LIZARDS. 



189 



a. Young, in spirits. Head-shields convex. Chai'les Island, Ga- 



lapagos. Presented by Charles Dar^\•in, Esq. 



b. Adult, stuffed, Head-shields subangular. Galapagos. Pre- 



sented by Capt. Fitzroy, R.N. 



11. Oreocephalus. Amblyrhynchus, Bell, Gray, not Wayler. 



Head of young covered with moderate subsymmetrical rather 

 convex shields ; of adult, with unequal, conical, high, tubercular 

 shields, those of the muzzle larger, angular, highly conical and 

 rugose, as if formed of agglutinated hairs. Throat dilatable, 

 crumpled, but without any distinct pouch. Body covered with 

 conical tubercular scales, of the adult pointed, rough. Palate 

 toothed? Teeth 3-lobed. Nape and back with a high paleace- 

 ous crest. Tail compressed, covered with whorls of small square 

 keeled scales, and with a crest formed of rhombic compressed 

 scales. Thigh with with 1. or 2 series of pores, each in the centre 

 of a scale. Toes strong, rounded and simple on the sides, with 

 smooth band-like shields beneath, the middle ones united by a w^eb 

 at the base, the middle hind toes with a series of triangular horny 

 processes on the inner side, the outer hinder elongate, nearly as 

 long as the others, and with a large compressed claw. Claws 

 large. 



The Marine Oreocephale. Oreocephalus cristatus. Am- 

 blyrhynchus cristatus. Bell, Zool. Journ. ii. 204, t. 12. Zool. Bea- 

 gle, Rept. 23. Gray, Z. M. 6. Danvin, Jour. 466. Dum. et Bib. 

 E. G. iv. 195. A. ater, Gray, Griffith, A. K. ix. 37. Dum. et 

 Bib. E. G. iv. 196. Iguana, Scolder, Brewster's Jour. Sci. v. 213. 



Dorsal crest formed of elongate compressed scales ; scales of 

 the back moderate, conical, acute, of the outer side of the fore legs 

 scarcely larger, acute. 



a. Adult, stuffed. Scales of the dorsal crest round, conical, cross 



waved. Galapagos. Presented by Capt. Fitzroy, R.N. 



b. Half grown, stuffed. Scales of the dorsal crest compressed. 



Galapagos. Presented by Capt. Fitzroy, R.N. 



A. ater, Gray, Griffith, A. K. ix. 37! Dum. et Bib. E. G. 

 iv. 196. 



c. Adult, stuffed. Lost the scales of the head. Galapagos. 



d. Young, in spirits. Head-shields few, moderate, unequal, sym- 



metrical, convex, the central ones of the forehead keeled, those 

 over the eyebrows small, convex, crest of the nape formed of 

 blunt subcylindrical scales, of the back of small low compress- 

 ed triangular scales, of the tail like those of the back but lar- 

 ger, squarer, and forming a nearly even line ; scales of the 

 body small, conical, blunt, smooth, equal. Charles Island, 

 Galapagos. Presented by Charles Darwin, Esq. 



