I have been finding many of these little fossils lately. I found three of them this morning, as a matter of fact. I believe them to be sea urchins, but obviously I'm not sure. I have also found ammonites and bivalve fossils in this area so other marine fossils would make sense to be on the surface in my mind. I placed an iPod into the photo for size reference; it was the only common item at the time of the photo.
Any help would be much appreciated. Thank you.