SALAMANDEKS AND NEWTS. 73 



(Necturus maculatus, 462), in which the eyes are functional and each 

 limb is four-toed. The thick stalks of the three pairs of external 



Fig. 72. Fig. 73. 



Fig. 72. The Olm (Proteus anguinus), from the caves of Carniola. (No. 554.) 

 Fig. 73. _ The Mud-eel (Siren lacertina), from North America. (No. 555.) 



gills are brown, but the terminal fringes during life are blood-red. 

 A specimen is exhibited. 



