Guide to the systematic distribution of Mollusca in the British museum. Part I. British Museum (Natural History) Dept. of zoology. Gray, John Edward, 1800-1875. text London, Printed by order of the trustees, 1857. eng xii, 230 p. 23 cm. Includes four orders of Gasteropoda. "The concluding part [order V, Pneumobranchiata] is in hand, and it is hoped will shortly appear." cf. Pref. No more published. cf. Brit. mus. (Nat. hist.) Cat. Mollusks -- Catalogs and collections. Gastropoda.