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from the GNU version of the Collaborative International Dictionary of English

  • n.pl. An extensive artificial division of gastropod mollusks, including those that breathe by gills, as contrasted with the Pulmonifera.

from The Century Dictionary and Cyclopedia

  • In Lamarck's latest classification, a division of gastropods, distinguished from Pneumobranchiata, and containing species which breathe water only. The section imperfectly corresponds to the nudibranchiates, inferobranchiates, and tectibranchiates of Cuvier.


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