EXPLANATION OF THE PLATES AND WOOD-CUTS. 



PLATE VL 



Map and contours of ground illustrative of Lieut. Nelson's Memoir on the Geology 



of the Bermudas : p. 103 to 123. 

 Fig. 1. General Map of the group, the outline of the reef having been sketched from 



the usual authorities. 

 Fig. 2. illustrates contours of ground taken at points without any special selection : 



the difference of level is indicated by different intensity of tints : pp. 109 & 117. 



WOOD-CUTS ILLUSTRATIVE OF LIEUT. NELSON'S PAPER. 



Fig. 1. & 2. Sections at the summit of Retreat Hill, St. George's Island, The waved 



lines mark the disposition of the layers of sand: p. 106. 

 Fig. 3. & 4. General sketches of the cliffs along the south side of Bermuda, or the 



Main Island : p. 107. 

 Fig. 5. Section across the east end of Ireland Island : p. 108. 

 Fig. 6. Section at right angles to a. Fig. 5. The difference in the direction of the dip 



indicating the former existence of mantle or saddle-shaped strata: p. 108. 

 Fig. 7. Caverns covered by red earth : p. 108. 

 Fig. 8. Cave once under the North Bastion, Ireland Island : p. 112. 

 Fig. 9. Sections through a supposed fossil palmetto grove. The part3 marked a are 



filled with hard compact stalagmite : p. 115. 

 Fig. 10, c and 6?. Plan and section of the recent palmetto root : p. 115. 

 Fig. 11. Plan of a coral reef forming around a sand-bank: p. 116. 

 Fig. 12. Section of a small isolated coral reef: p. 116. 

 Fig. 13. Plan and section of a serpuline reef near Elbow Bay, south side of Bermuda : 



p. 117. 

 Fig. 14. Section near the Magazine Pond, Ireland Island, illustrative of one of the 



first steps in the formation of caverns : p. 118. 

 Fig. 15. Sand caves : p. 119. 

 Fig. 16. Pinnacles near Tobacco Bay, St. George's Island : p. 120. 



PLATE VII. 



Map and Sections illustrative of Mr. Romley Wright's paper on the Brown Clee Hill 

 p. 125 and 126. 



PLATES VIII. & IX. 



Fossils from the well sunk at Hampstead, and described in Mr. Wetherell's paper ; 

 p. 131 to 136. 



