260 Procced'uHjs of Indiana Academy of Science. 



River in Michigan, and calls attention to a niuuber of otlier cases tliat 

 have been described. Bnt in this paper this particular type of stream 

 piracy is given the name planation siream piracy. The ease of the Cut-off 

 planation piracy is a clear one, as is shown by the accompanying topo- 

 graphic map. It has in it all the phases of any case of planation stream 

 piracy. For these reasons the Cut-off planation piracy may well serve as 

 the type case of planation stream piracy. 



