250 O. C. Marsh—New Vertebrate Fossils. 
bone is rather smooth. The under surface, below the articula- 
tion, is flattened. The second phalanx is less than half the 
length of the first, and its surface is roughened, as if by abnor- 
mal growth of bone over the surface. The length of the first 
phalanx is 43"; the longitudinal diameter of the metacar- 
pal articulation 18"; its transverse diameter 23™”. e 
least transverse diameter of the bone is 21™™: its vertical 
20 
The greatest vertical diameter of the bone is 32 This 
bone resembles the penultimate phalanx of the middle finger of 
Priodontes, but is somewhat shorter and thinner. : 
These and other less characteristic remains indicate an anl- 
mal somewhat larger than a tapir. They were found in the 
Miocene of Oregon by the Yale Expedition of 1873. 
Moropus senex, sp. nov. 
A second larger species of the same genus is indicated by @ 
few remains, among which is the characteristic bone formed of 
the united phalanges. The proximal phalanx is considerably 
larger than the one above described. Its length is 52%. 
The proximal articulation is oblique, and does not occupy 
more than one-third the upper surface of the bone. The me- 
dian phalanx is well preserved, and measures 25™™ in length. 
It is not united with the first phalanx in a line with the axis 
of that bone, but is inclined about 15° toward the sole of the 
foot. Its distal articulation is composed of two not very prom- 
inent pulley-shaped surfaces with a groove between. 
Moropus elatus, sp. nov. 
is more nearly vertical than in either of the Miocene species. 
ts median vertical diameter is 30™™:; and transverse diameter 
