(Chapter 18) Footnote 40:

Latin pelvis, “basin”: hence the name of the pelvic girdle. Vesalius’ teleologic description is derived from Galen’s account of the pelvis in De usu partium: “All these bones which I have been describing have their inner surfaces concave, hollow, and smooth, some more and some less but all to some extent, so that they produce a single, large, bony vault, covering and protecting all the parts of the animal occupying the cavity within it, both the spermatic vessels and other parts as well.” (4.199.3-9, tr. May 1968 p. 649).