Another Ostracod from the Silica Shale sample from Sylvania, OH that I've found is Ulrichia.
A review of the book "Ostracods of the Middle Devonian Silica
Formation" there are several different Ulrichia species. I think
this most closely resembles Ulrichia spinifera based on plate 43 (pg. 270). I collected this from eroded residue of the Silica Shale (Devonian, Givetian stage) near Sylvania, Ohio.