424: G. I. Adams — Extinct Fclidce of North America. 



The radius is three-fourths the length of the humerus and is 

 a short bone compared with that of the modern eats. Its head 

 presents a distinct notch on the dorsal margin. The bone has 

 sharp lines and the lower portion is quite rugose. The styloid 

 portion is heavy and the process short. The scapho-lunar 

 articular surface is rather smaller than would be expected. 



The manus. — The manus is particularly short and the digits 

 divergent. The scapho-lunar, although not much different 

 from that of the lynx in general structure, is wider and has a 

 better developed tubercle. The line of union of its two ele- 

 ments is visible on its distal surface in the facet for the mag- 

 num. The pyramidal is very seldom preserved with a speci- 

 men, but is fortunately retained in this case. It presents a 

 concave surface for articulation with the unciform. On its 

 external surface are two facets, the proximal for the pisiform 

 and the other for the styloid process of the ulna. It also 

 articulates slightly with the fifth metacarpal. The pisiform is 

 well developed, articulating as in the Felidse with the pyra- 

 midal and ulna. The unciform and magnum need no special 

 description. In the specimen which I have the trapezium and 

 trapezoid are absent. They are present in specimens of 

 Hoplophoneus insolens. The trapezoid in them nearly excludes 

 the second metacarpal from lateral contact with the magnum. In 

 the specimen which I am describing the relation of the meta- 

 carpals is such as to indicate the same position. In this respect 

 the carpus differs from that of the modern cats, in the lion 

 the articulation being very large. The metacarpals are sur- 

 prisingly short, being only about two-thirds as long as those of 

 the lynx. The first metacarpal is about as much reduced as in 

 the lynx or lion. The phalanges are large and the unguals 

 have well developed hoods which are usually preserved. 



The hind-limb. — The femur is the same in length as that of 

 the lynx, but of course much heavier, and its extremities are 

 rather larger in proportion to the strength of the shaft. The 

 head is presented slightly more inward and forward. It pre- 

 sents about the same relative articular surface as the lynx and 

 has a deep pit for the round ligament. The great trochanter 

 is separated from the head by a more distinct notch, which is 

 deepest at the neck. The digital fossa is deep and the posterior 

 border of the great trochanter is reflected over it fully as much 

 as in the lynx. The second trochanter is very prominent and 

 its position is quite different from what it is in the modern 

 cats. It is relatively farther below the head and not as much 

 removed from the inner border of the femur. When the 

 bone is viewed directly from in front a considerable portion of 

 it is seen, while in the recent cats it is concealed by the shaft. 

 The femur also differs from that of the recent cats in having a 



