viii Lid of Woodcuts. 



PAGE 



Crystalline Structure of Eocks — Section 169 



Ground Plan of Twt Hill Quarry 194 



Section in Twt Hill Quarry 195 



Section in Quarry 197 



Melanerpeton pusilhtm, Fritsch , 273 



Dolichosoma longissimum, Fritsch 276 



Upper View of Vertebra of Ophiderpeton granulosiim, Fritsch 278 



Section of Glacial Boulders in Secondary Deposits 287 



Merista Serculea, Suess 290 



Dayia navicula, Dav 291 



Wing oi Srodia priscotincta, Scudder 293 



Section in Central Anglesey 351 



Diagram-section of Ballybetagh Bog 356 



Vertical section of a part of the Trias near Chester 397 



Generalized Section across Lowest Beds of Cambrian 440 



Falceocaris typus, Meek and Worthen 533 



