CLASS REPTILIA. ' 



Smooth-necked Guana. Iguana Delesatissima, Laur. J 

 Nudicollis, Merrem. Mus. Bresl. 1. 13. f. 1. 



Sides of neck smooth ; front of dewlap slightly toothed ; 

 sides of lower jaw with small plates. Brazils and Gauda- 

 loupe. 



2. Tail equally scaly ; toes unequal ; head shield, Jlat- 

 ish ; dewlap entire. Brachylophus. (Les Brachylophes.) 

 Cuv. 



Banded Guana. Iguana (Brachylophus.) Fasciatus, 

 Brongn. Bui. Soc. Philom. t. 61. f. 1. 



Green, brown banded. South America, not Java, as said by 

 Brongniart. Mus. Brit. 



4. Tail compressed, with rings of spinous scales ; toes 

 nearly equal ; head shields convex. Amblyrhynchus, 

 Bell. 



Rough headed Guana. Iguana {A.) Cristatus, n. Bell. 

 Zool. Jour. i. t. 12. 



Brown, sides and belly yellow ? Galapagos. 



Black Guana. Iguana {A.) Ater, nob. 



Nearly black ; beneath dusky. Galapagos. 



B. Ribs simple, throat xvith a cross fold. 



I. Head long, scutellated ; back crested ; tail with rings of 

 spinous scales ; back with square scales ; femoral pores 

 distinct. Cyclura nob. 



Palate toothed. Ctenosaura. Weigmann. 



Cycluroid Guana. Iguana. (Ctens.) Cycluroides. n. Cteno- 

 saura Cycluroides. Wiegmann, Iris xxi. 



Dorsal crest continued ; scales of back and sides, obsoletely 



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