Oh, struggling here. I am missing the two bottom left, cant see the theme and 20a is driving me nuts as I just cant understand how crania fits the rules. Maybe someone can tell me which one of these does NOT have the extra word - 7a,10a, 16a, 26a, 34a, 1d, 8d, 21d, 31d, 36d.....not that I understand 36d.........
Thanks