Heterocentrotus trigonarius (Lamarck, 1816), sea urchin or pencil urchin, dried specimen

Meoma ventricosa (Lamarck, 1816), sea urchin, dried specimen

Echinus sp., pedestal model of the internal anatomy of a sea urchin, from Les Fils d'Emile Deyrolle, Paris, France

Echinoidea, sea urchin, dried specimen, Aneitium, New Hebrides

Fossil heart sea-urchin, Micraster cortestudinarium, from the Upper Cretaceous Epoch of England

Cidaris cidaris (Linnaeus, 1758), spiny urchin, dried specimen

Fossil sea urchin, Melonechinus sp., from the Carboniferous Period of Missouri, USA

Fossil sea urchin, Clypeaster sp., irregular, from the Tertiary Sub-Era of near Giza, Egypt

Echinus sp., sea urchin, dried specimen

Mellita sp., sea urchin, dried specimen, Captiva Island, Florida, Gulf of Mexico, July 1980

Fossil heart urchin, Epiaster gibbus, from the Upper Chalk of the Upper Cretaceous Epoch of England

Fossil sea urchin, Hemicidaris intermedia, from the Jurassic Period of unknown locality

Fossil sea urchin, Coelopleurus coronalis, regular, from the Eocene Epoch of France

Fossil sea urchin, Clypeus ploti, irregular, from the Jurassic Period

Fossil sea urchin, Phymosoma koenigi, from the Upper Chalk of the Upper Cretaceous Epoch of England

Echinoidea, sand dollar, flat sea urchin, dried specimen, Whispering Sands, Siesta Key, Florida, Gulf of Mexico, Atlantic Ocean