the osteology OF HY^NODON. 
narrower, less depressed and has no such extensive articulation with the cuboid, if, 
indeed, it has any at all. , . . . , i j 
The calcancum has a r.ather long tuber, which is deep and compressed, some- 
what thickened and rugose at the free end, which is without any distinctly marked 
ten.linal sulcus. The donsal margin of the tuber is slightly convex and the plantar 
concave, arching downward to a rougliened surface vertically below the fibular facet, 
whence the border rises to the distal end. The greatest dorso-plantar diameter is 
thus at the lihular iacet; it is a little more distal in H. cmenhis than in H. ho7'- 
ridiis. In //, mustelimis the tuber is relatively shorter than in the large species, 
'fhe process for ligamentous attachment which arises from the external side near 
the distill end is quite prominent, especially in H. Iwrridus and H. mustelinus, 
though not so nnich .so as in some of the European species (e. g. H. bj'achyrhynchus) . 
The sustentacnlimi is not very strongly developed and carries a concave, nearly 
circular astragalar facet. The outer astragalar facet is large and convex and pre- 
sents more toward the internal than toward the dorsal side; its junction with the 
(ilmliir facet, which lies in a somewhat different plane and presents distallj’ and 
dorsally, forms an inconspicuous ridge. The fibular surface is very" large and promi- 
ueiit, most exceptionally .so for a flesh-eater, and gives to this region of the calca- 
neuiii quite an artiodactyl aiipearance; this facet is elongate and convex and rises 
very" steeply from the body of the calcaneum. So far as can be judged from the 
pulilished (ignres, the fibular facet is not so extensively developed in the European 
species as in the American and the sulcus between the external astragalar facet 
and the sustentacnhim is more deeply incised. The cuboidal facet is quite oblique 
to the long axis of the calcaneum, inclining distally and to the external side; it is 
slightly concave in both directions and more or less warped and saddle-shaped. 
1 he calcaneum of Oxycejta has a relatively shorter and heavier tuber than that 
of Hycetiodon, a much larger and more prominent sustentaculum and a more ob- 
h.piely-placed cuboidal facet. The most important difference between the two 
genera, however, consists in the fact that in there is no distinct surface for 
he fibula, the a.stragalus extending so far over the dorsal face of the calcaneum as 
to exclu.le the latter from any contact with the fibula. In the whole creodont- 
large ,,„„e . its greatest diameter is the vertical or 
the hreadtl, and thiekness are ne.rl, equal to Zl other 
obiiq„ei„p»itio„. beh,g highe; at 
both the dorsal and external sidL If 
lus, whicli seems unlikely, it is not sufficient to astraga- 
ntal end ot the „„b„id L thus el« dlrlT" l’™"' 
Palrio/el,!, where the cuboid posse^es^facets for tlir f”* 
^eari, equal site. These two U meetr": rl^ ^d C tt 
