Abstract
Six fossils, Acanthus minerva, Gyro pipus, Rega elegans, Acanthus exerta, Rega veliforma, and Gyro robusta were found together in a tray at the museum. From an outside label, it is known that Rega veliforma, Acanthus exerta, and Gyro robusta are marine, fresh water, and brackish water species (not necessarily in that order) each from a different locality. Acanthus minerva was collected in Illinois. The fresh water species was collected in New England. Rega elegans is known not to be marine. The fresh water species, and one of the other, which is a marine species, were collected from the same locality. Gyro robusta is larger than the marine species. One of the species of the same genus as the fresh water species was collected in California. Which one is the marine species?
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