the osteology of HYiENODON. 
1 ..nilv hrmfleniti<^ behind; the latter forms a high 
smaller and is very steeply toward the ulnar side, where 
convexity on the radia si e, u _ o reduced. 
Un tlie rauiai siinat fPi.kness of the unciform, the distal one very 
"vLLpelurllinod t„ the dors.l borfet. The fecet for the uttciform 
prlicoie of the thiril metacarpal h small. On the distal s.de are large facets for the 
fourth an.l liaii metacarpals, that for the latter being somewhat the smaller and 
more concave of the two. The palmar hook of the uneiform is reduced to a mere 
rongli tubercle. . , , o mci 
The carpus of Oxycena, which has been described by Osborn (iNo. d, p. iUb, 
fi-r. !)), presents niatiy decided differences from that ^iHymiodon. ^ The scaphoid is 
even lower and has a more evenly .curved distal border. The lunar is larger, and rests 
by facets of nearly equal size upon the central and unciform, while it appears to be 
altogether excluded from the magnum. The cuneiform is much smaller, and has 
not developed the strong, hook-shaped process from the ulnar border. The trape- 
zium is very much smaller and has a differently shaped facet for the first nieta- 
carjial. The central is not displaced toward the radial side and has facets of nearly 
equal extent (at least on the dorsal side) for the scaphoid and lunar, trapezoid and 
magnuin, and thus its dorsal face is diamond-shaped. The unciform is much higher 
and narrower and the cuneiform facet is much more oblique ; the hone thus is de- 
cidedly more like that of the fissipede Carnivora. The peculiarities of the Hyanodoii 
carpus are, then, as follows : (1) Tlie large size, especially breadth, of the cmieiforni 
and its ulnar hook ; (2) the radial shifting of the central and the consefiuont 
articulation of the lunar with the magnuin ; (3) the great enlargement of the 
trafieziiim ; (4) the breadth and lowness of the unciform. 
The metacarpus consists of live members. The first metacarpal is the shortest 
ot the series, but is heavy and massive, particularly at the proximal end. The head 
hears a very large and strongly convex facet for the trapezium, the only carpal 
element with which it conies into contact. Below the facet the head is widened 
transversely and very thick antero-posteriorly, with a prominent rugosity on the 
ulnar side, which has no facet for me. 11. Distally to this the shaft contracts, ex- 
panding again slightly at the distal end. The trochlea is narrow, asymnietrical 
and oblique and has hut a low carina. The rugosities for ligameiitoiis attachment 
above the trochlea are low, but the lateral pits, especially the one on the ulnar 
SK e, arc large and deej). Tlie pollex appears to have diverged somewhat from the 
direction taken by the other metacarpals, and to have possessed some fiicility of 
adduction and abduction. . 
Tl,a «c,«,,l metacarpal ie the etouteet of the series .and much longer than the 
iZiie, ‘ Wt", file head carries a saddle- 
Doi^r L -C tl “ tl-msverscly and convex ai.tero- 
■irticulatioiiof ® >i'i“l » large facet for the trapcriani. This 
.irt.culat,o,i „i me. I[ with the trapezium is very general among the Oamivoiva, but 
