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 of organization of an Australian tribe therefore looks as follows:

Totem and Taboo (1919) 25.png

The twelve totem groups are brought under four subclasses and two main classes. All the divisions are exogamous. The subclass c forms an exogamous unit with e, and the subclass d with f. The success or the tendency of these arrangements is quite obvious; they serve as a further restriction on the marriage choice and on sexual freedom. If there were only these twelve totem groups—assuming the same number of people in each group—every member of a group would have $11/12$ of all the women of the tribe to choose from. The existence of the two phratries reduces this number to $6/12$ or $1/2$; a man of the totem a can only marry a woman from the groups 1 to 6. With the introduction of the two subclasses the selection sinks to $3/12$ or $1/4$; a man of