31. PHTMATITETJS. — 32. AMBLrEHYKCHUS. 185 



smooth, a little larger and flat on the middle of the back ; ventral 

 scales a little larger, squarish, smooth, in regular transverse series. 

 Limbs short ; the adpressed hind limb reaches the axilla ; digits 

 short and thick. Male with a series of nine or ten pore-like cal- 

 losities in front of the vent. Tail about as long as head and bodj% 

 conical, with whorls of rather large spinose scales. Dark olive, 

 variegated with blackish. 



milliin. inillim. 



Total length 202 Fore limb 42 



Head 21 Hind limb 50 



Width of head 20 Tail 100 



Bodv 81 



Chili. 



a. 2 ■ Chili. C. Darwin, Esq. [P.]. (Type 



of Centrurajlagellifer.) 

 b,c. S- ChiU. 



d. Skeleton. Chili. 



32. AMBLYRHYNCHUS. 



Amhlyi'hynchus Bell, Zoal. Jtnirn. ii. 1825, p. 206; Wiegm. Herp. 



Mex. p. 1C5; Dum. S: Bibr. iv. p. 193; Fitzing. Syst. liept. p. 55. 

 Oreocephalus, Gray, Cat. Liz. p. 189. 



Tympanum distinct. Body slightly compressed ; a dorsal crest ; 

 dorsal scales small. Head with large tubercular shields. No gular 

 pouch ; a feeble transverse gular fold. Digits compressed, with 

 keeled lamellae inferiorly, united at the base by a rudiment of web. 

 A long series of femoral pores. Tail long, strongly compressed. 

 All the teeth trilobate ; pterygoid teeth. No sternal fontanelle. 

 No abdominal ribs. 



Galapagos Islands. 



1. Amblyrhynclius cristatus. 



Oreocephalus cristatus, Gray, Cat. p. 189. 



Amblyi'hjaichus cristatus, Bell, Zool. journ. ii. 1825, p. 206, Suppl. 

 pi. xii. ; Dum. ^Bihr. iv. p. 105 ; Darrrin, Journ. Beayle, p. 466 ; Bell, 

 Zool. Beayle, Bept. p. 2.'{ ; A. Bum. Cat. Melh. Rep< . p. ()2 ; Steind. 

 Festschr. zool.-bot. Ges. Wien, 1876, p. 316, pis. iii., v., vi., vii. 



Iguana (Amblyrhynclius) cristatus, Gray, Grijf'. A. K. ix. Syn. p. 37. 



( ) ater, Gray, I. c. 



Amhlyrliynchus ater, Dum. Sf Bihr. p. 196. 



Hypsilopiius (Amblyrliynchus) cristatus, Fitziny. Syst. Bept. p. 55. 



( ) ater, Fitz. I. c. 



Habit stout. Head small, very convex, nearly as broad as long, 

 with swollen lips; nostril oval, pierced in a small swillen shield 

 nearer the end of the snout than the orbit ; eye and tympauura 



