Found on the shoreline of the Illinois River, all my attempts to identify the species of snail this shell belongs to have come up empty handed. If you are reading this and have an idea, I would greatly appreciate your insights.

Leicaflex SL, 90mm Elmarit-R with macro bellows, Kodak XX 5222, 200 ISO.

Leicaflex SL, 90mm Elmarit-R with macro bellows, Kodak XX 5222, 200 ISO.