• WordNet 3.6
    • n Pulmonata large order of gastropods usually breathing by means of a lung-like sac comprising most land snails and slugs and many freshwater snails
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Webster's Revised Unabridged Dictionary
    • n. pl Pulmonata (Zoöl) An extensive division, or sub-class, of hermaphrodite gastropods, in which the mantle cavity is modified into an air-breathing organ, as in Helix, or land snails, Limax, or garden slugs, and many pond snails, as Limnæa and Planorbis.
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Century Dictionary and Cyclopedia
    • Pulmonata In conchology: An order or subclass of Gasteropoda, air-breathing and adapted to a terrestrial life; the true pulmonate or pulmoniferous gastropods, as snails and slugs, having the pallial cavity or mantle-chamber converted into a lung-sac, no ctenidia or true gills, and generally no true operculum to the shell. Some other gastropods are pulmonate in the sense that they breathe air, but are otherwise structurally related to the pectinibranchiate or to the rhipidoglossate gastropods. The Pulmonata are hermaphrodite, with highly developed copulatory and other sexual organs in every individual, and well-formed odontophore. A shell is usually present, sometimes small or wanting; its aperture is closed in some cases by a pseudoperculum. They are divided into Basommatophora and Stylommatophora. There are more than 6,000 species. By Férussac and many later conchologists the order was extended to include the operculate tænioglossate and rhipidoglossate terrestrial gastropods, the true Pulmonata being then called P. inoperculata, and the others P. operculata. This use of the word was long prevalent, but is now obsolete. Also called Pulmonca, Pulmonifera, Pulmonogasteropoda, and Pulmogasteropoda.
    • Pulmonata A section of rhipidoglossate gastropods, characterized by adaptation for aërial respiration, and including the families Helicinidæ, Hydrocenidæ, and Proserpinidæ.
    • Pulmonata In entomology, the pulmonary arachnidans: same as Pulmonaria, 2.
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Chambers's Twentieth Century Dictionary
    • n.pl Pulmonata an order or sub-class of Gasteropoda, air-breathing
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Webster's Revised Unabridged Dictionary
NL., from L. pulmo, -onis, a lung
Chambers's Twentieth Century Dictionary
L. pulmonariuspulmo, pulmonis, a lung—Gr. pleumōn, pneumōn, lung.


In literature:

In aquatic Pulmonata the osphradium is retained.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5" by Various
The Family Succinea really ranks with the land shells, as belonging to the sub-order Pulmonata or lung-breathing molluscs.
"Our British Snails" by John William Horsley
These fresh-water and land-molluscs which possess a lung-sac instead of gills constitute the order Pulmonata.
"Elementary Zoology, Second Edition" by Vernon L. Kellogg