When Servius made his new division, as the thirty curi? could not be shared equally between his four tribes, and as he was unwilling to interfere with them,they became a further division of the inhabitants of Rome, quite independent of the tribes: but in the case of the rural tribes and their members there was no question of cuti? as the tribes had then become a purely civil institution, and, a new system of levying troops having been introduced, the military divisions of Romulus were superfluous. Thus, although every citizen was enrolled in a tribe, there were very many who were not members of a curia.