THE ALLIGATOR.

Crocodilus Lucius. Cuv.

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 Alligators constitute a natural subdivision of the genus, in which the snout is broad, blunt, and less produced than in the true Crocodiles; the fourth tooth on each side of the lower jaw enters a hole in the upper when the mouth is closed; and the toes are only half-webbed. They appear to be exclusively natives of America. The present species is distinguished by its broad and flat snout, with nearly parallel sides, united in front by a curved line; by the peculiar arrangement of its nuchal scales; and by the elevated internal margins of its orbits. Its colour is dark brown above, and somewhat lighter beneath. It is one of the most dreadful scourges of the countries which it inhabits, preying upon all kinds of animals that come within its reach, and sometimes even upon man himself. Our specimen was apparently very young, not measuring more than three feet in length; but during two years that it was kept in the Menagerie it was not observed to have at all increased in size. It was fed once a week upon raw beef.