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Productus giganteus. Carboniferous Limestone.
A, Interior of dorsal valve.
B, Interior of ventral valve.
C, Transverse section of valves.
D, Hinge line of A:
a, occlusor scars; d, divaricator scars; i, "reniform impressions"; ca, cardinal process; h, hinge line; p, brachial prominence; s, cavity for spiral arms; do, dorsal valve; ve, ventral valve

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