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Weymouth, England (English Channel)
latitude: 50.616669 50 37 N
longitude: -2.433333 2 26 W
Precision of location: Gauged from chart or map
Site Named Here: By name of site (or city, etc.)
| Convoluta convoluta | prior to 1905 | littoral | ||
| Convoluta paradoxa | 1855 or earlier |