Each of the jaws consists
of two loosely sutured segments, the articulation of the lower being
much the freer. The gullet is horny and rasp-like, and in its exterior
opening is an auxiliary set of teeth of most remarkable formation.
The upper part of this interior set in some respect resembles the
under jaws of a land animal, but there are marked distinctions.
It consists of two bony structures, slightly curved outwards,
lying parallel to each other and bound together by tough ligaments
which not only permit a certain amount of independent lateral
movement, but also independent action forwards and backwards. Each of
the structures is fitted with a dozen to sixteen closely packed teeth,
and at the rear of each is a magazine charged with five or six more,
ready to move up and forward into position for active service as those
ahead are worn away. The principle of modern magazine rifles is
surprisingly exemplified by these reserve teeth. The lower jaw or rather
dental plate resembles a flattened palate; the whole surface being
studded with teeth, the edges of which overlap. It may be described as a
piece of mosaic work in white and ivory. There are between sixty and
seventy teeth resembling incisors on the dental plate.
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