from the GNU version of the Collaborative International Dictionary of English

  • A large division of Mollusca, including all except the bivalves; -- so called because the head is distinctly developed. See Illustration in Appendix.

from The Century Dictionary and Cyclopedia

  • A prime division of mollusks, including those with a head, generally provided with tentacles, eyes, and a mouth armed with jaws, as gastropods, pteropods, and cephalopods: same as Cephalophora, 1, or Encephala: the opposite of Acephala.


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