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A History of the County of Somerset
… been found in the county, and possibly one or two more may yet be added, such for instance as Vitrea lucida. The … Shirehampton; The Pill, Clevedon stagnalis (Bast.). River mouths on the coast Bithynia tentaculata (Linn.) … plants, some confining themselves to special plants, which may be abundant, rare or altogether absent, according to the …
A History of the County of Somerset
… certainly await discovery, if their existence in Somerset may be inferred from what has been ascertained of their range … Amongst the missing species which are common elsewhere may be mentioned Lithobius melanops, Polyxenus lagurus, … northern part of the county on the southern side of the river Avon, which here constitutes the boundary line between …