This database of known, living species of slit shells (family Pleurotomariidae) is based primarily on the collections of the National Museum of Natural History, Smithsonian Institution (USNM). The original description, synonomy, and reference to USNM specimens is provided for each species. Most species are represented by at least one photograph. Links to GenBank and video clips from various submarine dives are also on the lifedesk. The classification is based on the WoRMs database, current as of 8/11/2010.