Their ancestor caught a fine fish of the sort called _appei_, which turned into a beautiful woman and became his wife. But she told him that in future neither they nor their descendants might eat the _appei_ fish or else they would at once return to the sea. The family, duly observing the prohibition, increased and multiplied till they occupied the whole country, which was named after them Appeim or Appam.(370) (M103) We may surmise that stories of this sort, wherever found, had a similar origin; in other words, that they reflect and are intended to explain a real belief in the kinship of certain families with certain species of animals. Hence if the name totemism may be used to include all such beliefs and the practices based on them, the origin of this type of story may be said to be totemic.(371) Now, wherever the totemic clans have become exogamous, that is, wherever a man is always obliged to marry a woman of a totem different from his own, it is obvious that husband and wife will always have to observe different totemic taboos, and that a want of respect shewn by one of them for the sacred animal or plant of the other would tend to domestic jars, which might often lead to the permanent separation of the spouses, the offended wife or husband returning to her or his native clan of the fish-people, the bird-people, or what not. That, I take it, was the origin of the sad story of the man or woman happily mated with a transformed animal and then parted for ever. Such tales, if I am right, were not wholly fictitious. Totemism may have broken many loving hearts. But when that ancient system of society had fallen into disuse, and the ideas on which it was based had ceased to be understood, the quaint stories of mixed marriages to which it had given birth would not be at once forgotten. They would continue to be told, no longer indeed as myths explanatory of custom, but merely as fairy tales for the amusement of the listeners. The barbarous features of the old legends, which now appeared too monstrously incredible even for story-tellers, would be gradually discarded and replaced by others which fitted in better with the changed beliefs of the time. Thus in particular the animal husband or animal wife of the story might drop the character of a beast to assume that of a fairy. This is the stage of decay exhibited by the two most famous tales of the class in question, the Greek fable of Cupid and Psyche and the Indian story of King Pururavas and the nymph Urvasi, though in the latter we can still detect hints that the fairy wife was once a bird-woman.(372)