Æluroidea
This section includes the Cat family (Felidæ); the Hyænas (Hyænidæ); two families unknown in India, viz. the Cryptoproctidæ and the Protelidæ; and the Civet family (Viverridæ).
Felidæ — The Cat Family
This family contains the typical carnivores. There is in them combined the greatest power of destruction, accompanied by the simplest mechanism for producing it. All complications of dentition and digestion disappear. Here are the few scissor-like teeth with the enormous canines, the latter for holding and piercing the life out of their prey, the former for chopping up the flesh into suitable morsels for swallowing. Then the stomach is a simple sac, undivided into compartments, and the intestine is short, not more than three times the length of the body, instead of being some twenty times longer, as in some herbivores. This family has the smallest number of molars, a class of tooth which would indeed be useless, for the construction of the feline jaw precludes the possibility of grinding, and therefore a flat-crowned tuberculous tooth would be out of place. As I have before described it, the jaw of a tiger is incapable of lateral motion. The condyle of the lower jaw is so broad, and fits so accurately into its socket, the glenoid cavity, that there can be no departure from the up and down scissor-like action. The true Cats have, therefore, only one molar on each side of each jaw; those in the upper jaw being merely rudimentary, and placed almost at right angles to the rest of the teeth, and seem apparently of little use; those of the lower jaw are large and trenchant, cutting against the edge of the third upper premolar.
It may interest my readers to know which are premolars and which are molars. This can be decided only by dissection of the jaw of a young animal. True molars only appear as the animal approaches the adult stage. They are never shed, as are all the rest of the teeth, commonly called milk teeth. The deciduous or milk teeth are the incisors, canines, and premolars; they drop out and are replaced, and behind the last premolar comes up the permanent molar.
Another peculiar feature of the Cat family is the power of sheathing their talons. Claws to a cat are of as great importance to him in the securing of his prey as are his teeth. The badger is a digger, Hodge, who carries his mattock on his shoulder; but the feline is the free-lance whose sword must be kept keen in its scabbard, so by a peculiar arrangement of muscles the points of the claws are kept off the ground, while the animal treads noiselessly on soft pads. Otherwise by constant abrasion they would get so blunted as to fail in their penetrating and seizing power. I give here an illustration of the mechanism of the feline claw. In the upper sketch the claw is retracted or sheathed; in the lower it is protruded as in the act of striking.
The senses of hearing and smell are much developed, and the bulb of the ear (bulla tympani) is here found of the largest dimensions. I have once before alluded to this in writing of the bears, in whom this arrangement is deficient. I give here a section of the auditory apparatus. I do not know whether the engraver has effectually rendered my attempt at conveying an idea, based as it is on dissections by Professor Flower; but if he has failed I think the fault lies in the shakiness of my hand in attempting the fine shading after nearly breaking a saw and losing my temper over a very tough old skull which I divided before commencing my illustration. The great cavity is the bulla tympani or bulb of the ear; a m is the auditory meatus or external hole of the ear. On looking into a dry skull the passage seems to be of no great depth, nor can an instrument be passed directly from the outside into the great tympanic cavity, the hindrance being a wall of bone, s, the septum which divides the bulla into two distinct chambers, the reason for which is not very clear, except that one may suppose it to be in some measure for acoustic purposes, as all animals with this development are quick of hearing. The communication between the two chambers lies in a narrow slit over the septum, the Eustachian tube, e, being on the outside of the septum and between it and the tympanum or ear drum, t.
The above are the chief characteristics of the family. For the rest we may notice that they have but a rudimentary clavicle imbedded among the muscles; the limbs are comparatively short, but immensely muscular; the body lithe and active; the foot-fall noiseless; the tongue armed with rough papillæ, which enables them to rasp the flesh off bones, and their vision is adapted for both night and day.
None of them are gregarious, as in the case of dogs and wolves. One hears sometimes of a limited number of lions and tigers being seen together, but in most cases they belong to one family, of which the junior members have not been “turned off on their own hook” as yet.
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