260 Proceedings of Indiana Academy of Science. 
River in Michigan, and calls attention to a number of other cases that 
have been described. But in this paper this particular type of stream 
piracy is given the name planation stream piracy. The case of the Cut-off 
planation piracy is a clear one, as is shown by the accompanying topo- 
graphic map. It has in it ail 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. 
