O. C. Marsh—New Vertebrate Fossils. 251 
420m, The least vertical diameter of the phalanx is 28™™; 
The shaft of the bone is rounded throughout. The distal 
articulation is hemispherical above, but presents two shallow 
grooves below, which are carried around so far as to become 
nearly horizontal. The greatest proximal diameter is 50™™, 
and the greatest distal diameter 44™™. : 
The proximal face of the fifth metatarsal is oblique, trian- 
gular in outline, convex vertically, and through the greater 
part of its tranverse extent. Its greatest vertical extent is 
mm, and greatest horizontal diameter the same. The vertical 
diameter of the shaft of this bone is 40™™, and its transverse 
diameter 38™™, caneum measures 108™™ from its pos- 
terior end to the vertical face for articulation with the astraga- 
lus. The vertical diameter of the shaft is 53"™, and the trans- 
verse diameter 41™™. 
: ese remains are from the Lower Pliocene of Nebraska, and 
Indicate an animal about as large as a Rhinoceros. 
Amynodon, gen. nov. 
The present genus is based upon a nearly perfect skull, and 
various other remains which belonged to the oldest representa- 
tive of the Rhinoceros family yet discovered. These speci- 
nection with the rest of the anterior dentition, they prove con- 
clusively that the large lower teeth, usually regarded as incisors 
