422 G. I. Adams — Extinct Felidce of North A 



merica. 



anterior to the canine and one about twice as great posterior to 

 it. There are three superior premolars ; the anterior one (p 2 ) 

 is considerably! the smallest and may lack distinct anterior and 

 posterior cusps. The second ( p 3 ) is well developed but may 

 not have a distinct anterior cusp. The third (p 4 ) is the sec- 

 torial. This tooth is different from that of the lynx or lion in 

 not possessing an internal cusp ; the inner root, however, sup- 

 ports a convex buttress which descends from the principal 

 cusp. There is also an anterior basal cusp which is rather 

 incipient and situated high on the principal cusp. The pos- 

 terior cusp is a long cutting heel. The upper molar is rather 

 better developed than in the modern cats and is inserted as in 

 the lion by two roots in a transverse line. The incisors of the 

 lower jaw along with the canines form a regularly curved 

 series, the canines being not much larger than the external 

 incisors. The internal incisors are much compressed and in 

 some specimens are hardly more than rudiments. They are 

 slightly divergent and have the same general structure as the 

 upper ones. The canine is curved slightly backward and has 

 a rather stronger posterior border. Its greatest diameter is 

 nearly in an antero-posterior line. It is also denticulate when 

 unworn, but the border soon becomes smooth. Back of the 

 canine there is a diastema about twice as great as in the upper 

 jaw. There are two well developed premolars, the anterior 

 being, however, considerably the smaller. The inferior molar is 

 a sectorial and differs from that of the modern cats in having a 

 low heel and a somewhat variable postero-internal cusp. The 

 teeth of the molar series differ from those of the modern cats 

 in being more compressed and in having sharper borders 

 which when unworn are feebly crenulated. 



The vertebrae. — There are sixteen presacral vertebrae of one 

 specimen, all of which are considerably mutilated so that it is 

 possible to judge only of the relative size and length of the 

 centra. They indicate a much stronger vertebral column than 

 that of the lynx and one which is proportionately shorter in 

 the lumbar region. Five lumbar vertebrse measure considera- 

 bly less than any five of same region of the lynx. On the 

 other hand, the cervicals are longer than those of the lynx and 

 the axis particularly so. The thoracic vertebrae are, as near as 

 can be judged from comparison with those at hand, a little 

 longer and, proportionately to the other vertebrae, also more 

 massive. From what I know of other representatives of the 

 genus I think it safe to say that the processes were stout and 

 well developed. The sacrum, as would be expected, is heavier 

 and wider than that of the lynx and its centrum is not so 

 much depressed. The caudals are not preserved in the speci- 

 mens of this species, but from the other species it is evident 

 that the tail was long like that of the recent cats. 



