PHRYNOSOMA CORONATA. 99 



entirely in wanting the three or four rows of small scales on the vertebral line, 

 in place of which it has large scales and spiny tubercles. The flanks are furnished 

 with a double row of spines; the upper is much the larger, and makes a serrated 

 margin from the anterior to the posterior extremities. The scales on the thorax 

 and abdomen are large, rhomboidal and smooth, terminating posteriorly in a point. 



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

 is depressed in its whole length, and covered above with scales and pointed 

 tubercles, as on the back; and below, with large rhomboidal scales, elongated in 

 points posteriorly. On each lateral margin of the tail is a very remarkable range 

 of large trihedral flattened spines, which gives to the tail a strong and regularly 

 serrated border, unlike any other of this genus that I have observed. 



The anterior extremities are well developed, and protected in front by large, 

 elongated, rhomboiddl scales, carinated and pointed, even to the roots of the nails; 

 their under surface is covered with small, smooth, rhomboidal scales; there are 

 five fingers, distinct and slender, each with a short and curved nail. The 

 posterior extremities are but httle larger than the anterior, and are covered in the 

 same way, but have strong spines along the superior and posterior part of the 

 thigh. The toes are five in number, large, distinct, and furnished each with a 

 short and curved nail. On the under surface of the thigh is a range of sixteen or 

 eighteen pores. 



Colour. The head above is light brown, with a few dusky blotches; the upper 

 jaw is grey. The three inferior spines that surround the head are light, and the 

 two central spines are dark chestnut. The ground colour of the neck and body 

 above is pepper-and-salt grey, with a lighter vertebral line from the occiput to near 

 the extremity of the tail, but frequently interrupted by transverse dusky bars; nor 

 is it perfect in other parts, as it contains several spines, which are all dark; on 

 each side of this line at the neck is an oblong dark chestnut blotch, reaching to 

 the shoulders, broad before and narrow behind. Behind these are four bands, with 

 irregular margins, which traverse completely the vertebral line, but are there less 



