from The Century Dictionary.
- An order of gastropods, including those which breathe air in a closed chamber lined with pulmonic vessels: applied by J. E. Gray to the typical pulmonates or pulmonifers, and including most of the inoperculate landshells as well as the fresh-water forms related to them
- In Lamarck's classification (1819), a section of gastropods, containing his family Limacea.
- In Gray's classification (1821), a subclass of Gasteropodophora, comprising all terrestrial gastropods, and divided into Inoperculata and Operculata.
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