A colleague has given me a freshwater shell he collected dead on the Michigan
shore of Lake Michigan in 1962 in shallow water.  He can't recall where. It's on
my web site, http://www.oglethorpe.edu/faculty/%7Ej%5Fcramer/ ; click on
"shells."  It's a rather heavy shell with large, strong cardinal teeth.  I think
it's an elliptio complanata but the shape doesn't fit the pictures I have of
that species very well.  It does not have a posterior ridge, more like several
week ones.  Is the ID just obvious to anyone?

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