186 REPTILES. 



B. Nostrils lateral^ heloiu the superciliary ridge. Toes simple, 



slender. Iguanina. 



a. Femoral pores distinct. Back crested. Scales generally keeled. 



* Throat-pouch large, compressed. Toes not toothed on the 



outer side. 



6. Iguana, Laurenii. Hypsilophus and Amblyrbyuclius, Wagler. 



Head short, 4-sided, covered with unequal flat or keeled many- 

 sided shields. Lower jaw coveited with large shields. Palate 

 with 2 rows of small teeth. Teeth finely denticulated. Throat 

 with a large compressed pendulous (" not dilatable," Guilding) 

 pouch, toothed in front. Back and tail with a paleaceous crest. 

 Toes unequal, simple, with 3 keeled cross shields beneath. Thigh 

 with a single series of pores. Tail very long, slender, compressed, 

 covered with small equal keeled scales. 



* A large circular plate on side of lower jaw. Hypsilophus, Wagiier. 



The Common Iguana. Iguana tuberculata, Laur. Syn. 49. 

 Lacerta Iguana, Shaw, Zool. iii. 199. I. delicatissima, Latr. R. 

 155. Daud. Rept. iii. 263, t. 40, 277 and 280. I. caerulea, Daud. 

 Rept. iii. 266. Spix, Braz. 7, t. 7. I. sapadissima, Merrem, Tent. 

 49. I. squamosa, Spix, Braz. 5, t. 5. I. viridis, Spix, Braz. 

 6, t. 6. I. emarginata, Spix, Braz. 7, t. 8. I. lophyroides, Spix, 

 Braz. 8, t. 9. 



.Sides of the neck scattered with tubercles ; a large circular 

 plate on the head under the ear; the scales of the end of the muz- 

 zle convex or flat. 



a. Adult, in spirits. West Indies. 



h. Half grown, in spirits. West Indies. 



c. Young, in spirits. West Indies. 



d — g. Young, in spirits. 



h. Young, in spirits. Tobago. Presented by Alfred Ludlam, Esq. 



i. Adult, stufi'ed. West Indies. Presented by J. Turner, Esq. 



k — n. Adult and half grown, stufi'ed. West Indies. 



o. Half grown, stufi'ed. Pernambuco. Presented by J. P. George 



Smith, Esq. 

 p. Young, in spirits. Pernambuco. Presented by J. P. George 



Smith, Esq. 



The Rhinoceros Iguana. Iguana rhinolophus, Weigm. H. 

 Mex. 44. Dum. et Bib. E. G. iv. 207. I. tuberculata, var. 

 Weigm. Isis, 1828, 364. Plumier, MSS. t. 



Muzzle with 3 or 4 conical compressed horn-like scales, one 

 behind the other -, nape with a single longitudinal series of tuber- 

 cles ; head with a large circular plate under the ear. 

 a. Half grown, stufi'ed. St. Christopher's, W. Indies. Presented 



by J. E. Gray, Esq. 



