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156 side in each jaw, those of the upper having square crowns and various prominent lines, while the crowns of the lower assume the forms of double crescents, except in the hindmost of all, on which the crescent-crown is triple. The canines are either very small or wanting; and the number of incisors varies not only in the different genera, but even in the species of the same genus.

In size, appearance, and habits the genera differ so greatly from each other, that little could be predicated of them in common. Though the total number of species is very limited, they are yet widely scattered over South America, Africa, India and the great Oriental Islands.

The Rhinoceroses are animals of Africa and India, of great size, and massive proportions. There are but three toes on each foot, terminated

SKULL OF RHINOCEROS BICORNIS.

by rounded hoofs. The dental arrangement is as follows in the four Asiatic species,—inc.; can.;