ARE both natives of South America; they live in large troops, feeding on roots, fruits, and insects, and are much more gentle than those of the old world. Of the _Capuchin_ there are many species, differing from each other in colour only; they are very lively, active, and amusing, and about a foot long. The Spider Monkey, like the Capuchin, has a long prehensile tail, which it uses like a fifth hand. Nature seems by this addition to have more than recompensed them for the want of a thumb, for by it, when they are unable to leap from one tree to another, on account of the distance, they form a kind of chain, with their young upon their backs, hanging down by each other’s tails. One of them holds the branch above, and the rest swing to and fro like a pendulum, until the undermost is enabled to catch hold; the first then lets go his hold, and thus comes undermost in his turn; in this way they can travel a great distance without ever touching the ground. Curious illustrations of this are daily seen at the Zoological Gardens, where there are several of these Monkeys. [Illustration: THE OUISTITI AND MARIKINA MONKEYS. (_Jacchus vulgaris_ and _Rosalia_.)] THE OUISTITI, or MARMOZET, inhabits the Brazils, and is of small size, not measuring more than seven inches, though his tail is near eleven; he weighs about six ounces, and, like others of his kind, lives not only on vegetables, but also upon insects, the eggs of birds, and even small birds. His face is almost naked, of a swarthy flesh colour, with a white spot above the nose; the tail is full of hair, and annulated with ash-coloured and black rings alternately; his nails are sharp, and his fingers like those of a squirrel. The MARIKINA is a beautiful little animal, not above nine inches long, and is sometimes called the Lion Monkey; his hair is long, soft, and glossy; his head is round, his face brown, and his ears hid under the long hairs which surround his face, and which are of a bright red, while those on his body and tail are of a beautiful pale yellow, or gold colour. He is very playful, and of a seemingly robust temperament, for we have seen one which lived five or six years in Paris, without any other particular care than keeping it during the winter in a chamber in which there was a fire every day. [Illustration: THE LEMUR AND THE MONGOOS, (_Lemur macaco_ and _Lemur albifrons_,)]