[64] Bull. Mus. C. Z. Harv. iv. p. 193.
[65] l. c. p. 362.
[66] Animal Life, p. 59.
[67] Zoologist, 1861, p. 7400; Brit. Conch. i. p. 108.
[68] H. Ullyett, Science Gossip, xxii. (1886), p. 214.
[69] Descent of Man, i. p. 325, ed. 1.
[70] Amer. Nat. xv. 1881, p. 976.
[71] W. A. Gain, quoted by H. W. Kew in Naturalist, 1890, p. 307, an article to which I am much indebted.
[72] Ann. Mag. Nat. Hist. (5) xvi. p. 519.
[73] Science Gossip, 1882, pp. 237, 262.