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. 
