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- Water snail by Webster'sThe Archimedean screw.Any aquatic pulmonate gastropod belonging to Planorbis, Limnaea, and allied genera; a pond snail.
- Endemics by Great Soviet Encyclopedia... m above sea level. The snail Limnaea convoluta. Occurs only in one small lake in Ireland. Among plants, the Sequoiadendron are found only on the slopes of the Sierra Nevada in California (USA); Pinus eldarica. Occupies an area of 25–50 sq km on the northern and northeastern slopes of Mount Eyliar-Bug in Soviet Georgia.Areas that are isolated geographically or ...