34 REPTILIA. 



bercles on the sides of the neck. The top of the cranium Is 

 furnished with arched plates; the occiput is tuberculous; the 

 dewlap is moderate, and has but few indentations, and those only 

 before. Laurenti says its habitat is India, but he is mistaken; 

 we have received it from the Brazils, and from Guadaloupe.(l) 



Jg. cornuta,, Cuv.; Ig. comu de St Bomingue, Lace p.; Bonn at. 

 Encyc. Method. Erpetolog. Lezards, pi. iv, f. 4. (The Horned 

 Iguana.) Similar to the Common Iguana, and still more so to 

 the preceding species, but is distinguished by a conical, osseous 

 point between the eyes, and by two scales raised up over the 

 nostrils; the infra-tympanal plate is deficient as well as the tu- 

 bercles on the neck, but the scales on the jaws are embossed. 



Jg. cychlura,C\iv. (The Carolina Iguana.). No infra-tympanal 

 plate or small spines on the neck, but carinated scales, rather 

 larger than the rest, form cinctures on the tail at separate 

 intervals.(2) 



Ophryessa, Boie. 



Small imbricated scales; a slightly salient dorsal crest, extending on 

 the tail, which is compressed; denticulated maxillary teeth, and teeth 

 in the palate: circumstances which approximate them to Iguana; 

 but they have no dewlap, nor femoral pores. 



Lac. superciliosa, L. ; Seb. I, cix, 4; Lophyrus xiphurus, Spix, 

 X, so called from a membranous carina which forms its eye- 

 brow, is an American species, of a fawn colour, with a festoon- 

 ed brown band along each flank. 



Basiliscus, Daud. 



No pores; palatine teeth; the body covered with small scales; on 

 the back and tail a continuous and elevated crest supported by the 

 spinous apophyses of the vertebrae, like that on the tail of the Is- 

 tiuri. 



The species known, Lacerta basiliscus, L., Seb^ I, c. 1; Daud. 

 Ill, xlii, is recognized by the hood-like membranous prominence 

 of its occiput, that is supported by cartilage. It attains a large 

 size, is bluish, with two white bands, one behind the eye, the 



(1) I suspect the .imUyrhynchus cristatus. Bell. Zool. Journ. 1, Supp. p. xii, la 

 a badly prepared specimen of my nudicollis. 



(2) It also appears to me that this Iguana is the same which Dr Harlan (Journ. 

 Acad. Nat. Sc. of Phil. IV, pi. xv,) calls Cychlura carinata,- but in this case there 

 must be some mistake, as in the Amblyrhynchus, relative to the palatine teeth. 

 These teeth exist in all my Iguanas. 



