186 IGUANIDE. 
small; upper surface of head covered with large convex or conical 
and spinose, rough, polygonal shields; rostral and mental very 
small; ten to twelve upper and as many lower labials. Throat 
strongly plicate, covered with minute granular scales. A dorso- 
nuchal crest of lanceolate spines, highest on the nape, sometimes 
subinterrupted between the shoulders. Scales on the body very 
small, keeled on the back, smooth on the belly. Limbs strong; 
digits rather short, the third toe strongly denticulated along the 
inner side of the basal joint. A series of twenty to thirty pores on 
each side; frequently a second parallel series of a few pores. Tail 
about once and a half the length of head and body, strongly com- 
pressed, crested above, covered with cross series of equal keeled 
scales, Colour black or blackish brown; abdomen and lower sur- 
face of thighs frequently dirty white; young brown above, with 
pale spots or dots, and more or less distinct darker cross bands on 
the back. 
centim. centim. 
Total length ...... 133 Fore limb ........ 22 
PCB 5s iain in tee 0 9 Hind limb........ 27 
Width of head .... 9 SNAIL! “asaesheore vied fates 80 
BODY siieseier hee Sects 44 
Galapagos Islands. 
a,b,c. Ad. & hgr., Galapagos. Capt. Fitzroy [P.]. 
stuffed. 
d. Yg. Galapagos. J. Goodridge, Esq. [P.]. 
e. Her. Galapagos. Haslar Collection. 
jf. Her., stuffed. Galapagos. 
g. Skull of f. 
h. Yg. Galapagos. 
a, k,l, Ad. Charles Island. Commander W. E. Cook- 
son [P.]}. 
m. Ad. Iguana Cove. Commander W. E. Cook- 
son [P.]. 
n. Ad., stuffed. Iguana Cove. Commander W. E. Cook- 
son [P.]. 
o. Skeleton of n. 
p. Ad. Tagus Cove, Albemarle. Commander W. E. Cook- 
son [P.]. 
q-s. Hgr. Abingdon Island. Commander W. E. Cook- 
son [P.]. 
33. CONOLOPHUS. 
Amblyrhynchus, part., Dum. & Bibr. iv. p. 198. 
Conolophus, Fitzing. Syst. Rept. p. 55. 
Trachycephalus (non Tschudi), Gray, Cat. Liz. p. 188. 
Tympanum distinct. Body a little depressed; a slight dorsal 
crest; dorsal scales small. Head-scales slightly enlarged. No gular 
pouch; a feeble transverse gular fold. Digits compressed, with 
keeled lamelle inferiorly. A long series of femoral pores. Tail 
