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W. K. Parker, Phil. Trans. 174, Pt. ii. 1883, p. 411; Huxley, Journ. Anat. and Phys. x. 1876, p. 412; Howes, Trans. Biol. Soc. Liverpool, vi. 1891, p. 122.

[193]

Huxley, op. cit. p. 421.

[194]

W. K. Parker, Phil. Trans. 174, 1883, pp. 376-405; Ayers and Jackson, Journ. Morph. xvii. 1901, p. 193.

[195]

Huxley, P.Z.S. 1876, p. 40, et seq.

[196]

Dollo, Bull. Soc. Belge Géol. etc. ix. 1895, p. 110.