The members of this genus may easily be recognised by their very Dog-like face, their muzzle being greatly elongated and truncated at the end, with the nostrils set in the truncated termination. Their eyes are directed downwards along the visage. In form and massiveness of body and in length of tail they vary very much. Their fore- and hind-limbs are nearly equal in length, and consequently they progress on all fours, with the palms of the hands and the soles of the feet flat to the ground. Their "fore-paws" are, however, very efficient _hands_, which some species use very dexterously in turning over stones in their search for food. Their feet are long. Their hair is grizzled or ringed with various colours. The facial region of the skull is more developed in this genus relatively to the flattened brain-case, than in other Monkeys. In several of the species longitudinal osseous ridges are developed on the bones of the upper jaws, especially in the adult males, adding to the hideousness of the countenance of these animals. The neck is elongated. The _radius_ is longer than the _humerus_ (or arm-bone), and the elbow projection of the _ulna_ (of the fore-arm), named the _olecranon_ process, is prolonged upwards beyond what occurs in Man. The thumb, though relatively shorter than in Man, is much {254}longer proportionately than in other Monkeys, reaching to the middle of the first joint of the forefinger. Both halves of the liver are much sub-divided. Gestation lasts seven months, and the young are suckled for six months. The Baboons are the lowest of the Catarrhine or Old World Monkeys. Most of them are large, ferocious, dangerous, and gregarious animals, and when disturbed or alarmed they give utterance to screams, barks, and guttural murmurs.