This paper describes a distinctive system of nominal subclasses observed in Dalabon, a non-Pama-Nyungan, Gunwinyguan language of south-western Arnhem Land, Australia. These subclasses differ from what is usually called noun classes in Australian languages, and no such system has been described for an Australian language so far. While most Gunwinyguan languages use noun class prefixes offering an overt categorization of noun classes, Dalabon has no such prefixes. On the other hand, six semantically coherent nominal subclasses can be delineated based on four inter-related criteria-noun incorporation, boundness, obligatory possession and possessor raising. These subclasses are animate-part nouns (incorporable, strictly bound, obligatorily poss...