COKDYLtTS GRISEUS.
almost keeled scales; the two lying oyer the external ear tubercular, compressed
(see Plate XXX, fig. 8 a,) and prominent. The scales of the upper
surface of neck, back, and sides disposed in transverse rows, about twenty-
seven in number, each scale quadrangular in shape, and slightly keeled, the
keel posteriorly slightly prolonged beyond the edge of the scale; scales of
the sides of the neck triangular, spinous, and pointed; scales of the tail
arranged in circular rings and each scale strongly carinated, the carina on
the upper and lateral surfaces elongated posteriorly so as to form prominent
spiny points. The fore legs and the upper surface of the hinder ones covered
with triangular carinated scales, each of which terminates in a projecting
point; the lower surface of hinder legs coated with quadrangular smooth
scales, and the hinder surface with small granular ones. Scales between rami
of lower jaw subquadrangular, smooth, and arranged in transverse rows, those
of under surface of neck subovate, and arranged in slightly arched rows.
Plates of under surface of body in distinct transverse rows, twelve in each,
the middle ones larger than the lateral ones. Pre-anal space covered with sub-
quadrangular scales, the two centre ones of the bindermost row largest; immediately
behind anus a band of small somewhat triangular scales, with two
larger ones at each anterior angle, the inner one flat, the outer one tubercular,
pointed, and projecting outwards. Feet small; toes long, slender, and armed
with short, pointed, and curved nails. Femoral pores (Plate XXX. fig. 8 b.)
eight, arranged in one line, and each situated in a prominent warty elevation.
Full grown specimens of this species usually measure from six to seven
inches.
This species is very widely distributed over Southern Africa, and there is scarcely a stony
knoll, a precipice, or an exposed rock which does not afford a habitat for one, two, or more individuals.
In common with others of the genus, it seeks concealment under stones and rocks,
or in the chinks between them, and when- once lodged in such positions it is not easily captured.
The colours of no two individuals are quite the same, therefore naturalists* who do not rest -their
specific characters upon other details, will of necessity be forced to recognize mere varieties
as distinct species.