DKS MO INKS ACADEMY OF SCIENCE. 



57 



(1) By this term are designated those species which also occur in waters with- 

 out the drainage area of the Mississippi river system. 



(2) This term will serve to indicate those species which are described from 

 Louisiana without explicit local reference and concerning which, in the absence 

 of local specimens, it is impossible to decide as to their occurrence east or west 

 of the Mississippi. 



CATALOGUE 35. 



