PETERSON : NEW CARNIVORES FROM MIOCENE OF WESTERN NEBRASKA 265 
facet for the scapho-lunar is slightly convex from before backward near the dorso- 
radial angle, while further back and along the ulnar portion it is concave in the 
same direction. Radially there is a large facet for the trapezium, which takes up 
nearly the entire face. On the ulnar side the facet, for the lunar, meets that for the 
magnum at an acute angle soas to form a prominent ridge, which extends a short 
distance back from the dorsal border. Back of the ridge 
the ulnar face is taken up by a large rugose area for the at- 
tachment of muscles and ligaments. On the distal face 
there is a large subtriangular articulation for the second 
metacarpal. 
The free end of the pisiform indicates this bone to be 
quite like that in Daphanodon. 
Fie. 60. Foot Bones of 
i x 1 bil ‘ Borocyon robustum. 4 nat. size. 
ess arched forward, and less curved outward at the distal yy, 4915, i cleat bgp ae 
Me. [has the head less expanded transversely, the shaft 
end than that of Daphenodon superbus; there is. otherwise metacarpal I; 2, dorsal view 
little or no difference between this bone in the two forms. 2% 80nd Phalanx ; 3, dorsal 
view of a first phalanx; 4, 
Other fragments of the metacarpals suggest heavy bones in jyoximal view of trapezoid ; 
this region. 5, dorsal view of trapezoid ; 
6, radial view of trapezoid ; 
The phalanges are proportionally short when compared 3 : 
: 5 7, ulnar view of trapezoid. 
with Daphenodon. Those of the proximal row are other- 
wise arched in the dorsal direction similar to the conditions found in-the latter 
genus, while the median phalanx is depressed and broad. There is no ungual pha- 
lanx present with the type. 
The hind limb is represented by the lower half of the tibia and fibula, the 
astragalus, navicular, ento-, meso-, and ectocuneiforms, and other fragments. 
With the exception of the proportionately somewhat greater antero-posterior 
diameter of the distal end, the tibia offers little or no characteristic differences by 
which it may be distinguished from that of the smaller genus. The distal end of 
the fibula is more compressed laterally than in Daphewnodon ; otherwise there is also 
little difference in this bone in the two forms. 
The astragalus has a slightly longer neck and the articular surface of the 
trochlea descends lower than in Daphenodon, otherwise this bone does not differ 
in the two genera. The principal difference of the navicular from that of Dapheno- 
don is seen in the smaller development of the plantar tuberosity ; the rugose area for 
muscular attachment slanting more upward and backward, resulting in the com- 
paratively small vertical diameter of the tuberosity. ‘The entocuneiform is quite 
large, and of good proportionate vertical diameter. The tibial plantar angleis more 
