Tetragramma variolare
Echinoid
Late Cretaceous (Cenomanian)
Rouen Chalk, Rouen Horizon, Rhotomagense Zone, Acutus subzone
La Heve, La Havre (76), France

46mm echinoid on 98mm chalk slab.

Tetragramma is an extinct sea urchin genus known from the Late Jurassic (Oxfordian) to Late Cretaceous (Turonian).  It’s found in many parts of the world (Texas, Brazil, Europe, north Africa, the Middle East, and Madagascar).