The Echinoid Directory

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Pileus hemisphericus Desor, 1856 [=Pileus pileus (Agassiz, in Agassiz & Desor, 1847)]; Museum National d'Histoire Naturelle, Paris, B12291. Oxfordian (Corallian), Upper Jurassic, Coulanges-sur-Yonne, Yonne, France. Oral view.

Length of test 100 mm.