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Rh sors in the upper jaw: the number of incisors below is six; and there are six molars on each side in the upper jaw, and five in the lower, the anterior one of which, small and separated from the rest by a wide space, takes the form of an additional canine. This is, however, wanting in the Llamas.

Besides the usual ruminating structure of the stomachs, the Camels have a peculiar development for the reception and retention of water during long abstinence. "The paunch," observes Mr. Martin, "is divided into two portions by a longitudinal ridge of muscular fibres; in the left is a series of deep cells capable of containing (in the Arabian Camel) four or five quarts of water; in the right is a smaller series holding about a quart. When these cells are

CAMEL'S STOMACH.

filled, the fluid is kept free from mixture with the food by the contraction of the orifice of each cell, and it can be forced out at pleasure by the action of a muscular expansion covering