CLASS EEPTILIA. 



keeled ; of sacrum mucronate. Palatine teeth many, small ; 

 tail very long and round, crested with a series of spines. 

 Mus. Berl. 



Spiny Tailed Guana. Iguana. (Ctenosaura) Acanthura. 

 Lac. Acanthura. Shaw. Zool. iij. 326. Cyclt^ra 

 Shawii, Gray Ann. Phil. 



Pale brown ; dorsal crest interrupted over the sacrum ; 

 tail cylindrical^ with a ring of depressed scales between each 

 ring of spiny ones ; palatine teeth few, large. Mus. Brit. 



Armed Iguana. Iguana (Ctenosaura) Armata. 



Head long, pyraraidical ; tail with rings of spines, having 

 two rings of depressed scales between them at the base ; 

 teeth three or five lobed ; palatine teeth small, in one row. 

 Mus. Bell. 



Allied Iguana. Iguana (Ctenosaura) Similis. 



Grey, black dotted, body with four oblique dark bands ; 

 occiput forming a concave band behind ; dorsal crest low 

 but continued over the sacrum. Teeth blunt, three lobed ; 

 palatine on two raised lines on each side. Head two, body 

 nine inches. Mus. Bell. 



Lancet Toothed Iguana. Iguana (Ctenosaura) Lanceolata, 



Grey, black dotted. Tail black banded, base black spotted ; 

 head scales rather large, convex ; dorsal crest, completely 

 interrupted over the sacrum. Palatine teeth, in two bunches ; 

 the teeth of the jaw, long lanceolate sharp-edged, two or 

 three lobed ; femoral pores six. Length of body and head 

 fourteen, of tail twenty-four inches. Mus. Bell. 



BelVa Iguana. Iguana (Ctenosaura) Bellii. Gray MS. 



Grey, black netted ; dorsal and caudal crest of short, broad 

 scales, interrupted over the sacrum. Scales of the occiput and 

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