We’re not certain exactly what species of sea urchin this is, as specimens often look very alike. But it could be Camerogalerus cylindricus, which is found throughout the Cenomanian. Mature specimens of this species are quite large, from 45-60mm, with straight sides and a distinctive domed profile. Juveniles are more button shaped. Very similar species include Camerogalerus minimus which is found throughout the lower and middle part of the Turonian and grows to about 15-20mm – or it could be Discoides subuculus, also from the Cenomanian.
Find out more about sea urchins on the echinoderms pages.