They agree with Du Chaillu in his slight notice of its shape and peculiarities to a certain extent, and in his notice that the arms reach below the knee, that the shoulders are broad, and that the ears are large, but they give some very interesting descriptions of its strange characteristics. It has many points of resemblance with the Gorilla and many with the Nschiego, but it has others which cause it to be like the common Chimpanzee, and which show some likeness to the great Baboon. It fills up the gap in the animal scale between the Nschiego and Gorilla on the one hand, and the true Chimpanzee (_Troglodytes niger_) on the other; and were it not in existence, it would be necessary to divide these Apes into two groups or genera, to make, in fact, a genus Gorilla and a genus Troglodytes, the first to contain the Gorilla and Nschiego, and the last the Chimpanzee. They are all therefore linked together in one genus by it, that of _Troglodytes_. The shape and the peculiar anatomy of the Koolo-Kamba are not simply curious and only interesting to those who study dry bones, for they have to do with its habits and mode of life, and their examination is full of instruction to those who like to understand causes and effects, and design in Nature. Much has been explained in the chapter on the Gorilla regarding the different parts of the body, and if that information is considered there will be no difficulty in comprehending all about the Ape now under consideration. The shape of the body as a whole is admirably adapted for great powers of climbing and of exertion of the limbs, and these last are adapted for the same end in a manner surpassing the great Apes already described. But, moreover, the body is peculiarly suited, not for maintaining or often using the upright position or the legs, but for going on all-fours, like a Baboon or Dog. Doubtless the Gorilla and the Nschiego do often stand up for a short time, and their construction points at this being very possible, as their frame has a combination of structures for doing this and for climbing. Now the Koolo-Kamba must differ from them in its structure, for it requires those which enable it to invariably go on all-fours, and yet to climb better than the others. It never wants to sit down, except with its knees drawn up to its nose, and it squats on its haunch bones (the tuberosities of the haunch--of the “_ischium_” bone).