LIST OF WOODCUTS. 



PAGE 



Spiriferina rostrata, Dav ■* 



Athyris planosulcffta,Da,Y ^ 



Meristella tumida, Hall " 



Kucleospira pisum, Dav " 



Eetzia Salteri, Dav ° 



Atrypa reticularis^ Linn " 



Atrypa marginalis, Dalm ^^ 



Ccelospira concava, Hall •'■" 



Atrypa Barrandi, Dav l-*- 



Glassia obovata, Dav ^^ 



Zygospira modesta. Hall ^^ 



How to delineate upon a cutting plane the trace of a cylindilcal, or any other 



surface, which can he formed out of a folded plane 21 



Sections of folded planes 22 



Map of "Western Cortland 60 



Crystalline Eock Structure (6 figures) Ill 



Ditto ditto ditto (2 figures) 115 



Ditto ditto ditto (1 figure) 117 



Ditto ditto ditto (3 figures) 118 



Vertical Section of a Laccolite in contorted strata 135 



Waldheimia Mawei 1^" 



Spiral Coils of Glassia obovata 149 



Uncites gryphus 1 53 



Geological Sketch Map of British Columbia 160 



Sketch Section across the Cordillera Eegion in the vicinity of the ooth 



Parallel 161 



Crystalline Structure of Eocks — Section 163 



Ditto ditto ditto 164 



Ditto ditto ditto Section 166 



