Like both the cats and the dogs, the Hyænas are completely digitigrade; that is to say, they walk only on the extremities of their toes: but these toes are only four in number on each of their feet, and are armed with short, thick, strong, and truncated claws, which are not in the least retractile, and are evidently formed for digging in the earth, a practice to which they are impelled by a horrid and hateful propensity, which we shall have further occasion to notice in describing their habits and mode of life. Their body, in shape much resembling that of the wolf, to which they also approach very nearly in size, is considerably more elevated in front than behind, owing partly to their constant custom of keeping the posterior legs bent in a crouching and half recumbent posture. Beneath the tail, which is short and dependent, they are furnished with a pouch, in the interior of which is secreted a peculiar matter of a very strong and disagreeable smell. Their head is large and broad, flattened in front, and terminating in a short, thick, and obtuse muzzle. Like most carnivorous animals, they are armed in each jaw with six cutting teeth, and two canine, the latter of which are of considerable size and strength. The outermost pair of incisors in the upper jaw are much larger and stronger than the rest, and closely resemble the canine in form. The number of the molar or cheek teeth is five on each side in the upper jaw, and four in the lower; and all of them are remarkable for their extreme thickness and strength in comparison with those of the dogs and cats. Their tongue is similar to that of the latter animals in the roughness which it derives from the sharp and elevated papillæ with which it is covered. Of the genus thus characterized there exist two well marked and unquestionably distinct species, the Striped Hyæna, or Hyæna vulgaris of modern zoologists, which there can be no doubt is also the Hyæna of the ancients; and the Hyæna crocuta, or Spotted Hyæna, the Tiger Wolf of the colonists of the Cape of Good Hope. To these may probably be added a third species, which there is good ground for believing to be distinct, and which has lately been described by Dr. Andrew Smith, the superintendant of the South African Museum, under the name of Hyæna villosa: this is also a native of the vicinity of the Cape, and is denominated by the settlers the Strand Wolf, or Strand Jut. With the two latter we have, however, on the present occasion, no concern; the only animal of this genus in the Tower belonging to the striped race, which inhabits the greater part of Asia and of Africa, penetrating in the former as far as India, and extending over all the northern part of the latter continent. It does not appear that the striped and spotted races are ever found to occupy the same ground; but the territorial limits which separate the one from the other have not yet been distinctly ascertained.