This paper reviews the Rissoinidae and Zebinidae collected during the Rumphius Biohistorical Expedition to Ambon, in 1990, with additional material collected by the second author (hls). In all, 30 species belonging to the family Rissoinidae and 12 species belonging to the family Zebinidae are recognised. The wellknown species are listed with a short synonymy and the poorly known species are redescribed in detail and illustrated. The biogeographical relationships of the rissoinid and zebinid fauna from Ambon are briefly discussed.