GENERAL VIEW. 19 



(Coluber, &c.), the tree-snakes, the sea-snakes, and 

 the very poisonous rattle-snakes (Crotalus], and 

 Cobras, together with all other Serpents. 

 IV. CHELONIA. An order containing the Land Tortoises, 

 the Sea Turtles, and other fresh-water Terrapins, 

 including the Matamata and the European Einvs. 

 V. ICHTHYOSAURIA. A group made up of the extinct 

 Ichthyosauri of the ancient seas. 





FIG. 27. AN IcHTHYosAfRus. FIG. 28. A PLESIOSALRUS. 



VI. PLESIOSAURTA. An order for the similarly extinct 



marine reptiles, the Plesiosauri. 



VII. DICYNODONTIA. Containing the genus Dicynodon. 

 VIII. PTEROSAURIA. The extinct Reptiles of the air, which 

 flew like our existing bats, and consisted of the 

 genera Pterodactylus, Rhamphorhynchus, &c. 

 IX. DlNOSAURlA. An extinct order of large Reptiles, one 

 of which, the Iguanodon, has left its bones on the 

 Wealden formation of the south of England. Igua- 

 nodon, Compsognathus, and Megalosaurus are other 

 interesting forms. 



The class Batrachia is made up of four well-marked 

 orders : 



I. ANURA. The Frogs and Toads a very uniform group, 

 some genera of which, Ceratophrys, Ephippifer, 

 Dactylethra, Pipa, &c. will be referred to hereafter. 

 II. URODELA. Or the Efts and Newts, amongst which the 

 Menopoma, Menobrancli us, 

 the two-limbed Siren, and 

 the Proteus of the Austrian 

 caves are worthy of special FlG . 29 ._ TH E GREAT NORTH 



mention. AMERICAN EFT, WITH 



III. OPHIOMORPHA. This order ^SS NTGILLs( ^ w<; ' 



contains limbless Batra- 



chians with very .elongated bodies, having much the 



appearance of small snakes. 



IV. LADYRINTHODONTA. These creatures are entirely 



extinct, and form the genera Labyrinthodon, Arche- 

 . gosaurus, &>c. 



The class Pisces has within it all the Fishes, properly so 

 c 2 



