I wonder if that's just a piece of rubble that may have been attached to the byssal threads - and it's just let go of it now that it's attached to something "better" (your rock). Otherwise, if that's a part of the clam itself, I too have no idea what it is...
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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