RATIONALIBUS DIVISIS, WRIT DE. The name of a writ which lies properly when two men have lands in several towns or hamlets, so that the one is seised of the land in one town or hamlet, and the other, of the other town or hamlet by himself; and they do not know the bounds of the town or hamlet, nor of their respective lands. This writ lies by one, against the other, and the object of it is to fix the boundaries. F. N. B. 300.