[9] Pflüger's Archiv. f. d. ges. Phys. Bd. xxix, 1882, quoted by Romanes. Mental Evolution, p. 80, 1883. _Op. cit._ p. 80.
[10] Quoted by Romanes, _op. cit._ p. 81.
[11] Descent of Man, vol. ii., p. 132.
[12] Quart. Journ. Sci., July 1868, p. 325.
[13] Studies in the Theory of Descent.
[14] See photographs in Hutchinson's Illustrations of Clinical Surgery.
[15] See [Plate IV].
[16] Desc. Man, vol. ii, p. 133, fig. 52.
[17] Compare his figs. 56 to 58 op. cit.