The basis of the mollusc collection of the Zoological Museum Amsterdam (ZMA) originates from the collection of the Royal Zoological Society 'Natura Artis Magistra' [Artis Zoo] founded in 1838. Various persons contributed to the mollusc type collection. Prof. Max Weber, leading the Siboga Expedition in 1899-1900 to the Netherlands East Indies, described many new species. In addition, the curators Woutera Van Benthem Jutting (1919-1964: land molluscs from S.E. Asia), Henny Coomans (1965-1994: marine molluscs from the West Indies), and Robert Moolenbeek (1994-present: marine micro molluscs Indian Ocean and Conidae) were responsible for many new types in the collection. Currently, the type collection hosts 4687 specimens of which 963 holotypes, 132 lectotypes, 5 neotypes and 1126 syntypes and numerous para(lecto)types. [date: 10 February 2010].