size of the scaphoid and large size, especially the 
width, of the cuneiform, in the carpus. The proximal part of the ulna is 
compressed below, and the distal end depressed so as to be transverse, but 
it is not so expanded as in Uintatlierium. The head of the radius is a trans¬ 
verse oval, with the articular face a gentle sigmoid in horizontal section. 
The articulation with the ulna is not interlocking, but nearly level. 
Anterior foot —Several anterior feet of Coryphodonts were procured, 
three of them nearly entire. These display well their extraordinary form 
in the shortness as compared with the width, in which they resemble those 
of the Elephants more than any other animals. There are five digits,* as I 
first pointed out, of which the second, third-, and .fourth do not differ much 
in length; the length of the third, with the carpus, being in one specimen 
equal to the width of the palm. The fifth digit is a little shorter than the 
fourth, while the first is the shortest. 
The scaphoides is the most irregularly shaped of tlie carpals. It con ¬ 
sists of an anterior intercalated portion and a posterior tuberosity, which is 
* See System. Cat. Vert. Eocene N. Mex., U. S. Snrvs. W. of lOOtli M., 1875, i). 24. 
