Fossil specimen (hinge fragment) of the oyster *Isognomon maxillata* from the Miocene Choptank Formation of St. Marys County, Maryland (PRI 76763). Specimen is from the collections of the [Paleontological Research Institution](http://www.priweb.org), Ithaca, New York. Maximum dimension of specimen is 11.5 cm. Model by Emily Hauf.