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Two ancient mollusks from the Carboniferous Age, the Productus Nebrascensis and the Athyris subtilita.

Ancient Mollusks

Two ancient mollusks from the Carboniferous Age, the Productus Nebrascensis and the Athyris subtilita.

Four varieties of mollusks from the Mesozoic time: "391, Exogyra costata; 392, Inoceramus problematicus; 393, Gryphaea vesicularis; 394, G. Pitcheri." -Dana, 1883

Mesozoic Mollusks

Four varieties of mollusks from the Mesozoic time: "391, Exogyra costata; 392, Inoceramus problematicus;…