188 REPTILES. 



Bluish brown, with paler blue cross bands, 

 a, b. In spirits. South America. 



c. In spirits. S. America. Presented by the College of Surgeons. 

 Lacerta longicaudata, Cat. 3Ins. Coll. Surg. 194. 

 MM. Quoy and Gaimard are said to have brought this species 

 from New Guinea. 



9. Metapoceros, Wagler. Iguana, Cuvier. 



Head short, convex in front, covered with shields. Muzzle 

 with some tubercular plates. Throat lax, without any distinct 

 pouch, with a cross fold behind. Palate toothed. Teeth 3-lobed. 

 Nape, back and tail crested. Tail long, compressed, covered with 

 equal imbricate shielded spineless scales. Femoral pores in two 

 series, each surrounded by a ring of minute scales. 



The Horned Iguana. Metopoceros cornutus, Wagler, Syst. 

 148. Dum. et Bib. E. G. iv. 211. Iguana cornuta, Latr. Rept. 

 ii. 267. Baud. Rept. iii. 282. Lacep. Q. O. ii. 493. I. tubercula- 

 ta, var. Gray, Griffith, A. K. ix. 36. 



Forehead with a large horn-like tubercle, and between the nos- 

 trils 2 pair of large convex or keeled plates ; dorsal crest very low 

 between the shoulders and interrupted at the loins. 



Inhab. " St. Domingo," Lacepede. Mus. Paris, 1 specimen. 



10. Trachycephalus. Amblyrhynchus, part, Gray, Dum. et 



Bib., Bell. 



Head covered with numerous convex subangular rather small 

 many-sided shields, highest and largest over the sides of the crown 

 and granular over the eyebrows. Lower jaw with regular shields. 

 Body covered with small squarish scales, placed in cross series. 

 Back and tail with a low crest, formed of conical scales, which is 

 interrupted over the loins and longest on the nape. Tail round, 

 tapering, rather compressed at the end, covered with small square 

 keeled scales, in cross series. Femoral pores distinct, each sur- 

 rounded with a series of minute scales. Toes elongate, unequal, 

 with a series of 3-keeled shields beneath, 2 or 3 series of small 

 scales on each side and a row of small shields above. The two 

 middle hinder toes with a series of triangular horny appendages 

 on the inner side, the first hinder toe much the longest, the outer 

 hinder toes short. 



The KouGH Head. Trachycephalus subcristatus. Ambly- 

 rhynchus subcristatus, Gray, Zool. Misc. 6. Zool. Beecheyh Voy. 

 Rept. 93. Darwin, Journal, 469. Amblvrhynchus Demartii, Z>j<m. 

 et Bib. E. G. iv. 197. Bell, Zool. Beagle, i'2, t. 12. 



Scales of the back small, of the outer side of the fore arm and 

 the front of the thigh much larger, conical ; crest of round coni- 

 cal tubercles, those of the back low, of the nape longer, of the 

 tail more compressed. 



