To Professor W. J. Sollas, Sc.D., F.R.S., who undertook to write the chapters on Porifera when the work was first planned, the Author and the Editors are indebted for his kind assistance in reading and criticising this article.
Rarities belonging to the Royal Society preserved at Gresham College, 1686.
Gerarde's Herbal, enlarged and revised by Thomas Johnson, 1636, p. 1587.
Phil. Trans. lv. p. 280.
Histoire Phys. de la Mer, 1725.