Olivier Caro wrote:
> Yes, some answers I receive propose Donacilla cornea.
> It's the right pattern, the right "milky" fat layer inside valves, but
> the general shape is strange...

* wear, nibbling, or breakage around the edges of the valves can
sometimes make a bivalve surprisingly hard to recognize.

for what this is worth,

fred.
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             Bishops Mills Natural History Centre
           Frederick W. Schueler & Aleta Karstad
        RR#2 Bishops Mills, Ontario, Canada K0G 1T0
     on the Smiths Falls Limestone Plain 44* 52'N 75* 42'W
       (613)258-3107 <bckcdb at istar.ca> http://pinicola.ca
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