SAURES. IGUANID^. 373 



Brachylophus Cuv. Gular pouch small ; general cha- 

 racters of Iguana; but the tail is very long and 

 slender, almost entirely rounded, and covered with 

 small equal imbricate scales * ; back with a low spinal 

 crest j palate toothed : 3 sp. 

 fasciatus Cuv. Erp. Gen. iv. 226. rhombifer. Spix, pi. 11. 



Iguana. Toes free, unequal, and simple, without ap- 

 pendages ; palate furnished with two ranges of teeth, and 

 a single row of compressed triangular teeth with in- 

 dented edges in each jaw ; body and tail more or less 

 compressed, covered with small imbricate scales, f 



Ophry(Essa Boie. General form of Brachylophus and 

 Iguana, but the back and tail is strongly crested. 



O. superciliosa. Spix, pi, 10. 



Iguana Latir. Gular pouch very large ; dorsal and 

 caudal crest spinous ; tail long, compressed ; palate 

 with two rows of teeth; caudal scales equal, im- 

 bricate, and carinated. 



I. tuberculata Laur. Seba, i. pi. 95. fig. 1. 



Basiliscus Laurenti. Occiput prolonged into a large, 

 obtuse, cap-hke crest ; dorsal and caudal crests, in 

 the males, very large, and with bony excrescences ; 

 toes long, the sides fringed ; tail sometimes not 

 crested. 



B. mitratus. Seba, i. pi. 101. 1. cristatus. Seba, i. pi. 94. 1. 



Amblyrhynchus BeU. Toes thick, short, and nearly 

 equal ; throat loose, but without a gular pouch ; a 

 dorsal crest on the back and tail. 



A. cristatus Bell. Zool. Journ. 204. pi. 12. 



Aloponotus Dum., Bibron. The upper part of the 

 body destitute of scales, but the back and tail cari- 



* This character, but for the palatine teeth, would place this sub-genus 

 among the Agamidce; at present, I consider it the passage between Poly- 

 chrus and Iguana. 



f The teeth in the palate separate these lizards from the Agamidce, but 

 both groups require a more perfect analysis than they have yet received, 

 especially in reference to the sub-genera. 



B B 3 



