Skates

A skate egg case. From a Little Skate, Leucoraja erinacea, according to iNaturalist. Found at Jones Beach recently. The species is under assault from the fishing industry, a victim of bait-hunters (for lobstering) and by-catch.
Same day, same beach. This is a skate’s tail.
Folks on iNaturalist have identified this as belonging to the Rough Skates, the genus Leucoraja. Where is the rest of the animal? Possibly butchered for bait — the “wings” are where the meat is — and then discarded.