Gautheria radiata
Echinoid
Late Cretaceous (Upper Turonian)
Rouen Chalk, Leskei biozone
Dieppe (76), France

20mm on 96mm chalk slab.  Echinoderm.

Gautheria is a genus of regular echinoid known from the Late Cretaceous of western Europe.  A “regular” echinoid has neither a front nor back end and can move in any direction.  They tend to be the thicker or more spherical-shaped forms.