[28-A] See Synoptic Table in Blainville's Malacologie.

[29-A] Gray, Phil. Trans., 1835, p. 302.

[31-A] For figures of recent species, see below, [p. 183.], and figs. of fossils, see [p. 228.]

[32-A] See Index of Principles, "Fossilization."

[33-A] See Principles, Index, "Lym-Fiord."

[33-B] See below, Chap. XVIII., on the Wealden.

[34-A] See Principles, Index, "Calcareous Springs," &c.

[34-B] Ibid. "Travertin," "Coral Reefs," &c.

[35-A] Report Brit. Ass. 1843, p. 178.

[36-A] Dr. MacCulloch, Syst. of Geol. vol. i. p. 123.