If Bomabadil is definetly
nota Maia [according to JRRT] how can we say anything definite about Goldberry?
Much more can be said about the spirits before time mentioned above. I need to re-read it all and check sources myself.
But as for Ungoliant, I agree Gwaihir, we only see her in Avathar [the southern shores of the Undying Lands] after Aman has been established. From the paragraph 2 ch. 8 in the Silm it says that
Quote:
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some of the eldar "have said...she may have descended from the darkness that lies about Arda...and that in the begining she was one he corrupted to his service."
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Sounds pretty Maia-like to me.