852 On the Extinct Cats of America. [ December, 
The classification of the family is as follows : 
I. The anterior and lateral faces of the mandible separated by 
an angle. 
a. Inferior border of mandible flared downwards in front. 
&. Inferior sectorial without heel ; an anterior lobe of the supe- 
rior sectorial, and posterior lobes of the premolars. 
Premolars 3, first inferior two-rooted. .......ceeesesseecees Drepanodon. 
2 
Premolars Soy first inferior one-rooted...........csccevessees Smilodon. 
II. The anterior and lateral faces of the mandible continuous, 
convex. (No inferior tubercular molar.) : 
a. Inferior sectorial without heel; premolars with posterior 
lobes; superior sectorial with anterior lobe. 
& Superior sectorial without internal heel; ungual phalanges 
without inferior process. 
Pupil round, premolars 2; orbit open posteriorly Cyne@lurus. 
#8. Superior sectorial with internal heel; ungual phalanges 
with inferior process. 
y. Pupil round, 
Prenola Dd Oo 00k ily kk s ca Petes V3 O14 GASES a Uncia. 
E T E E E tik ch E has T oe Neofelis. 
yr. Pupil vertical. 
Orbit closed behind; premolars 2.. TERRE Catolynx 
Orbit open ; premolars 2 P Felis. 
Orbit open; premolirs is uesa sin cos ed's sled okey rs i a Lynx. 
The tendency to reduction of the number of molar teeth is seen 
in the above genera, as already pointed out in the Nimravide. 
The only extinct genera are Drepanodon and Smilodon. Of the 
other genera the greater number of extinct species belong to 
ncia. 
The following catalogue of species and their distribution shows 
that but few of the extinct Felide have yet been found in North 
America. A star on a line between two columns shows an inter- 
mediate stratigraphical position. The extinct true cats whose 
crania have been discovered, belong to Uncia, but it is possible 
7 that some of the European species, which are as yet only known : 
from lower jaws, may be species of the genus Feks or Lynx. 
