[477]

Bridge, Journ. Anat. and Phys. xiv. 1879, p. 81; Bles, ib. xxxii. 1898, p. 484; Proc. Roy. Soc. lxii. 1898, p. 232.

[478]

Max Weber, Morph. Jahrb. xii. 1886, p. 336.

[479]

Ewart, Journ. Anat. and Phys. x. 1876, p. 488.

[480]

Burne, Linn. Soc. Journ. Zool. xxvi. 1898, p. 487.

[481]

Semper, Centralblatt f. Med. Wiss. 1875, No. 29; F. M. Balfour, Journ. Anat. and Phys. x. 1875, p. 17; Id. Comparative Embryology, London, 1881, ii. p. 568.