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

Crinoids

Crinoids are a species of Echinoderms: "68, Apiocrinus Royssianus (a, lower part of stem); 69, portion…