The dentition of the Carnivora varies according to the exclusiveness of their fleshy diet, and the nature of that diet.
In taking two typical forms I give below sketches from skulls in my possession of the tiger, and the common Indian black bear; the one has trenchant cutting teeth which work up and down, the edges sliding past each other just like a pair of scissors; the other has flat crowned molars adapted for triturating the roots and herbage on which it feeds. A skull of an old bear which I have has molars of which the crowns are worn almost smooth from attrition. In the most carnivorous forms the tubercular molars are almost rudimentary.
The skull exhibits peculiar features for the attachment of the necessary powerful muscles. The bones of the face are short in comparison with the cranial portion of the skull (the reverse of the Herbivores); the strongly built zygomatic arch, the roughened ridges and the broad ascending ramus of the lower jaw, all afford place for the attachment of the immense muscular development. Then the hinge of the jaw is peculiar; it allows of no lateral motion, as in the ruminants; the condyle, or hinge-bolt of a tiger's jaw (taken from the largest in my collection), measures two inches, and as this fits accurately into its corresponding (glenoid) cavity, there can be no side motion, but a vertical chopping one only. The skeleton of a typical carnivore is the perfection of strength and suppleness. The tissue of the bones is dense and white; the head small and beautifully articulated; the spine flexible yet strong. In those which show the greatest activity, such as the cats, civets and dogs, the spinous processes, especially in the lumbar region, are greatly developed—more so than in the bears. These serve for the attachment of the powerful muscles of the neck and back. The clavicle or collar-bone is wanting, or but rudimentary. The stomach is simple; the intestinal canal short; liver lobed; organs of sight, hearing, and smell much developed.
Now we come to the divisions into which this group has been separated by naturalists. I shall not attempt to describe the various systems, but take the one which appears to me the simplest and best to fit in with Cuvier's general arrangement, which I have followed. Modern zoologists have divided the family into two great groups—the Fissipedia (split-feet) or land Carnivora, and the Pinnipedia (fin-feet) or water Carnivora. Of the land Carnivora some naturalists have made the following three groups on the characteristics of the feet, viz., Plantigrada, Sub-plantigrada and Digitigrada. The dogs and cats, it is well known, walk on their toes—they are the Digitigrada; the bears and allied forms on the palms of their hands and soles of their feet, more or less, and thus form the other two divisions, but there is another classification which recommends itself by its simplicity and accuracy. Broadly speaking, there are three types of land carnivores—the cat, the dog, and the bear, which have been scientifically named Æluroidea (from the Greek ailouros, a cat); Cynoidea (from kuon, a dog); and Arctoidea (from arctos, a bear). The distinction is greater between the families of Digitigrades, the cat and dog, than between the Plantigrades and Sub-plantigrades, and therefore I propose to adopt the following arrangement:—
I may here remark that the Insectivora are in most cases plantigrade, therefore the term is not an apposite one as applied to the bear and bear-like animals only, but in treating of them under the term Arctoidea we may divide them again into Plantigrades and Sub-plantigrades.
The bears differ from the dogs and cats widely in form and manner, and diet. The cat has a light springy action, treading on the tips of its toes, a well-knit body glistening in a silky coat, often richly variegated, "a clean cut," rounded face, with beautifully chiselled nostrils and thin lips, and lives exclusively on flesh. The bear shambles along with an awkward gait, placing the entire sole of his foot on the ground; he has rough dingy fur, a snout like a pig's, and is chiefly a vegetarian—and in respect to this last peculiarity his dentition is modified considerably: the incisors are large, tri-cuspidate; the canines somewhat smaller than in the restricted carnivora; these are followed by three small teeth, which usually fall out at an early period, then comes a permanent premolar of considerable size, succeeded by two molars in the upper, and three in the under jaw. The dental formula is therefore: Inc., 3—3/3—3; can., 1—1/1—1; premolars, 4—4/4—4; molars, 2—2/3—3. In actual numbers this formula agrees with that for the dogs; but the form of the teeth is very different, inasmuch as the large premolars and the molars have flat tuberculated crowns, constituting them true grinders, instead of the trenchant shape of the cats, which is also, to a modified extent, possessed by the dogs, of which the last two molars have, instead of cutting edges, a grinding surface with four cusps. The trenchant character is entirely lost in the bear, even in the carnivorous species which exhibit no material difference in the teeth, any more than, as I mentioned at the commencement of this work, do the teeth of the human race, be they as carnivorous as the Esquimaux, or vegetarian as the Hindu.
There is also another peculiarity in the bear's skull as compared with the cat's. In the latter there is a considerable bulging below the aperture of the ear called the bulla tympani, or bulb of the drum. This is almost wanting in the bear, and it would be interesting to know whether this much affects its hearing. I myself am of opinion that bears are not acute in this sense, but then my experience has been with the common Indian Ursus, or Melursus labiatus only, and the skulls of this species in my possession strongly exhibit this peculiarity.6 The cylindrical bones resemble those of man nearer than any other animal, the femur especially; and a skinned bear has a most absurd resemblance to a robust human being. The sole of the hind foot leaves a mark not unlike that of a human print.
The Brown Bear of Europe (Ursus arctos) is the type of the family, and has been known from the earliest ages—I may say safely prehistoric ages, for its bones have been frequently found in post-pliocene formations along with those of other animals of which some are extinct. An extinct species of bear, Ursus spelæus, commonly called the Cave Bear, seems to have been the ancestor of the Brown Bear which still is found in various parts of Europe, and is said to have been found within historic times in Great Britain.
The bear of which we have the oldest record is almost the same as our Indian Brown or Snow Bear. Our bear (U. Isabellinus) is but a variety of U. Syriacus, which was the one slain by David, and is spoken of in various parts of the Bible. It is the nearest approach we have to the European U. arctos.
NATIVE NAME.—Barf-ka-rich or Bhalu, Hind.; Harput, Kashmiri; Drin-mor, Ladakhi.
DESCRIPTION.—A yellowish-brown colour, varying somewhat according to sex and time of year. Jerdon says: "In winter and spring the fur is long and shaggy, in some inclining to silvery grey, in others to reddish brown; the hair is thinner and darker in summer as the season advances, and in autumn the under fur has mostly disappeared, and a white collar on the chest is then very apparent. The cubs show this collar distinctly. The females are said to be lighter in colour than the males."
Gray does not agree in the theory that Ursus Syriacus is the same as this species; in external appearance he says it is the same, but there are differences in the skull; the nose is broader, and the depression in the forehead less. The zygomatic arch is wider and stronger; the lower jaw stronger and higher, and the upper tubercular grinders shorter and thicker than in Ursus Isabellinus.
"It is found," Jerdon says, "only on the Himalayas and at great elevations in summer close to the snow. In autumn they descend lower, coming into the forests to feed on various fruits, seeds, acorns, hips