[157]

Moseley, Challenger Reports, Zool. xxii. 1887, p. 267.

[158]

C. W. Wilson, Journ. Morph. xv. 1899, p. 667.

[159]

Burckhardt, Ann. Mag. Nat. Hist. (7), vi. 1900, p. 568.

[160]

Ibid. op. cit. p. 558.

[161]

Wiliamson, Phil. Trans. cxxxix. 1849, p. 435; Hertwig, Morph. Jahrb. ii. 1876, p. 328; v. 1879, p. 1; vii. 1882, p. 1; Klaatsch, ib. xvi. 1890, p. 97 et seq., p. 209 et seq.