This genus is distinguished from the true Skinks by the want of Palatine teeth, the shorter body, and the holes of the ears being furnished on their front part with a fringe. It differs from the succeeding Genus, Trachysaurus, in the head being covered with distinct flat plates, and the whole of the body with cut hexangular scales; the scales are harder than those of the true Skink, but not so distinctly bony as those of the Trachysaurus.
4. Tiliqua tuberculata. Gray.
Lacerta scincoides. Shaw, Nat. Misc.
Lacerta occidua. var. Shaw, Zool. iij. 289.
Scincus tuberculatus, Merrem. Syst. Amph. 73.
Scincoid, or Skink-formed Lizard, White, Journal 242.
Icon. White, l. c. t. 30. Shaw, N. M. t. 179; Zool. iij. t. 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. The teeth short, thick, and conical; the palate toothless. The belly and lower surface of the tail are covered with large six-sided scales, like the other genera of the family. The head is rather large, triangular. The legs short, weak; the toes very short, covered only with as many scales as there are joints; the outer and innermost being about half as long as the three central toes, which are nearly of equal length; claws short, conical, channelled beneath. The tail short, depressed.
5. Trachysaurus rugosus (n.s.)
T. squamis dorsi rugosis, caudae subspinosis; cauda brevissima.
The body nearly uniform, chestnut brown; the head depressed with the scales convex, and more nearly of an equal size than usual: those round the eyes and mouth large; the three anterior scales on the edge of the lower jaw larger than those which cover the lower surface of the head, body, and tail, which are uniform, distinct, large, and membranaceous: the scales of the back are nearly of equal size with those covering the commencement of the tail; they are furnished with a prominent midrib, and end in a point. The legs very short, compressed, covered with nearly smooth, rather thin, scales. The toes very short; claws rather thick, and short. The tail about half the length of the body.
Head, three inches long.
Body, seven inches.
Tail, four inches.