If in the absence of an own cross-cousin, a more remote cousin comes to be regularly substituted, we should have a whole class of possible mates, of whom the nearest cross-cousin would be only _primus inter pares_. It must be understood that while special marriage regulations, like exogamy, tend to be mirrored in nomenclature, there is no absolute necessity for this occurrence. As the New Mexican Tewa have exogamous groups without the Dakota principle, so the Miwok of California have the cross-cousin marriage with little or no indication of it in terminology.[67] One factor that must always be considered in this connection is the time element. A recently acquired custom may not yet have developed an appropriate nomenclature, while, as Morgan supposed, the nomenclature may survive after the custom has become obsolete. That the frequency of marriage according to a certain rule, and the coexistence of other rules, possibly antagonistic in their effects, must have an influence, is obvious. As regards the latter point, Mr. Gifford shows that while marriage with the cross-cousin is not suggested in Miwok nomenclature, marriage with the wife’s brother’s daughter is reflected by twelve terms. Among the Thonga of South Africa several interesting forms of preferential matrimonial union occur. As among the Miwok, marriage with the wife’s, younger sisters and wife’s brother’s daughter is considered peculiarly appropriate, and these affinities are subsumed under a common caption. Levirate extends only to the elder brother’s, not to the younger brother’s, wife, and quite consistently these affinities are distinguished by distinct words. A man may inherit his maternal uncle’s wife and therefore classes her with the wife. On the other hand, logic does not hold sway undisputedly. A man calls cross-cousins by the same term as parallel cousins and brothers, yet it is possible for a man to inherit his parallel cousin’s, but not his cross-cousin’s (father’s sister’s son’s), wife. The explanation given by Junod seems quite satisfactory from a comparative point of view. My cross-cousin cannot belong to my gens, my parallel cousin must belong to it.[68] Since the Thonga usually distinguish marriage potentialities with considerable nicety, we may reasonably infer that the present terminology for cousins is a recent innovation, which conclusion once more indicates the relatively late development of Hawaiian features.