The NBM mollusc collection included about 9,000 catalogued lots of dried and wet-reserved specimens.  Although the collection includes some late 19^th C specimens, most material is post-1950. The collection incorporates the private collections of Jean E. and Sandra L. Brown (marine, worldwide), Don Doell (Conide, uncatalogued), and R. Henderson (marine, Caribbean and Somalia, uncatalogued). Significant recent additions include terrestrial molluscs from NBM Research Associate Robert Forsyth and large holdings of the 10 New Brunswick freshwater mussel species (Margaritiferidae, Unionide), acquired through staff investigation and those of local watershed groups.