Collyrites elliptica lamarck.
This Echinoid has a peculiar feature. The petaliferous zone is split into 3 at the rear and 2 at the front instead of the normal pentameral central arrangement.
Jurassic, middle Callovian.
Perche, Orne, Normandy, France.
Echinoid : 3.2 x 2.7 cm.
