Hello. We did some exploring yesterday and found our way to the St Johns River in Deland. I love shells and picked a nice heavy fossil up that was lying near the water in the sand. Picture is attached. I think it is a Spiny Jewel Box without its spines but it is at least 2.5" and I can not find any documentation that said they were that big. Can anyone tell me if it might be something else?
Thank you.