On looking at the head of the Koolo, one is struck with the great ears, which are larger than those of the Apes already described, and almost as large as, but less detached, than those of the Chimpanzee. The skull is globular, and with a low contracted forehead receding behind the brow crests; but there are only faint ridges on its sides, although the muscles of the jaw are large, and they come from the sides of the skull. The head is very hairy, and the face, which is very prognathous (Greek, _gnathos_, jaw or mouth), or projecting in front, is black. It is rendered very tigerish and ugly by the flat nose merging into a wide, thick, projecting upper lip, without any furrow; and the mouth looks like a wide slit, there being no chin, on account of the pouting nature of the great lips. Like the other Troglodytes, the Koolo-Kamba has great air sacs or throat pouches, which are hidden amongst the great muscles of the neck, and enter the organ of voice, or the larynx, between the upper and lower structures for the production of vocal sound. Their size and general nature may be satisfactorily compared with those of the Gorilla. (See page 22.) Having something of a voice, this Ape has a better-formed palate than the others, and its tongue has not such a jumble of papillæ or little needle points on it as they have, for the larger cup-shaped ones are arranged at the back in the shape of the letter Y. The last molar tooth of the lower jaw has five cusps. A huge eater of vegetable food, it requires a large stomach, and this has the two openings very close together, that is to say, the one for the passage of food in, and the other for the passage of food out, into the small gut. There is, as in all vegetarians by nature, a large great intestine, enormous, in fact, and this ends, as in man, in a blind gut with an appendix. The cause of all this is that vegetable food does not contain much available nourishment, and large portions of it must come in contact with the mucous or absorbing membrane of the stomach and bowels, in order that a proper quantity of nutritious matter may be absorbed, and be made into blood. The contrary is the case in flesh-eating animals, whose food contains a high percentage of nourishment; for in them the stomach and intestines are small, the surface required not being great, and nature is wonderfully economical. THE SOKO. This animal, both as regards its name, description, and habits, we owe to Livingstone; and the stories which he heard of it from the natives, in the strange country to the west of the great lake Tanganyika, must have wiled away many a weary hour during his ill-health and gradual loss of energy.