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Saw Toothed Pen Shell

What does the animal inside the pen shell look like? We were very fortunate to be able to collect the shells that had washed up on the beach @ the National Seashore in Corpus.

Wildlife Expert - Ken Burton

Pen shells are bivalves, like scallops, clams, mussels, and oysters. They all look pretty much the same inside the shells; that is, formless masses of organs. The shell is pretty much the only thing holding them together.

Additional information on the web:

Bivalve Anatomy

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