When I was a kid I used "periwinkle" to refer to a small bivalve that is numerous in the littoral zone of Florida beaches. When a wave recedes they furiously dig into the sand. I think now they are probably coquina Donax variabilis (http://www.carnegiemnh.org/mollusks/images/biv_mar/2c62.jpg) and I called them periwinkles because sometimes they have that light blue-purple color.
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timeasmymeasure
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Date: 2006-11-24 02:07 pm (UTC)