402 
MEMOIRS OF THE CARNEGIE MUSEUM. 
and possessed of three digits. The humerus is robust, with a comparatively weakly 
developed deltoid crest, at the distal end somewhat broadened transversely, with a deep 
olecranal fossa and a well developed epicondyle. The radius and ulna are scarcely longer 
than the fore arm, of nearly equal size, like Tapirus, Diplacodon, and Brontotherium, 
closely appressed and at the distal end coéssified. The carpus has four bones in the 
proximal series, three in the distal series which are short. The os magnum in front 
is unusually small, nevertheless behind it increases in size, articulating above with 
the scaphoid and the lunar. The unciform is very large, articulating to nearly an 
equal extent with the cuneiform and the lunar. The trapezoid lies under the 
scaphoid; its upper articulating surface is hemispherical and unites behind with 
the lower facet, so that the scaphoid is able to glide upon the upper articular 
surface of the second metacarpal which is produced behind. The three meta- 
carpals have almost an equal development, their distal articulating extremities 
being without a median keel. On the second phalanges the distal articulating surface 
is almost wholly confined to the upper surface of the bone, and thereby reveals the 
fact that the strong, claw-shaped, crooked, and deeply divided terminal phalanges 
were capable of being strongly bent upward. The excavated proximal articulating 
surfaces of the terminal phalanges are strongly keeled in the middle. A complete 
coalescence of the first two phalanges (probably of the outer finger) has been observed 
by Gaudry. The femur is like the humerus in length, without a third trochanter. 
The tibia is very strong, scarcely shorter than the radius. The fibula is probably 
wholly separate. The tarsus is low and broad. The caleaneum possesses a moder- 
ately elongated tuberosity, distally truncate, the two facets for the astragalus being 
large. The cuboid is low. The navicular is truncate above, plane. The ectocunei- 
form is very broad, the mesocuneiform small. The three metatarsals are shorter 
than the metacarpals, the one in the middle being the longest. The phalanges are 
formed as in the fore foot, with the exception that the terminal phalanges are somewhat 
more massive and less deeply divided. 
Moropus Marsh. (American Journal Science, Third Series, Vol. XIV, pp. 249, 362.) 
Fig. 255. This genus was originally erected by Marsh upon foot bones derived from 
the upper Miocene of the John Day in Oregon (M. distans and senex Marsh), and was 
referred to the Edentata. A third species occurs in the lower Pliocene (Loup Fork of 
Nebraska) (M. elatus Marsh). In the John Day deposits as well as in Nebraska 
there occurred together with the bones of the extremities of Chalicotherium teeth 
referable to the species, which in their size correspond to those of Schizotherium 
modicum Gaudry, and are characterized by the fact that the inner cusp of the upper 
premolar is connected with the outer wall of the tooth by two cross-crests. 
