(Chapter 1) Footnote 8:

See Galen, De ossibus ad tirones 2.743-752. The 1555 edition omits the Greek names of this and the other bones so identified in this paragraph, instead identifying the sphenoid as the seventh bone in the head. It also adds at this point the spongelike cribriform bone [lamina cribrosa], calling it the eighth bone of the head os ethmoidale.