Demisemiquaver :: Demisemiquaver (n.) A short note, equal in time to the half of a semiquaver, or the thirty-second part of a whole note..
Hemi-demi-semiquaver :: Hemi-demi-semiquaver (n.) A short note, equal to one fourth of a semiquaver, or the sixty-fourth part of a whole note..
Semiquaver :: Semiquaver (n.) A note of half the duration of the quaver; -- now usually called a sixsteenth note.