The present catalogue of the Doliidae has been composed in the same way as my former catalogues. I have entered in it, not only the Doliumspecies present in the collections of the Rijksmuseum van Natuurlijke Historie, but also all the other species that I found mentioned in literature of which we have no material. In Lamarck's time (1822) only 7 Doliums were known, while Reeve in 1849 described 15, which number has since grown to approximately 54 species or varieties. Of all these species I give the principal synonyms and after those of which we possess material, follows a list of the specimens, stating 1) the letter under which it is entered and in the case of material on spirit the number of the bottle, 2) the number of specimens, 3) the locality; if this is wanting there is a point of interrogation, 4) the collector; when the collector's name is unknown I have placed a point of interrogation instead. Genus Dolium Lamarck, 1801 I. Subgenus Eudolium Dall, 1889 D. aulacodes (Tomlin) Eudolium aulacodes Tomlin, Ann S. African Mus., vol. 25, p. 83, fig. 4 a; 1927. — Ann. Natal. Mus., vol. 6, p. 432; 1931. D. crosseanum Monterosato Dolium Crosseanum Monterosato, Journ. de Conch., vol. 17, p. 228, pl. 12, fig. 1; 1869. Dolium Bairdii Verrill, Amer. Journ. Sci. (3), vol. 22, p. 296; 1881. — Trans. Connecticut Acad, vol. 5, p. 515, & vol. 6, p. 253, pl. 29, figs. 2a, 2b; 1884 (fide Dall). Eudolium Crosseanum, Dall, Reports "Blake", Bull. Mus. Comp. Zool. Cambridge, vol. 18, p. 232, pl. 15, fig. 5; 1889.