49:5.9

The inhabited spheres of the seven superuniverses are peopled with mortals who simultaneously classify in some one or more categories of each of these seven generalized classes of evolutionary creature life. But even these general classifications make no provision for such beings as midsoniters nor for certain other forms of intelligent life. The inhabited worlds, as they have been presented in these narratives, are peopled with evolutionary mortal creatures, but there are other life forms.