Page:Natural History, Reptiles.djvu/268

260 skin differs from that of the Amphibia generally, being covered with minute hard granules, among which are scattered small conical tubercles of a horny substance. The male has an enormous larynx, which takes the form of a triangular bony box, within which are two moveable bones, which can close the divisions of the

windpipe, and thus influence the intonation of the voice.

Two species of this singular reptile are known, of which we shall adduce only the Surinam Toad (Pipa Surinamensis, .). This is much larger than our Toad, growing to six or eight inches in length; it is of a dark brown colour,