te GLASS lil, ORDER IV.. 
ORDER 4. BATRACHIA. 
Having no covering of shells or scales, and jur- 
nished with two 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 fiat, 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; but they 
haye single auricles and naked bodies, or nearly naked. . 

