81.
This Lizard, which was first described in the excellent journal of Mr.
White, does not appear to be uncommon on the coast of Australia, as there are several specimens both in the British Museum and in the collection of the Linnean Society, that were probably taken in the neighbourhood of the colony; the specimen before me was caught at Seal Island, in King George the Third's Sound.
The scales of the whole of the body are broad, hexangular, with five or six longitudinal, slightly-raised ridges, which gradually taper, and are lost just before they reach the margin.

The legs are short, thick; the toes of the fore-feet are rather short, the outer reaching to the middle of the second, the second and third equal; the fourth reaching to the last joint of the third, and the little one to the second joint of the fourth finger.

In the hind foot the first and third toe are nearly equal, and only half as long as the second; the fourth only half as long as the third; and the fifth about half the length of the fourth toe.
Genus TRACHYSAURUS.

Gray.
Pedes quatuor pentadactyli.
Caput sub-scutatum, dentes in palato nulli.
Truncus supra sqoamis crassis elongatis subspinosis, infra hexagonis membranaceis imbricatis, tectus.
Cauda brevis, depressa.
This genus is at once distinguished from the former, and indeed from the whole of the Scincidae, by the large hard scales that cover the back of the body and head; which are formed of distinct triangular long plates, rough on the outside, and covered with a membranaceous skin.

The body shields of the head pass gradually into the dorsal plates.