Crinoids
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Crinoids are a species of Echinoderms: “68, Apiocrinus Royssianus (a, lower part of stem); 69, portion of a mass of crinoidal limestone; 70, Pentacrinus Wyville-Thomsoni.” -Dana, 1883
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Sea Urchins and Sea StarsSource
Dana, James D. New Text-Book of Geology (New York: Ivison, Blakeman & Company, 1883) 65
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