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Sea Urchin Fossils
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Description: An illustration of various sea urchin fossils. "1, Palaeechinus; Carboniferous; 2, A plate and radiole of Archaeolcidaris; 3, A radiole of Cidaris; Jurassic; 4, Hemicidaris; Mid. Jurassic; 5, Salenia; Cretaceous; 6, Dyaster; Jurassic; 7, Enallaster; Cretaceous; 8, Catopygus; Cretaceous." -Britannica, 1910
Source: Encyclopaedia Britannica (11th ed., vol. 8) (New York: The Encyclopaedia Britannica Company, 1910) 881
Keywords: sea urchin, echinoderma, echinoidea ,fossils
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