PHRYNOSOMACORNUTA. 57 



The body is short, flattened, ecarinate, 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, suiTounded 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, with 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 with large 

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

 smooth and smafler 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 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. The 

 border between the spines, in which the superciliary ridges terminate posteriorly, 

 Vol. III.— 8 



