Any thoughts?

[Sfutura]

Hello all! I have looked all over and I can not ID this. Maybe it's nothing but the texture is really cool. It was found in the Chesapeake Bay in Calvert County Maryland. Would love to hear your thoughts. Thank you!

 

Here is the back 

[Carl]

Those are individual, water-worn sand dollar plates.

[Sfutura]

Cool! Thanks Carl!

[ynot]

My But Carl was quick on that one.

Agree with his id.

[Plax]

probably Abertella aberti frags. I don't think the other sand dollars like Melitta were around yet.