Sometimes, but no less exceptionally, it is an ancestor or a group of ancestors which serves as totem directly. In this case, the clan takes its name, not from a thing or a species of real things, but from a purely mythical being. Spencer and Gillen had already mentioned two or three totems of this sort. Among the Warramunga and among the Tjingilli there are clans which bear the name of an ancestor named Thaballa who seems to be gaiety incarnate.[234] Another Warramunga clan bears the name of a huge fabulous serpent named Wollunqua, from which the clan considers itself descended.[235] We owe other similar facts to Strehlow.[236] In any case, it is easy enough to see what probably took place. Under the influence of diverse causes and by the very development of mythological thought, the collective and impersonal totem became effaced before certain mythical personages who advanced to the first rank and became totems themselves. Howsoever interesting these different irregularities may be, they contain nothing which forces us to modify our definition of a totem. They are not, as has sometimes been believed,[237] different varieties of totems which are more or less irreducible into each other or into the normal totem, such as we have defined it. They are merely secondary and sometimes even aberrant forms of a single notion which is much more general, and there is every ground for believing it the more primitive. The manner in which the name is acquired is more important for the organization and recruiting of the clan than for religion; it belongs to the sociology of the family rather than to religious sociology.[238] So we shall confine ourselves to indicating summarily the most essential principles which regulate the matter. In the different tribes, three different systems are in use. In a great number, or it might even be said, in the greater number of the societies, the child takes the totem of its mother, by right of birth: this is what happens among the Dieri and the Urabunna of the centre of Southern Australia; the Wotjobaluk and the Gournditch-Mara of Victoria; the Kamilaroi, the Wiradjuri, the Wonghibon and the Euahlayi of New South Wales; and the Wakelbura, the Pitta-Pitta and the Kurnandaburi of Queensland, to mention only the most important names. In this case, owing to a law of exogamy, the mother is necessarily of a different totem from her husband, and on the other hand, as she lives in his community, the members of a single totem are necessarily dispersed in different localities according to the chances of their marriages. As a result, the totemic group lacks a territorial base.