616 



MESSRS. GAKDNEE, KEEPDfG, AND MONCKTON ON THE 



brings them to the surface and permits water to percolate through 

 them. It appears perfectly certain that the Upper Bagshots in the 

 London area were once at least as fossiliferous as those of Hamp- 

 shire, and the beds and what can still be recognized of their fauna are 

 such as might have been found in an open sea of considerable depth. 



Pig. 11. — Sketch Map showing the Upper Bagshot Sand, of the 

 Bagshot Area. (Scale 5 inch to 1 mile.) 



gdale 



■ Xypo-Etching.Sc^ 



The numbers refer to localities noticed in the paper. 

 Fossils from the Upper Bagshot Sand. 



(All are from Tunnel Hill, marked 21 on the sketch-map. The * 

 indicates where a species is most abundant.) 





c 



S 



a 



a 



^ 



^ 



i 



K% 



c3 



w 



(§ 



^^ 



U 



1 ® 



S-i 



P| 



% 



? 



a 



w 



^ 



s 



U 



— 



* 

 * 







— 



* 



? 



* 



* 



— 



* 





Ancillaria canalifera . . . 

 Bucciuum canahculatum 



Bulla attenuata 



Bulla elliptica 



Bulla, sp 



Bulla orbicula 



Cancellaria evulsa 



Cassidaria nodosa 



