Fossil Friday!

Last week, on the Fossil Friday, I gave you a mandible with promises of more to come. But then I had a sort of lousy, rainy week, and ended up wandering into the Pleistocene and like, wow, forget mandibles! I had a close encounter with some pretty awesome sea life. So apologies to those who had anticipated teeth and jaws and bone-crushers galore: those are on hold! 

This week, I bring you a lovely specimen dating from the Pleistocene, found in what is now Virginia. This species is still around today, so you don't need to be a paleo-lover to get it. Can you guess what this little sea dweller (or I should say "dwellers") were?

The first person to identify it (to the species!) wins bragging rights for the week.