Note 213 — Chapter VII
Reading edition
Foss. S. D. p. 178.
[214] From the supposition that the original was an Actinia, or Sea-Anemone. A coloured vertical section of a pebble of this kind is figured in my "Thoughts on a Pebble," Eighth Edition, pl. ii. See coloured figures of Choanites in Pict. Atlas, pl. xlii. fig. 1, 9, and 10; pl. xliv. fig. 8; and pl. xlv. fig. 10.