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Inoceramus is a genus of bivalve belonging to a family which became extinct near the end of the Cretaceous Period. Inasmuch as the Inoceramids of the Pierre Shale have not been studied recently, I am not attempting to assign them to species. (Length 5.5 cm.)
Some Inoceramids grew to enormous sizes. A picture of one of them, said to be the largest bivalve in the world is on display at the website of the Geological Museum of the University of Copenhagen. Another large Inoceramid can be seen at the website of the Emporia State University Geology Museum in Emporia, Kansas.
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