248 REPTILES. 



19. Physignathus, Cuv. Lophura, part, Grai/. 

 Istiurus, part, Dum. et Bib. 



Head pyramidical, quadrangular, swollen behind, covered with 

 small equal keeled scales. Paratoids with ridges of large acute 

 scales. Superciliary edges keeled. Nostrils lateral. Ear-drum 

 superficial, exposed. Throat-pouch small, with an angular plait 

 in the front of the neck. Back and tail with a regular crest of 

 compressed scales. Tail compressed. Femoral pores distinct. 



Cuvier's Physignathus. Physignathus concinnus, Cuv. 

 R. A. ii. 41, t. 6,f. 1. Lophura concinua. Gray, Griffith, A. K. 

 ix. 61. P. Iguauoides, Cuv. Mus. Paris. Istiurus Physignathus, 

 Dum. et Bib. E. G. iv. 307. 1, Cochinchinensis, Guerin, Icon. t. 

 9,/. 1. Loph. Cuvieri, Gray., Griffith, A. K. ix. 60. 



Cheek with 3 or 4 large tubercles behind ; back sharp-edged ; 

 scales of the sides very small, equal, of the head very small, deep- 

 ly grooved, of the belly smooth ; the scales of the back-crest of the 

 adult elongate and becoming closer, and the back edge of the low- 

 er jaw is much swollen. 



Inhab. Cochinchina. 



Lesueur's Physignathus. Physignathus Lesueurii. Lo- 

 phura Les. Gray, Syn. Rept. Griff. A. K. ix. 60. Dum. et Bib. 

 E. G. iv. 384, t. 40, f. 1,1 a. 



Grey-brown, with large black spots ; scales of the back une- 

 qual, of the head small, rhomboidal, keeled, of the end of the muz- 

 zle similar to those behind them, of the belly keeled ; the back 

 angular. 



rt, b. Adult, stuffed. Australia. 



b. Scales irregular, imbricate. Australia. 



* Neck with a frill- like expansion on each side. 



20. Chlamydosaurus, Gray. 



Head pyramidical, 4-sided, covered with small subequal keel- 

 ed scales. Throat not pouched. Ear-drum superficial. Neck 

 with a large plaited membrane on each side, covered with scales, 

 and toothed on the edge. Nape with a rudimentary crest. Back 

 not crested. Scales imbricate, keeled, those of the sides smaller. 

 Legs strong. Toes 5-5, unequal. Femoral pores distinct. Tail 

 elongate, tapering, not crested. 



The frill increases in size compared with the size of the ani- 

 mal as it grows in age ; in the young, it does not reach to the 

 base of the fore limbs, in the adult it becomes much fuller, and 

 reaches considerably beyond the axilla. 



