Nominal classification systems have been the subject of analysis since the beginnings of the study of language. Such systems are a prominent feature of many Aboriginal languages from Northern Australia. This volume provides a discussion of recent literature on classification systems, detailed material on some of the Aboriginal languages as well as systems from across the spectrum of semantic and structural variation. The principal Australian languages discussed include: Marrithiyel, Murrinhpatha, Ngan'gityemerri, Mayali and Wardaman. A number of other Australian languages are explored in lesser detail together with the verbal classification systems found in a number of New Guinea languages as a comparison to the nominal classificatory systems of Australian languages.