PHRYNOSOMA CORNUTA. §9 



The body is short, flattened, ccarinate, rounded at the sides, and covered with 

 trihedral pointed tubercles, intermingled with small, rhomboidal, carinated and 

 imbricated scales. The vertebral line is covered with about four rows of small, 

 nearly equal sized scales, and appears flattened by reason of the absence of the 

 carinated scales and tubercles found in other parts. On each side the vertebral 

 line, and irregularly disposed in rows of four or five each, are seen large pointed 

 trihedral tubercles, surrounded by others of similar form, but smaller. The 

 flanks are arched outward, and present, from the shoulder to the thigh, two series 

 of spines, of which the upper is larger, leaving a groove between them covered 

 with granulations; these spines give a serrated appearance to the flanks. The 

 thorax is covered with large rhomboidal scales, strongly carinated; the scales of 

 the abdomen are also rhomboidal and carinated, but less distinctly, and of smaller 

 size. 



The tail is broad and flattened at its root, but soon becomes smaller and 

 terminates in a point, and is covered above with large rhomboidal, imbricated 

 and strongly carinated scales, Avith a few small spines about its basis; and below 

 with smooth scales. The vent is transverse, and has small scales both before and 

 behind. 



The anterior extremities are large, and protected in front and above by large 

 rhomboidal, carinated scales, each carina terminating in a spine, and below they 

 are covered with smooth and smaller scales; the fingers are five, distinct, slender, 

 and furnished each with a small, short and curved nail. The posterior extremities 

 are but little longer than the anterior, and are covered in a similar manner, with 

 the exception of having a few large trihedral spines scattered about the superior 

 and posterior part of the thigh and leg; there are five toes, distinct, long, slender, 

 each armed with a short and curved nail. There are six or eight pores on the 

 inferior surface of the thigh, but not well developed. 



Colour. The head above is ash coloured, with a dark bar across the vertex; 

 the forehead is dusky, and the margin of the upper jaw pepper-and-salt grey. 

 Vol. II.— 12 



