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A History of the County of Somerset
… Clevedon, Bristol nautileus (Linn.) carinatus, Mll. Kenn Moor marginatus, Drap. vortex (Linn.) spirorbis, Mll. … Wells by Mr. Harding, Bridgwater by Mr. Corder, Walton Moor near Clevedon by Mr. Mason, and Bath by Dr. Terry Halias … by Mr. Ross at Bathampton (one specimen only), on Walton Moor near Clevedon by Mr. Mason, and at Stoke by Dr. Walter …
A History of the County of Somerset
… to which that vernacular name is given. On parts of our east coast however it would seem to be the predominant form. … several are so impartially distributed north and south, east and west, that they may reasonably be expected to occur …