THE OSTEOLOGY OF HYiENODON. 519 
in none of tl.e a-cent fo,.,,., it so extensive as in //jWo,, just as in this venus 
the faiKsatn,.. „ of very except, onall, Urge site. There is 1 long and promt” 
nmgiiu,,, prcicesson me. II, which bears a Urge facet for that carpal. The contact 
of ,.,c. II with the niagnum is more extensive than that of me. Ill with the iinci- 
lor,,., and „ rclati.m ly larger than is to be found in any of the recent earnivoms, 
except the cats. Below the magnum projection is a concavity, into which tits the 
head of me. III. The shaft is stout, particularly its distal portion, and in the proxi- 
mal part 18 of subqnadrate section. The trochlea is low, but wider, more symme- 
trical and with a heavier and more prominent carina than that of me. 1 . 
The third metacarpal considerably exceeds all the others in length. The 
proximal end is rather narrow but much extended in the dorso-palmar direction 
and carries a facet for the magnum, which is extended and convex in the same 
direction, narrow and slightly concave transversely. On the radial side of the head 
is a convex facet for me. II, which is confined to the dorsal border, while the articu- 
lation with me. 1\' is by means of two facets which occupy the whole dorso- 
palmar thickness of the head. Of these facets the dorsal one is large and concave, 
the palmar smaller, plane and situated at a higher level, becoming confluent with 
the magnum surface, from which the dorsal facet is divided by the unciform process. 
The latter process is .small, not at all comparable to the size which it attains in the 
cat.s ; it e.xtends but little over the proximal end of me. IV, and is confined to the 
dor.sal half of the head. In the figure of the manus of H. horridus given in my 
former pajier (Xo. 0 , IM. VII, fig. 5 ) this process is restored as much too large, for 
1 was misled by the damaged condition of the head of me. Ill in the Cambridge 
specimen. The better preserved individuals now at hand show that tbe unciform 
process of me. HI is much smaller than in Mesonyx, or even than in Oxyxna, and 
smaller than the magnum process of me. II, which is not only more prominent, but 
extends across the entire thickness of the head. The shaft of me. Ill is long and 
rather slender; its proximal half has the angular, subquadrate form seen in the 
dogs, while tbe distal is more oval in section and considerably broadened at the end, 
though the lateral ligamentous processes are much less prominent than m the cats 
The tloclllva in iMwiid „„d ayniNielricil, the oariiia being in the media., line and 
better deveUiped than on ,„c. I and II, The trochlea is but moderately convex, 
„ .|„. ouicm. The Lad 
i;::.:r:,eL:i:t-rh;::tndg^^ 
a lower level, allowing t ;:S.ai 
While the palmar lacet ^ V ^ tbe same plane. On the ulnar 
articular surfaces ol me. Ill and 1 facet for me. V, which extends 
side of me. IV is a .single low an 
iu-ross the full thickness of the hem . heavier and of less 
but curved, with the do not form asymmetrical pair, as they 
distinctly quadrate section. Me. 1 
