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462 DENTAL ANATOMY.

same as in the domestic cat, but in the former the first premolar in the
upper jaw has a single fimg, whei-eas in the latter this tooth is two-
rooted. Upon these characters two genera have been established. The
clouded tiger of India has a dental formula like that of the lynxes, and
approaches the " sabre-tooth division " in the enlargement of the supe-
rior canines, by reason of which it has also been given a generic rank.
The hunting leopard, or cheetah, forms another genus, and is distin-

FiG. 243.

Cranium of Smilodon necalor, (lervais, one-third natural size (after Cope).
guished by the absence of the internal tubercle of the superior sectorial.
All the other cats are very much alike, and can be distinguished from
one another only specifically, being classified, therefore, under the genus
Felis.