[351] The term epidermis, as distinct from periostracum, is properly restricted to the outer layer of the skin of the mantle and body generally.
[352] J. Lewis, Proc. Bost. Soc. vi. p. 149.
[353] Journ. of Conch. v. p. 66.
[354] The Dispersal of Shells, pp. 182–195.
[355] E. A. Smith, P. Z. S. 1892, p. 259.
[356] C. T. Musson, Proc. Linn. Soc. N. S. Wales (2), v. p. 883.
[357] Scient. Results Sec. Yarkand Exped. “Mollusca,” pp. 1–16.
[358] Mr. H. W. Kew, The Dispersal of Shells, has brought together a very large series.
[359] The Naturalist in Nicaragua, p. 334 f.
[360] Morelet, Journal de Conch. 1875, p. 194.