46 



THE NAUTILtJS. 



III. 



As has already been stated, the first post-glacial lakes formed by 

 the retreat of the ice in this region were in the south end of Lake 

 Michigan and the west ends of Lake Erie and Lake Superior, 



FIG. 5. 



bounded on the south by tUe lieigut oi laud and on the north and 

 east by the ice cap. 



Glacial Lake Erie (Lake Maumee), at that period, drained south- 

 west into the Ohio, and as I have already shown in my paper on 



