(Chapter 19) Footnote 37:

Ligurians. Vesalius cites Historia animalium 1.15 in his margin: “Common to the upper and lower trunk are the ribs, eight on each side. (We have received evidence about the alleged seven-ribbed Ligurians.)” 493b15, Loeb tr. by A. L. Peck. The qualification added in Vesalius’ account may be derived from Michael Scot’s 13th century translation from the Arabic. See note 21 above.