xiv process-blocks and other illustrative figures. 



Page 

 Fig. 5. Form of the anterior margin of the valves of Spiriferina 



and associated genera 21 1 



1. Diagrammatic section near the northern end of the 



Grays Chalk-Quarry Company's pit 239 



Figs. 2-10. Kentish forms of Eolithic chipping 240 



11-15. Kentish and sub-Crag forms of chipping 242 



16-19. Carinate sub-Crag forms of chipping 244 



20-30. Sub-Crag forms, and exceptional resemblances to human 



flaking 246 



Fig. 1. Horizontal sections illustrating the geological sequence 



and structure in the Arthog-Dolgelley district 258 



2. Diagrammatic section illustrating the original relation- 



ship existing between the Bryn Brith Eeds, the Pont 



Kings Slates, and the Lower Acid Volcanic Series 277 



3. Intrusion-breccia, Pared-y-Cefn Hir 287 



4. Diagrammatic section through the minor intrusions of 



the Arthog-Dolgelley area ... 289 



5. Sections of felspar-twins, Crogenen granophyre 292 



6. Sections of allanite, Crogenen granophyre 293 



7. Geological sketch-map of the Arthog-Dolgelley district . 310 



1. Oholella atlantica, var. condei/ensis nov 343 



2. Oholella atlantica, var. transversa nov. 344 



3. Acrothi/ra comleyensis, sp. no v 349 



4. Outline-sketches of five forms of ventral valves of the 



genus Acrotlnjra 352 



1. Ma]) of the Scandinavian Peninsula, showing the main 



zone of Caledonian deformation 388 



2. Geological sketch-map of Fimnarken (Northern Norway) 392 



3. Diagrammatic sections in the north-western part of the 



Varanger Peninsula 394 



4. Diagrammatic sections illustrating the geological struc- 



ture of the Al ten district 396 



5. Diagrammatic sections illustrating the structure of the 



southern part of the Sparagmite area 400 



