134 CLASS REPTILIA. 



some scales larger than the rest, and a little cari- 

 nated, form, from space to space, cinctures upon the 

 tail.* 



Ophryessa. Boi^. 



Have small imbricated scales, a dorsal crest, some- 

 what projecting and prolonged over the tail, which 

 is compressed ; maxillary teeth denticulated, and 

 teeth in the palate, all which circumstances approxi- 

 mate them to the iguanas ; but they have no cuticu- 

 lar appendage, nor pores in the thighs. 



Lac. Superciliosa. L, Seb. I. cix. 4. Lophyrus 

 Xiphurus. Spix, X. 



Thus named in consequence of a membranous keel 

 which forms its brow, is an American species, fawn- 

 coloured, with a festooned brown band along each 

 flank. 



The Basilisks. Basiliscus. Daud. 



Are destitute of pores, and have palatal teeth, like 

 the ophryessge. Their body is covered with small 

 scales. There is on their back and tail a continuous 

 and elevated crest, supported by the spinous pro- 

 cesses of the vertebrae, like that of the tail of isti- 

 urus. 



* It also appears to me that this iguana is the same that Dr. Harlan 

 (An. of Se. Nat. de Philad. iv. pi. 4) calls cychlura carinata; but then, as 

 in ^eamblyrhyncus, there must be some error relative to the palatine teeth. 

 I am satisfied that these teeth exist in all my iguanas. 



