29 i 
REPTILES. 
pressed, triangular, and serrated teetli; with two small rows on 
the posterior margin of the palate; body and tail provided with 
small imbricated scales; back with a carina of pointed scales ; 
throat with an inflated, laterally compressed, and pendulous ap¬ 
pendage ; a row of femoral spiracles. 
Iguana nudicollis. — The Bare-Necked Iguana. 
Head with rounded plates; side of the neck devoid of tuber¬ 
cles ; pouch without dentations. 
Genus 20.—POLYCHRUS. — Cuvier. 
Generic Character. —Head covered with small plates ; maxil¬ 
lary teeth sharp and serrated, having small ones in the palate; 
throat capable of inflation and extension ; back without a crest; 
body and tail with small scales. 
Polychrus marmoratus. — The Marbled Polychrus. 
Brownish-gray, marbled with ferruginous irregular transverse 
bands; tail very long. Inhabits Guiana. 
Genus 21.—ANOLIUS. — Cuvier. 
Generic Character. — Generally provided with a gular pouch ; 
teeth sharp and serrated, with small ones in the palate ; claws 
greatly hooked ; tail shagreened with small scales. 
Section I.—Tail crested. 
Anolius bimaculatus .— The Two-Spot Anolius. 
Body green, spotted with brown upon the muzzle and sides ; 
each shoulder with a black spot. Inhabits South America. 
Section II.—Tail round. 
TRIBE IV.-GECKOTIDiE. 
Genus 22. — GECKO.— Daudin. 
Generic Character. —Body and head depressed ; eyes large ; 
tongue fleshy and not extensible; jaws with a row of numerous 
small and close teeth ; skin covered with small shagreen-like 
scales, and frequently tuberculatcd below with smaller flat and 
