Shells from Lake Erie

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Hi everyone.  I am from Canada and recently bought a place by Lake Erie, so I've been enjoying the beach and finding shells.  Mostly they are freshwater mussels etc but I have two I cannot identify.

Sorry the pic is not the best my camera isn't very good.  They are both small-the one on the left is fingernail sized.

<img src="http://img22.imageshack.us/my.php?image=hpim1204g.jpg" alt="http://img22.imageshack.us/my.php?image=hpim1204g.jpg" style="border:0" />

Thank you  <img src="images/smiley/smile.gif" alt="" border="0" />