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. 



Fig. .34. Fig. 35. 



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

 Fig. 35. Siren lacertina, from North America. 



Siren (S. lacertina, fig. 35), a native of North America, possesses 

 only one pair of limbs, viz. the anterior. 



E2 



