from the GNU version of the Collaborative International Dictionary of English

  • A large division of gastropod molluske, including the Pulmonifera and Opisthobranchiata.

from The Century Dictionary and Cyclopedia

  • A prime division of anisopleural gastropods, containing those in winch the visceral nerve-loop is not twisted, as in the opisthobranchs and pulmonifers. It includes the two orders of opisthobranchiate and pulmonate gastropods.


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