PROCESS-BLOCKS AND OTHER ILLUSTRATIVE FIGURES. XV 



Page 

 Fig. a. Diagram illustrating the faunal sequences in the Domerian- 



Hwiccian 265 



B. Diagram illustrating the faunal sequences in the Raasayan, 



Deiran, and Mercian 272 



Figs. 1-7. Suture-lines of Oxynotoids and a Z^eroceras 294 



8-21. Suture-lines (skeleton) and radial lines of Oxynotoids 295 



Map of Nottinghamshire illustrating the occurrence of the 



Bunter Pebble-Beds 332 



Dates of Issue of the duarterly Journal for 1917. 



No. 289 -April 6tb, 1918. 

 No. 290— August 20th, 1918. 

 No. 291— November 30th, 1918. 

 No. 292— December 31st, 1918. 



Errata and Omissa. 



Page 16, third line from the top, after the word 'felspar,' the following 

 sentence has been omitted: ' The laths of the ground-mass appear 

 to be unaltered.' 

 Page 53, line 25 from top, /or ' PI. IV, fig. 13 ' reaxl ' PI. IV, fig. 11.' 

 Page 104, in the first column of table, for ' D3 ' (above the words Dlhiino- 

 phyllum 9) read ' D^^.' 



