MolluscaBase source details
Gyngell, W. (1929). Helix hortensis (Müll.) monstrosities at Scarborough. Journal of Conchology, London. 18(10): 287.
481989
Gyngell, W.
1929
<i>Helix hortensis</i> (Müll.) monstrosities at Scarborough
Journal of Conchology, London
18(10): 287
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Helix hortensis O. F. Müller, 1774 accepted as Cepaea hortensis (O. F. Müller, 1774) (additional source)