Gray, J. E. (1857). <i>Guide to the systematic distribution of Mollusca in the British Museum</i>. Part I. [Gastropoda]. British Museum, London, xii + 230 pp. [9 May; Preface dated 10 Dec. 1856]. , available online athttp://www.biodiversitylibrary.org/item/117528 page(s): 26 [details]
original descriptionGray, J. E. (1857). <i>Guide to the systematic distribution of Mollusca in the British Museum</i>. Part I. [Gastropoda]. British Museum, London, xii + 230 pp. [9 May; Preface dated 10 Dec. 1856]. , available online athttp://www.biodiversitylibrary.org/item/117528 page(s): 26 [details]