G. I. Adams — Extinct Felidce of North America. 423 



The pelvis. — I have only fragments of the pelvis, but they 

 give an idea of its relative size and strength. The acetabulum 

 is one-fifth greater in diameter than that of the lynx. As a 

 whole the pelvis is more massive and considerably longer. At 

 the sciatic notch, however, the ischium has about the same 

 diameter as that of the lynx. 



The scapula. — The distal portion of the scapula is con- 

 siderably larger than in the lynx, the glenoid cavity being 

 about one-fifth larger. There is a short stout coracoid much 

 the same as in the modern cats. No other features are pre- 

 served in the specimens which are at hand. 



The fore-limb. — The humerus of H. primazvus is the same 

 length as that of the lynx, but fully one-half more massive. 

 The head presents a large articular surface which is very sim- 

 ilar in shape to that of the cats. The great tuberosity is par- 

 ticularly prominent and rises considerably above the head and 

 is well set off from it. The smaller tuberosity is low but 

 rugose and the bicipital groove quite broad. The prominent 

 character of the bone is the bold deltoid ridge which has a 

 straight sharp border on the internal side extending to the 

 great tuberosity. 



On the outer side, the lower portion has a similar border 

 which runs slightly divergent from the inner border, but 

 farther up curves toward the smaller tuberosity and becomes a 

 mere line on the convex surface. The prominence of the del- 

 toid ridge makes the antero-posterior diameter of the humerus 

 at its middle portion twice as great as the lateral diameter, a 

 feature which is not met with in the Felidse even in the lion. 

 Below the deltoid ridge the anterior surface retreats rapidly as 

 it descends, becoming an even convex surface. The supinator 

 ridge is also very bold and is in fact a thin prominent border 

 as far up as the lower portion of the deltoid ridge. Above it, 

 extending in the same line but not connected with it, is a line 

 for muscular attachment, extending to the base of the head. 

 The en t-epi- condylar foramen is large and formed by a free 

 arch, being but slightly depressed into the body of the bone. 

 The trochlea is very similar to that of the lynx but slightly 

 more oblique. The anconeal fossa is deep and large, but not 

 perforated. 



The ulna is practically of the same length as the humerus. 

 Its olecranon is proportionately much longer than in the lynx 

 and lion, being one-fifth the entire length, while in the lynx it 

 is not quite one-eighth, and in the lion a little over one-seventh. 

 The sigmoid cavity is long and defined much as in the cats. 

 Except as to proportions, the ulna presents no especial pecu- 

 liarities. 



