34 ILLINOIS BIOLOGICAL MONOGRAPHS [34 



Amphiuma resembles Cryptobranchus; and furthermore, the expansion 

 of the ethmoidal column, at its middle to form the lateral parts of the capsule 

 is alike in both. On the other hand, Amphiuma resembles Spelerpes in the 

 size of the planum basale and the inter-nasal space, as well as in the pos- 

 terior development of the ethmoidal column, evidence being lacking on 

 this point in Cryptobranchus. 



