598 REPTILES. 



TRIBE I, — CROCODILID*. 



Genus I.— G AXIAL A.— Cuvier. 



Generic Character. — Muzzle contracted, cylindrical, greatly elongated, 

 spatuUfonn towards the point, tip acute ; teetli nearly equal ; hind legs ser- 

 rated on the external margin ; feet palmated to the claws. 



Gaviala Gangetica. — Gaugetie Crocodile. Plate Ixii. fig. 4. Muzzle as 

 long as the head, contracted ; superior jaw with 23 teeth on either side, 

 lower jaw with 25 ; neck protected by two carinated plates ; eyes very 

 large ; cranium with a deep indentation behind the eyes. Eighteen feet 

 long. Inhabits India. 



Genus 2.— CROCODILU&— Cj^caer. 



Generic Character. — Muzzle oblong, conoid, depressed ; teeth of unequal 

 length, fourth tooth in the under jaw lying along a groove in the upper ; legs 

 serrated ; feet palmated. 



Crocodi7us<>!i/g-am.— The Common Crocodile. PlatelxiLfig. 5.— TheEgg, 

 lig. 6. Described, vol. iv. p. 116. 



Genus 3.— ALLIGATOR.— Cuvier. 



Generic Character. — Snout broad and blunt; teeth unequal, the fourth on 

 each side of the lower jaw produced, and received into a cavity in the upper 

 one ; feet half webbed, and not denticulated. 



Alligator sclerops. — The Alligator. Plate Ixiii. fig. 1. Described, vol. iv. 

 p. 116. 



TRIBE n.— LACERTINIDX- 



Genus t.— MONITOR.— Cwme?-. 



Generic Character Scales on the head, abdomen, and t^l, small and im- 

 bricated ; tail laterally compressed ; teeth in both jaws, but having none on 

 the palate. 



Section 1.— Tail flattened with a carinated ridge. 



Section II.— Tail nearly rounded, with a dentated ridge on its upper side. 

 Inhabits New Holland. 



Section III.— Tail nearly rounded, without a ridge. 



Genuj 5.— DRACGENA.—C«iv>r. 



Generic Character.— Head furnished with angular plates ; scales on llie 

 hack large, broad, and carinated, which are sti-ongly serrated on the tail; 

 scales on the throat small ; abdominal and caudal scales rectangular; tail 

 ruuu d at its base, and compressed towards its point ; tongue bifid. 



Braccena Guianensis. — The Guiana Dracoena. Plate Ixiii. fig. 2. Head 

 »mall , tapering ; neck thick, body round, and the tail very long; colour 

 brown, inclining to chestnut, paler on the abdomen, which is marked with 

 numerous small yellow spots. Inhabits Guiana; 



Genus 6.—TElVS.—Merrem. 

 Generic CTortJcter.- Back scales smooth and small, a row of pores under 



