46 KANSAS UNIVERSITY QUARTERLY. 



determined by comparison. The great tuberosity is partly broken 

 away, but evidently projected somewhat beyond the head. The 

 bicipital groove is deep and narrow; the inner surface of the shaft 

 is concave as far as to the lower extremity of the deltoid ridge. 

 The lesser tuberosity is separated from the articulating surface by 

 a deep groove, continuous with the concavity on the posterior 

 surface of the shaft reaching almost to its middle. The anterior 

 surface of the shaft is laterally compressed with the roughened, 

 deltoid ridge unusually prominent. The supinator ridge rises 

 above the middle of the shaft, curves outward and forward, forming 

 a marked concavity on the antero-external surface of the shaft, and 

 giving an unusual breadth to the distal end of the bone. The 

 supracondyloid foramen is well rounded. The inner condyle 

 is prominent and roughened. Back of the inner condyle and near 

 the trochlear surface is a broad groove, a character which seems 

 to be common in the species of Hoplophoneus, but which is lacking 

 in Dinictis. There is only a trace of it in the species of Fclis 

 examined and in MacJmrodus crassidois Cragin (Williston).* The 

 olecranal fossa is broad transversely, but shallow. The coro- 

 noid fossa extends as far outward as the exterior border of the 

 capitellum, much as in M. crassidois. It is quite as deep as the 

 olecranal fossa. 



The ulna is a strong bone, rounded and convex on the posterior 

 surface, slightly concave anteriorly and grooved on the external 

 surface throughout the greater part of its length. The olecranon 

 is stout, bent inward, and expanded at its roughened extremity. 

 The great sigmoid cavity is narrowed antero-posteriorl}', but broad 

 from side to side; the beak is thin, but prominent on the outer 

 border. The exterior border of the lesser sigmoid cavity, is not so 

 prominent as in recent forms. On the interior border of the 

 anterior surface, just in front of the great sigmoid cavity, is a 

 roughened surface for muscular attachment, common to Dinictis 

 but not found in the recent cats. The styloid process is short and 

 stout, and separated from the round articulating facet for the radius 

 by a shallow notch. 



The radius, represented by the proximal half of one bone. The 

 head is quite concave, as in H. robustus, and bears on its anterior 

 margin a prominent protuberance exterior to which there is a 

 notch separating it from the anterior prominence of the articulating 

 surface for the ulna. 



♦Kansas University Quarterly, Vol. HI, No. :{. 



