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The enormous Reptile from which this genus derives its name belongs to the same subdivision of that class as the agile Lizard and the many-hued Cham?leon, with which it was comprehended by Linn?us under the single generic title of Lacerta. This group has subsequently been elevated to the rank of an order, consisting of numerous genera, among which the Crocodiles are distinguished by the following characters. Their toes are five in number on the anterior feet, and four on the posterior; their sharp and conical teeth are arranged in a single series in each jaw; their tongue is flat, fleshy, and closely attached almost to its very edge; and their bodies are clothed with large, thick, square scales, the[232] upper of which are surmounted by a strong keel, those of the tail forming superiorly a dentated crest, double at its origin.

THE ZEBRA OF THE PLAINS.

joint action of[158] these three powerful organs. By means of this combination they will, when flying from danger, take a succession of leaps of from twenty to thirty feet in length and six or eight in height; but even in their more quiet and gradual mode of progression they also make use of their tail in conjunction with their four extremities. The fore feet are furnished with five toes, each terminating in a moderately strong and arcuated claw. The hinder extremities, on the contrary, have only four toes, the two interior of which are united together so as to form the appearance of a single one furnished with two short and feeble claws; the third is long, of great strength, and terminated by a large and powerful claw having the form of a lengthened hoof; and the fourth, the most external of the series, is similar in character to the third, but of much smaller dimensions. The head and anterior part are small and delicate, and appear quite disproportioned to the robust posterior half of the body; and this dis