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Part of a full-grown compound mass. These fossils, together with numerous species of Zaphrentis, Amplexus, Cyathophyllum, Clisiophyllum, Syringopora, and Michelinia, form a group of rugose corals widely different from any that followed them. Cyathocrinus planus, Miller. Body and arms. Cyathocrinus caryocrinoides, M'Coy. a. Surface of one of the joints of the stem. b.