PETERSON : NEW: CARNIVORES FROM MIOCENE OF WESTERN NEBRASKA 241 
MEASUREMENTS OF METACARPAL IV. 
Mm. 
Greatest length - 60 
Greatest antero-posterior diameter of head. 15 
Greatest transverse diameter of head sae A 
Metacarpal V.—The fifth metacarpal is as heavy as the fourth, but it is shorter, as 
has been stated before. The proximal end is much expanded, especially in the ulnar 
direction, which is due to the heavy and rough tuberosity for 
the attachment of ligaments and muscles. The articulation 
for the unciform is regularly convex from before backward, the 
transverse diameter of the palmar area being greater than that 
near the dorsal face. In Daphenus this articulation is pro- 
portionally broader, but the ulnar face of the head is not as 
prominently developed as in the genus under consideration 
(see Fig. 39). The dorsal face of the shaft faces to the ulnar 
side of the manus as well as forward, and the shaft is arched 
forward in approximately the same proportion as that of Mc. — Fre. 39. Dorsal and 
I. The distal end is expanded and points slightly in the ra- Radial Views of Left 
‘ . . oe, Pee é ne Metacarpal V of D. super- 
dial direction when the bone is in position in the manus. The : 
bus. Nat. size. 
articulation for the proximal phalanx is similar to those on 
the metacarpals described above, except that the facet on the ulnar side of the pal- 
mar carina is placed higher up and is of larger size than the one on the radial side. 
MEASUREMENTS OF METACARPAL VY. 
Greatestileng this corscvesosestesies eiesteea vata vesnbas, six tewntsivonds tat eeoadetaewodtugece ew WiC eiaaks Vereves Fe 47 
Greatest antero-posterior diameter of Oatley eee se ces cact titania eleva eae SE Ra aL 
Greatest transverseidiameter Of Head se: seiccrecs.rat evacceceess recused taunesi nave sie vadsvectacs ceo aces¥iuvaser cases 13 
Phalanges.—The proximal phalanges are proportionally somewhat shorter 
than in the Oligocene genus, otherwise they bear a close similarity in every respect. 
They are broad, depressed, strongly 
arched in the dorsal direction, com- 
paratively gently convex dorsally, and 
rather flat on the plantar faces. The 
proximal ends are deeply pitted for the 
distal ends of the metacarpals and the 
Fic. 40. Phalanges of Digit V (left forefoot) of p. tubercles for ligamentary attachments 
superbus. Nat. size. 1, dorsal and radial views of first are very prominent. The distal troch- 
phalanx ; 2, dorsal and radial views of second phalanx ; 3, lea is well formed, but is confined almost 
plantar and radial views of terminal phalanx. 
entirely to the plantar face. 
