TAILED BATRACHIANS. 



45 



distinguished from the preceding families by the absence of 

 maxillary bones. Proteus anguinus (fig. 34) inhabits the sub- 

 terranean waters of the caves of Carniola^ and in consequence of its 

 long sojourn in absolute darkness its eyes have become rudimentary 

 and are concealed in the skin, which is devoid of pigment. 



Fis-. 34. 



Fip-. 35. 



Fig. 34. Proteus anfjuinus, from the caves of Carniola. 

 Fig-. 35. Siren lacertina, from North America. 



Sii-en {S. lacertina, fig. 35), a native of North America, possesses 

 only one pair of limbs, viz. the anterior. 



e2 



