[ ] 
XXXIX. The Lignites and Clays of Bovcy Tracey^ Devonshire. By William Pexgelly, 
F.G.S. Communicated hy Sir Charles Lyell, F.B.S. page 1019 
Xli. On the Fossil Floj'a of Bovey Tracey. By Dr. Oswald Heer, Professor of Botany, 
and Director of the Botanical Cardens in Zurich. Communicated by Sir C. 
Lyell 1039 
XLI. On the Anatomy and Physiology of the Spongiadce . — Part III. On the Generic 
Characters, the Specific Characters, and on the Method of Examination. By Z.S. 
Bowrrbantv, IjL.D., F.B.S. , F.L.S. &c 1087 
Index 
Presents 
Appendix. 
1137 
[ 1 ] 
BEEATA. 
Page 163, lines 2, 9, 13 (art. XLVII.), erase the word “non-polar.” 
— — line 7, for because read when. 
— 58S, line 10 from bottom, cancel p at the end of the formula, which should be 
rL!_iAJK 
P 
— 755, 7 lines from bottom, Plate A. read Plate XXVII. 
— - 864, 8 lines from bottom of text, /hr fig. 2 read fig. 3. 
— 6 lines from bottom of text,ybr fig. 3 read fig. 2. 
Page 869, 13 lines from bottom of text,yor more read less. 
