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It is represented in the present seas by the delicate and rare Pentacrinus caput-medusae of the Antilles, which, with Comatula, is one of the few surviving members of the ancient family of the Crinoids, represented by so many extinct genera in the older formations. Scales of Lepidotus gigas. Agass. a. Aechmodus Leachii and Dapedius monilifer. a. Aechmodus. Restored outline. b.
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