CONTENTS 15 



I'AGE 



Section at 21st Bridge 168 



Section at Dawson IfiS 



Section at Riverside Station, West Virginia 170 



Section at Cedar Cliff, West Virginia 171 



Section at Devil's Backbone 172 



Sections at Corriganville 174 



Section at Warren Point, Pennsylvania 170 



Section at Ernstville 178 



Section at Cherry Run, West Virginia 170 



SECTIONS OF ORISKANY FORMATION 180 



Section at Monster Rock ISO 



Section at 21st Bridge 181 



Section at Devil's Backbone 182 



Sections near Ridgely, West Virginia 183 



Section on Williams Road, east of Cumberland 185 



Section at North Branch 1 8(5 



Section near Colliers Run 180 



Section at Tonoloway 187 



Section at Hancock 188 



Section at Warren Point, Pennsylvania 189 



SYSTEMATIC PALEONTOLOGY, LOWER DEVONIAN 191 



Coelenterata. C. K. Swartz 195 



Echinodermata 227 



Cystoidea. Charles Schuchert 227 



Crinoidea. D. W. Ohern 249 



Vermes. D. W^. Ghem 2M 



Molluscoidea 259 



Bryozoa. E. O. Ulrich and R. S. Bassler 259 



Brachiopoda. Charles Schuchert and T. P. Maynard 290 



Mollusca 450 



Pelecypoda. D. W. Ohern and T. P. Maynard 450 



Gastropoda. D. W. Ohern and T. P. Maynard 405 



Cephalopoda. D. W. Ohern and T. P. Maynard 487 



Arthropoda 489 



TriloMta. D. W. Ohern and T. P. Maynard 489 



Ostracoda. E. O. Ulrich and R. S. Bassler 513 



GENERAL INDEX 543 



PALEONTOLOGICAL INDEX 549 



