What are the conditions, finally, which obtain in form III--limited exogamy with _indirect_ maternal or paternal descent? It is at once obvious that marriage between brother and sister is here also excluded. Furthermore, another union is prohibited which was permitted in form II. For son and daughter, in the case of maternal descent, no longer belong to the totem group of the mother, _p_, but pass over into another group, say _q_. Not only, therefore, is a son prevented from marrying his mother because they both belong to the same clan, but a father is forbidden to marry his daughter because he may take only a woman of group _p_, to which his wife belongs. No less true is this of the son, who now likewise belongs to group _q_, and may therefore no longer marry a female relative of his father's, since the group _q_ into which he has entered has exogamous connections with another totem group of the paternal clan, say with _m_. With this change a step to a _stricter exogamy_ is again taken; the earlier restrictions on marriage remain, and the possibilities of marriage between relations are further reduced by changing the totem of the children. Cousins may not marry each other. Thus, the limits of exogamy are here narrower than those, for example, which obtain in Germany. It is evident that such limitations might become a galling constraint, particularly where there is a scarcity of women, as is the case, for the most part, in Australia. This has led some of the Australian tribes to the remarkable expedient of declaring that a man is not to be regarded as the son of his father, but, in the case of maternal descent, as the son of his paternal grandfather--a step which practically amounts to transferring him into the totem of his father and allowing him to enter into marriage with his mother's relatives. This circumvention, reminding one of the well-known fictions of Roman law, may have its justification in the eyes of the Australians in the fact that they draw practically no distinction between the various generations of ancestors.