This Specimen has been sold.
4" Jurassic Sea Urchin (Clypeus plotti) - England
This is a large, and very 3D fossil sea urchin (Clypeus plotti) from the Middle Jurassic, Inferior Oolite of England. It's still partially embedded in the rock it was found in, and the base was cut flat so that it displays nicely standing up on a hard surface.
The Inferior Oolite