Tylocidaris clavigera (Mantell, 1822) cast of a sea urchin fossil found in the Coniacian of the White Chalk subgroup in England. The creature existed in the Cretaceous Period (Late Turonian to Santonian). Cast is on display at the Smithsonian National Museum of Natural History as of June 2023.
The genus was named by Pomel in 1883.
I photographed this same specimen in 2010 and posted about it. It is interesting how camera technology as changed. My cell phone picture taken in 2023 is far from perfect. I might start letting it save the RAW images and see how they compare.
https://louisvillefossils.blogspot.com/2010/08/tylocidaris-clavigera.html