. The cat : an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. CHAP. XII.] DIFFERENT KINDS OF CATS. 433 individuals of this genus, the first inferior premolar may ha\e but one root, or may even be wanting altogether, thus carrying the reduction of lower teeth to an extreme. In the development of the upper canines the Machaerodonts are separated from the general condition of the cat tribe, not merely in that they were so immense, but that their length necessitated a peculiar mode of use, so that. Fig. 1S4.—Skull of Mach^rodus smilodon. these creat
. The cat : an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. CHAP. XII.] DIFFERENT KINDS OF CATS. 433 individuals of this genus, the first inferior premolar may ha\e but one root, or may even be wanting altogether, thus carrying the reduction of lower teeth to an extreme. In the development of the upper canines the Machaerodonts are separated from the general condition of the cat tribe, not merely in that they were so immense, but that their length necessitated a peculiar mode of use, so that. Fig. 1S4.—Skull of Mach^rodus smilodon. these creatures may be said to have initiated a new and very special modification of cat-existence. § 16. Another fossil form of cat has been named Hoplophonetjs * by Professor Cope, who represents it as like Machaerodus in having the mandible vertically expanded and the upper canines more or less largely developed, but as differing from it and from all existing cats in that the inferior sectorial has a posterior lobe or "heel/' while the superior sectorial has no anterior lobe, such as that which exists (Figs. 12 and 46) in all living cats. Its upper molar is largely developed (Fig. 185, B) and there is no inferior tubercular molar. It is a miocene genus, founded on fossils from the White Rivers of Nebraska and Colorado. * See Annals and Magazine of Natural History for January, 1880, p. 39 ; see also Bulletin of the United States Geo- logical Survey, 7th Report, p. 509 ; and the Proceedings of the Acad, of Nat. Sc. of Philadelphia, July 8, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mivart, St. George Jackson, 1827-1900. New York : Scribner's
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