LIST OF PLATES. 



PLATE FACING PAGE 



I. Dr. Charles Doolittle Walcott 1 



II. Palaeolithic Flake Implements ...... 49 



III. Pores and Channel-Systems in Megacystis . . . .115 



IV. Lower Cambrian Hyolithidae, etc., from Hartshill . . .157 



V. Slabs of Clay Ironstone from the Highest Coal - measures, 



Claxheugh, Co. Durham . . . . . . .211 



VI. Adoral Surfaces of Megacystis ...... 262 



VII. Section across the Northern and Southern Oil- and Gas-fields of 



Pennsylvania ......... 290 



VIII. Neolenus serratus (Rominger), Burgess Shale, C. D. Walcott . . 359 



IX. Fossil Myriopod from Rochdale, Lancashire . . . .411 



X. John Hopkinson . . . . . . . . .431 



XL Cryptopliyllum Hibernicum, gen. et sp. nov. .... 441 



XII. Shell-Limestone Conglomerate at Blackhall Rocks and Jean 



Jiveson's Rock . . . . . . . . . 498 



XIII. Rock and Spindle Shore Stack East from St. Andrews. Con- 

 centric arrangement of Ash Layers, Rock and Spindle . . . 506 



XIV. Bunaia Woodicardi, gen. et sp. nov., J. M. Clarke .... 532 



XV. Arcluvocryptolaria skeatsi, Chapman, etc 550 



