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Any fresh-water air-breathing mollusk belonging to Planorbis and other allied genera, having shells of a discoidal form.

The most common kinds are air-breathing snails (Pulmonifera) belonging to Limnæa, Physa, Planorbis, and allied genera. The operculated species are pectinibranchs, belonging to Melantho, Valvata, and various other genera. -- Pond spice (Bot.), an American shrub (Tetranthera geniculata) of the Laurel family, with small…

as in Helix, or land snails, Limax, or garden slugs, and many pond snails, as Limnæa and Planorbis.

Any aquatic pulmonate gastropod belonging to Planorbis, Limnæa, and allied genera; a pond snail.