836 On the Extinct Cats of America. [ December, 
Descending the scale the number of molar teeth increases at both 
ends of the series in the lower jaw, and anteriorly only in the 
upper, the number of the true molars never exceeding }. The 
following table gives the definitions of the genera. I am unfor- 
tunately ignorant of the characters of the foramina in Pree@lurus 
and Pseud@lurus, as well as in Ælurogale and Eusmilus. 
I. Lateral and anterior faces of mandible continuous; no infe- 
rior flange. 
a. No anterior basal lobe of superior sectorial; inferior sectorial 
with a heel; canines smooth. 
Molars 4 4; inferior sectorial with interior tubercle........... 
Molars 3 +; inferior sectorial without interior tubercle...... 
II. Lateral and anterior faces of mandibles separated by a ver- 
tical angle; no inferior flange; incisors obspatulate. 
a. No anterior basal lobe of superior sectorial; inferior sectorial 
with a heel (and no internal tubercle) ; incisors truncate. 
Molars £ 4; canine smooths os i i es -Archel 
Molars $ 4; canine denticulate. ........... ...- Alurogale 
Nimravus 
Molars $ 4; canine denticulate. 22.61. 20. cecsccccscsentees 
III. Lateral and anterior faces of mandible separated by a vertical 
angle; an inferior flange; incisors conic, canines denticulate.’ ~ 
a. No or a small anterior basal lobe of superior sectorial ;? infe- 
rior sectorial with a heel. No posterior lobes of the crowns of 
the premolars. 
Molar Ep ecri e Sos es i r eres sree o Dinictis. > 
Mols fia ie Since mittens pls Ui vcs sep ceamegesy es west ivan Pogonodon 
MOUS FOR $ oe avis ices cuss teatauetvveemetsneiés . Hoplophoneus. 
Molars ? ? eee Busmilus. 
teeth. (2) In the enlarged size of the superior canine 
In the diminished size of the inferior canine teeth. (4) In the 
conic form of the crowns of the incisors. (5) In the addition of 
a cutting lobe to the anterior base of the superior sectorial tooti 
(6) In the obliteration of the inner tubercle of the lower sectorial ; 
and (7) in the extinction of the heel of the same. (8) In the 
development of an inferior flange and lateroanterior angle of the 
-1 Gervais’ figures of the canines of Eusmilus bidentatus represent no denticula- 
- tions, but the figure is not clear, 
2 Rudimental in Hoplophoneus. 
