31. PHYMATURUS.—32, AMBLYRHYNCHUS. 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 body, 
conical, with whorls of rather large spinose scales. Dark olive, 
variegated with blackish. 
millim. willim. 
Total length........ 202 Fore limb ...... 42 
Head ti dda ea paws 21 Hind limb...... 56 
Width of head...... 20 PDair yatiesks wishes 100 
Body sas 0a tare samen 81 
Chili 
a. Q. Chili. C. Darwin, Esq. [P.]. (Type 
of Centrura flagellifer.) 
ac. So. Chili. 
d, Skeleton. Chili. 
32. AMBLYRHYNCHUS. 
Amblyrhynchus Bell, Zool. Journ. ii. 1825, p. 206; Wiegm. Herp. 
Mex. p.16; Dum. & Bibr. iv. p. 193; Fitzing. Syst. Rept. 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 lamelle 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. Amblyrhynchus cristatus. 
Oreocephalus cristatus, Gray, Cat. p. 189. 
Amblyrhynchus cristatus, Bell, Zool. Journ. ii. 1825, p. 206, Suppl. 
pl. xii.; Dum. § Bibr. iv. p.195 ; Darwin, Journ. Beagle, p. 466 ; Bell, 
Zool. Beagle, Rept. p.23; A. Dum. Cat. Méth. Rept. p. 62; Steind. 
Festschr, zool.-bot. Ges. Wien, 1876, p. 316, pls. iil., v., vi., vii. 
Iguana (Amblyrhynchus) cristatus, Gray, Grif. A. K. ix, Syn. p. 37. 
) ater, Gray, 1. ¢. ; 
Amblyrhynchus ater, Dum. § Bibr. p. 196. 
Hypsilophus (Amblyrhynchus) cristatus, Fitzing. Syst. Rept. p. 55. 
( ) ater, Fitz. lc. 
Habit stout. Head small, very convex, nearly as broad as long, 
with swollen lips; nostril oval, pierced in a small swollen shield 
nearer the end of the snout than the orbit; eye and tympanum 
