M-650 PEN SHELL, Atrina rigida or A. serrata - Gulf Specimen Marine Lab

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Observations on Pearls Reportedly from the Pinnidae Family (Pen Pearls)

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Atrina pen shell bivalve (Algiers Beach, Sanibel Island, F…

Seashells by MillhillThe Interesting Iridescent Pen Shell

Japanese Shellfish 8: Pen Shell-Tairagi-玉珧

Pen Shell (Large Saltwater Clam) when broken has this gorgeous rainbow, Marine Biology

Pen shells have a tremendous potential' – Meghan McCoy

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