

Help ID - Seen on Capri, Italy
Hello! Saw this inclusion in limestone on a hike on Capri, Italy today. About 40-50 feet above sea level. I know all of this used to be underwater. Is it just a bivalve, or something else? It almost looks like spongy bone in the middle, or like it’s tooth-shaped, but I think my imagination could be getting the better of me 😆
Thank you!