112 CLASS REPTILIA. 



The Great Dragon. Mon. crocodilinus, Merr. 

 Lacep. Quadr. Ovip. pi. ix. 



Has also scales elevated with ridges scattered over 

 the back. The teeth in the bottom of the mouth 

 grow round with age. It attains from four to six 

 feet in length, and inhabits Guiana, in burrows, 

 near marshes. Its flesh is eaten. 



The Lizardet^ Daud. Lac. Bicarirnata, L. Croco- 

 dilurus jdmozonicuSi Spix, pi. xxi. 



Is smaller, and has no raised scales on the back. It 

 is found in many parts of South America. 



The second, or 



The Safe-Guards, 



Has all the scales of the back and tail without keels. 

 The teeth are notched ; but with age, those of the 

 hinder mouth grow round also.* 



Some, more especially, called Safe-guards, have 

 the tail more or less compressed. The scales of 

 the belly are more long than broad. They live on 

 the banks of waters. 



Such, most particularly, is 



* To these M. Fitzinger reserves the name Monitor. 



