Errata

XXXIX. *The Lignites and Clays of Bovey Tracey, Devonshire.* By William Pengelly, F.G.S. Communicated by Sir Charles Lyell, F.R.S. XL. *On the Fossil Flora of Bovey Tracey.* By Dr. Oswald Heer, Professor of Botany, and Director of the Botanical Gardens in Zurich. Communicated by Sir C. Lyell XLI. *On the Anatomy and Physiology of the Spongiadæ.*—Part III. *On the Generic Characters, the Specific Characters, and on the Method of Examination.* By J. S. Bowerbank, LL.D., F.R.S., F.L.S. &c. Index Appendix. Errata. Page 163, lines 2, 9, 13 (art. XLVII.), erase the word “non-polar.” —— line 7, *for* because *read* when. —— 588, line 10 from bottom, cancel $p$ at the end of the formula, which should be $$\frac{Ct}{\nu} = \frac{3}{4} AJK \frac{(273 \cdot 7)^2}{t}.$$ —— 755, 7 lines from bottom, *for* Plate A. *read* Plate XXVII. —— 864, 8 lines from bottom of text, *for* fig. 2 *read* fig. 2. —— — 6 lines from bottom of text, *for* fig. 3 *read* fig. 2. Page 869, 13 lines from bottom of text, *for more* *read* less.