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What is "planorbis"

The Collaborative International Dictionary
Planorbis

Planorbis \Pla*nor"bis\, n. [NL., fr. L. planus flat + orbis a circle.] (Zo["o]l.) Any fresh-water air-breathing mollusk belonging to Planorbis and other allied genera, having shells of a discoidal form.

Wiktionary
planorbis

n. (context zoology English) Any of the freshwater air-breathing mollusks belonging to (taxlink Planorbis genus) and allied genus, having shells of a discoidal form.

Wikipedia
Planorbis

Planorbis is a genus of air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails, or planorbids. All species in this genus have sinistral or left-coiling shells.

Usage examples of "planorbis".

In the stagnant waters of our grassy ditches, the flat shells, the humble Planorbes, sometimes no bigger than a duckweed, vie with the Ammonite and the Nautilus in matters of higher geometry.