CLASS 111. ORDER IV V 



ORDER 4, BATRACHIA. 



Having no covering of shells or scales, and fur 

 nished with tivo or four feet. Heart with one au- 

 ricle. 



RANA, (frog,) body four-footed, tail-less, naked ; 

 or with no integument but the skin. 



SALAMANDRA,* (salamander, rain-newt,) body 

 elongated, four-footed, tail long ; head flat, ears 

 concealed under the skin ; 4 toes before, 5 behind. 



PROTEUS, (mud-dragon,) body elongated, four- 

 footed ; tail compressed vertically ; legs short, 

 three toes on the fore feet and two toes on the hind 

 feet. 



SIREN, (siren,) body elongated, two-footed be- 

 fore, no feet behind ; feet with five toes. 



* These three last genera have the general form of lizards : lmtthe> 

 tiave single auricles and naked bodies, or nearly naked. 



