He suggests using beasts that stand for letters of the alphabet, andthen assigning images to various parts of each animal—“in the Head, the Bellie, in the Taile, in theformer parte of the legges, & also in the hinder part.”
I've not often seen (yet?) suggestions of using bestiaries as mnemonic techniques, but here's one in Charles Butler's Oratoriae Libri Duo.
What other sources used them this way before or after?
To be clear I'm aware of their use for such, but just haven't read much about them in this period for this particular purpose in these settings.