Abstract
Opening ParagraphIn this paper I isolate for study a particular set of ancestors, the maternal ancestors in patrilineal societies and paternal ancestors in matrilineal societies. I call these the ‘extra-descent group ancestors’, for they are the ancestors of the parent who is residual with reference to the descent group of Ego. Thus among the Tallensi of northern Ghana, since membership of the descent group is traced patrilineally, the mother is the residual parent, and consequently the maternal ancestors are extradescent group ancestors, while the patrilineal ancestors are descent ancestors. Conversely, among the Plateau Tonga of Zambia, where there is a matrilineal system of descent, the father is the residual parent, and therefore the extra-descent group ancestors are the paternal ancestors, while the descent ancestors are matrilineal. It is with the character and actions of the extra-descent group ancestors that I shall be mainly concerned.

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