XXVI DIV. I. VERTEBRATA, 



VERTEBRATA. 



CLASS III.— REPTILIA. 



Reptiles are divided into four sufficiently natural orders ; the 

 Chelonian, Saurian, Ophidian, and Batrachian, severally represented 

 by the Tortoise, the Lizard, the Serpent, and the Frog. The last 

 of these is remarkable for presenting in early life a structure differ- 

 ent from that which it is to assume when adult : thus the young 

 tadpole, it is well known, breathes by gills, and in some genera of 

 this order the gills are never lost. An easy transition is thus 

 formed from the class Reptiles to the subsequent class Fish. 



Class. Order. 



\. Chelonia {Tortoise hind) 



-p 12. Sauria {Lizard kind) 



1 3. Opliidia {Serpent hind) 



4. Batrachia {Frog hind) 



ORDER I.— Chelonia. 



This order contains but one genus, the Linnsean genus Testudo, 

 which has been divided into five subgenera, as follow. 



Genus. Subgenus. Example of Species. 



1, Testudo, prop.'^ 

 Brong. (Land- >T. graeca, L. Common tortoise 

 tortoises) ) 



2. Emys, Brong. ") 

 (Fresh-water v Test, orbicularis, L. Speckled 

 tortoises) / tortoise 



L Testudo, i J S. Che\oma Brong.^ , ,^ 



(Sea-tortoises, or VTest. mydas, L. Green turtle 



turtles) J 



14. Chelys, ^""^er.^ ^est. fimbriata, Gm. Fimbri- 

 (Frog-mouthed V „i,a tortoise 



tortoises) J 



5. Trionyx, Geoff.\Test. triunguis, Forsk. Soft 

 (Soft tortoises). . / tortoise of the Nile. 



