In Social Stratification in Polynesia, Sahlins (1958) identified three basic forms of social organization found in Polynesian societies – the ramage, the descent line system, and interlocking organization – interpreting each as an adaptation to a specific type of island environment. Sahlins's study was directly inspired by Kirchhoff's (1955) discovery and evolutionary interpretation of an internally stratified type of descent group known as the “conical clan,” which Sahlins, following Firth (1936), called the “ramage.” Anthropologists, although they generally reject Sahlins's ecological interpretation, acknowledge his achievement in revealing the conical clan as the basic structural form of many Polynesian societies (Goodenough 1959; Hogbin 1959). Some archaeologists and linguists now view the conical clan genetically, as a component of Ancestral Polynesian Society (Kirch 1984a; Kirch and Green 1987; Bellwood 1978; Pawley 1982). Given the ethnographic and theoretical importance of the conical clan, it is surprising to discover that this structure has never been clearly defined. Kirchhoff characterized the conical clan only in general terms, and although Sahlins was more specific, defining it in terms of a rule of succession, his definition is imprecise and not applicable to all societies in Oceania or elsewhere in the world.