[347-A] Camb. Phil. Trans., vol. vi. pl. 8. fig. 2.

[349-A] See Proceedings of Geol. Soc., and the anniversary speech of Dr. Buckland, P. G. S., for 1841.

[349-B] Lyell's Second Visit to the United States, vol. ii. p. 277.

[350-A] Memoir on the Hartz, Palæontographica of Dunker and Von Meyer, part iii.

[352-A] Murchison, Silurian System, p. 198, 199.

[354-A] Silurian System, pl. 7. bis. fig. 1. b.

[358-A] Quart. Geol. Journ., vol. ii. p. 11.; and Memoirs of Geol. Survey, vol. ii. p. 518.

[359-A] Quart. Geol. Journ., vol. iv. p. 300.

[359-B] Ibid., 299.

[359-C] Ibid., 145.