I have not found too many Gastropods in the Centerfield mbr. of the Ludlowville Formation, but when I do it's just two genera: Platyceras and Nanticonema (formerly Platystoma).
This is a small Platyceras sp. gastropod
And this is a typical Nanticonema sp. gastropod.
Both specimens were found near East Bethany, NY. The Ludlowville Formation is Devonian in age (Givetian stage).