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Definitions

from The Century Dictionary and Cyclopedia

  • n. A group of organic structures having the form of oval or circular disks split at one end by a triangular cleft running from center to edge, composed of chitinous matter: originally described as phyllocarid crustacean carapaces and later as the opercula of cephalopods; their real nature is not known. They are found in Upper Devonian rocks.

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