Nowhere else can a person of division A and totem Grub find a Grub to marry in the opposite division B.But this is possible among the Arunta and Kaitish, because their totems are acquired by pure accident, are not hereditary, and all totems exist, or may exist, in division A and also in division B.
Mr.Frazer argues that the Arunta is the earlier state of affairs.

He supposes that men acquired their totems, at first, by local accident, before they had laid any restrictions on marriage.

Later, they divided their tribe, first into two, then into four, then into eight classes; and every one had to marry out of his class, or set of classes.

All other known tribes introduced these restrictions after totems had been made hereditary.

On passing the restrictive marriage law, they merely drafted people of one set of hereditary totems into one division, all the other totem kins into the other division.