(Chapter 28) Footnote 9:

Latin emundatae pisae. The classical form of the noun is pisum. The 1555 edition, considerably rewritten, says: “so that it more or less equals half the size of a rather large pea cleaned of its skin,” adeo ut dimidiam maiusculae pisae iam cortice emundatae molem quodammodo aequet. The figure legend for M in the 15th table of muscles says about these ossicles “they are compared by the Arabs to the shape of half a chickpea.”