>     The pictures really helped.  Looks rather "fat" to be an U. imbecillis.
> In addition, periostracum is rather dark for this species.  The ones from
> the Miss. R. have a rather pale skin.  I agree with Fred that they seem to
> be Pyganodon.

Down here, imbecilis tends to be greenish, but still not dark brown.
Also, there are beaks, albeit low ones-imbecillis has practically
none.  Pyganodon is my call, too.


--
Dr. David Campbell
425 Scientific Collections
University of Alabama
"I think of my happy condition, surrounded by acres of clams"

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