EXTINCT CATS. z&9Q 
ing link between the preceding one and ZLusmilus. The fore- 
foot is remarkable for the small size of the first toe, and the 
scapho-lunar bone of the carpus, or wrist, still retains traces of 
its dual origin which are totally lost in all existing Cats. The 
femur has a third trochanter, the hind-foot resembles that of 
Dinictis, and the tail is of unusual length. The genus is re- 
presented by five species, two of which occur in the White 
River beds of Nebraska and Colorado, and the other two in 
the overlying strata of the John Day River in Oregon. All 
are about the size of a Lynx. 
XI. GENUS PSEUDALURUS. 
Preudelurus, Gervais, Zool. et. Pal. Franc. vol. i. ps ¥27 
(1848-50). 
The present is the first of two genera from the Midd’e 
Tertiary deposits differing so remarkably from all the forms yet 
noticed, that it is a question whether they have any right to a 
place in the present family at all, and whether their affinities 
are not rather with the Viverrine Cvyptoprocta. If, as some 
writers consider to be the case, they are the direct ancestors 
of the typical Fe/ide, there will be no question that the latter 
Family is clcsely connected with the Viverride, and has not 
been independently derived from the primitive Creodont Car- 
nivora (see p. 22). In these genera there are three or four 
pairs of pre-molar teeth in each jaw, while in the upper jaw there 
is one pair, and in the lower two pairs of molars, the lower car- 
nassial tooth having a cutting posterior heel. The slender 
lower jaw differs from that of the preceding group in that its — 
lower border is highly convex instead of straight, and the front 
surface rounded in place of being squared. ‘The limbs are 
relatively long, and the five-toed feet partially digitigrade. The 
dentition is more Cat-like than in all living Viverride, in spite 
of the presence of four pre-molars in both jaws, and of a second 
lower molar. The skeleton, however, presents so many primitive 
7 U 
