1850-1863 Four parts in one. 415 p., 45 lithographed plates, 4to, modern cloth with gilt lettering on spine. Palaeontographical Society.The most important work on British Cretaceous molluscs, with the descriptions and illustrations of many new and little known species, and some new genera. Published over a long period of time and rarely offered complete. The supplementary monograph is by Lycett alone. This is the copy of the British palaeontologist and malacologist Leonard Frank Spath (1882-1957), who is best known for his work on ammonites. Inscribed, in pencil, by Spath on the first title page; some pencil notes, most probably also by Spath, on the front flyleaf verso and on a few plates, one plate with a small, marginal stamp, some light spotting, as usual, but mainly to a few explanatory leaves. A small printed paper with the title and sales price mounted on the first title. In all a very good, complete and well bound set.