On a recent trip to collect Carboniferous marine life I came across these brachiopods at an exposure of the Late Mississippian Wymps Gap Limestone/Mauch Chunk Formation. I have read several articles now about the fauna of the Wymps Gap Limestone but have not been able to find an identification that matches. They look a little bit like Leptaena but of course Leptaena had already gone extinct by the Late Mississippian. Any help would be greatly appreciated.