瑜伽師地論略纂 1.123

1.123

化生中，或具、不具六處者，不具，謂無想天無有第六意處，及一切生有、死有。或云：劫初鬼畜未必具根而化生故。

Regarding being endowed or not endowed with the six sense spheres in apparitional birth: "not endowed" refers to the Non-conceptual Heaven having no sixth, mental sense sphere, as well as all birth-states of existence and death-states of existence. Or it is said: because at the beginning of the kalpa ghosts and animals were not necessarily endowed with faculties when apparitionally born.