Volume 17.2 of the Zoological Catalogue of Australia series deals with four marine mollusc groups: Aplacophora, Polyplacophora (chitons), Scaphopoda and Cephalopoda (octopuses, squids, cuttiefish and the chambered nautilus). Each species is cited by name and original references are given to all species known from Australian waters. Information includes synonymy, literature citation, location and status of type material and type locality for each available name. Important references on aspects such as biology are also included.