[Excerpt from Introduction]. Few groups of mollusca have presented more difficulties to local conchologists than the Triphoridae. Their small size, close resemblance to each other, and the difficulty of obtaining good and adequate material have led largely to their neglect. Yet few groups are more fascinating and worthy of a close examination. Fortunately the late Charles Hedley (1902) revised the local species, and laid a solid foundation on which future workers could build. In his excellent paper not the least service he rendered was to collate and clear up anomalies in the earlier literature, and to illustrate and expand the inadequate descriptions of previously named species. He described several new species, and in all listed fifteen species from the coast of New South Wales. Since Hedley's paper no further work has been published in New South Wales, though Hedley himself described and reviewed some Queensland and Pacific Island species. May added to the Tasmanian list and Verco did work in South Australia, while B.O. Cotton and F.K. Godfrey proposed a comprehensive classification for the southern Australian species. In New Zealand Sutor, Finlay and Powell also did work on the Neozelandic forms. Etc.