of the tongue; body compressed; legs rather long,
especially the hinder ones; destitute of femoral pores; feet four, with
five toes, the first having two, the second three, the third four, the
fourth five, and the little finger and toe three joints; claws
compressed, hooked; tail long, nearly round, scaly.

This genus appears to be nearly allied to the Agamae, but differs from
them in the peculiar frill that is appended to the neck.

1. Chlamydosaurus kingii (n.s.)

C. corpore luteo, nigro, variegato; squamis carinatis; pennula antice
serrata; cauda corpore duplo longiore.
Chlamydosaurus kingii, Gray manuscripts.
Icon. Table A. Natural size.

Inhabits Port Nelson, north-west coast of Australia.

The colour yellowish-brown variegated with black: the head depressed,
with the sides erect, leaving a blunt ridge on the upper part, in which
the eyes are placed: the ridge over the eyes covered with larger scales
than those over the head; eyes rather small, with a fleshy ridge above
them; eye-lids covered with minute, and surrounded by a delicate serrated
ridge of small upright scales: the lips surrounded by a row of oblong,
four-sided scales, arranged lengthways, the front scale of the upper lip
being the largest: the chin covered with narrow mid-ribbed scales, with a
five-sided one in the centre, and several of larger size just over the
front of the fork of the lower jaw: nostrils, surrounded by rather a
large orbicular scale, situated nearly mid-way between the eye and the
end of the upper jaw, the tubes pointing forwards: the side of the face
has a very obscure ridge extending from the angle of the mouth to the
under part of the ear: neck covered with small scales: frill arising from
the hinder part of the head, just over the front of the ears, and
attached to the sides of the neck and extending down to the front part of
the chest, supported above by a lunate cartilage arising from the hinder
dorsal part of the ear, and in the centre by a bone, which extends about
half its length: this bone appears to be an elongation of the side fork
of the bone of the tongue, but it could not be determined with certainty
without injuring the specimen; each frill has four plaits, which converge
on the under part of the chin, and fold it up on the side, and a fifth
where the two are united in the centre of the lower part of the neck; the
front part of its upper edge is elegantly serrated, but the hinder or
lower part is quite whole; th