mol. 7—77—7; = 36; but the African species are destitute of incisors as well as canines. The skull is
remarkable for the pointed elevation of the summit,
and for the enlargement of the bones of the nose,
which are of an unexampled size and thickness;
they are united into a kind of arch, overhanging
the front of the jaw, and intended to give support
to a solid horn, which forms the most obvious characteristic of this genus, being seated on the nose.
In all the African species, and in one of the Oriental, there is a second horn; but, totally unlike
what prevails universally in other horned quadrupeds, they are not arranged transversely, but longitudinally ; the second, which is for the most
part very inferior in length, being placed immediately behind its fellow. The horn, or horns, are
as peculiar in their structure as in their position.
They are not, as in the Ruminants, bony projections, parts of the skeleton, surrounded by skin
or by a corneous case; but are solid appurtenances
to the skin, composed of parallel fibres, of the
nature of hairs, glued together, as it were, into a
dense and compact mass. This fibrous texture is
very manifest at the base, but at the tip it is less
apparent, this part being always worn down by
continual rubbing, and bearing a considerable
polish.
The skin is excessively thick and coarse, and destitute of hair; and in the Asiatic species, falls in massive folds round the neck, behind and across the shoulders, and before and across the thighs; in these also, it is studded with rounded tubercles; both these peculiarities are wanting in the African species, which might indeed, on many accounts, constitute a separate genus. The Su-
