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Cylindrical papershell, Anodontoides ferrussacianus
South Channel Platte River, Lincoln County, 77mm
South Channel Platte River,
Lincoln County, 77mm
South Channel Platte River,
Lincoln County, 77mm
Niobrara River, Dawes County, 60mm
South Channel Platte River,
Lincoln County, 77mm
Cross section of Cylindrical papershell, 80mm, anterior end is to the left