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Caption
Ferrissia and Laevapex, Great Lakes area. Three species of Ferrissia are in the top row, left to right, F. rivularis, F. walkeri and F. parallela. Laevapex fuscus is in the bottom row.
Dr. John B. Burch, Ph.D.
(photographer, copyright holder), Mollusk Division, Museum of Zoology, University of Michigan

