INDEX 447 



PAGE 



crosbyi, see Callavia. 



Crow Nest Pass, possible pre-Cambrian near 430 



Crura, defined I55 



Cruralium, defined 156 



Cruziana, stratigraphic position and association 184, 186, 187, 211, 216 



the trail of a mud burrowing trilobite 242 



Curtice, Cooper, acknowledgments 235 



Curticia, classification of 142, I43 



evolution of pi. 11 (pp. 140-141) 



Curticiidse, classification, of 142 



defined 143 



diagram showing line of descent 140 



distribution in Cambrian strata 140 



curvata, see Acrotreta. 



Cyrtolites, stratigraphic position and association 193 



Dale, T. Nelson, bibliographic references 372, 373 



on the Greenwich formation 268 



Dall, W. H., bibliographic reference 161 



Dalmanella, see Orthis (Dalmanella). 



Dalmanella multisecta (Meek), thin section of 164, pi. 12, fig. 5 



parva (de Verneuil), thin section of 164, pi. 12, fig. 6 



subequata (Conrad), thin section figured 151 



Darton, N. H., species named after 67 



dartoni, see Obolus (PVestonia). 



Davidson, T., bibliographic reference 161 



Davidsonella Munier-Chalmar, in synonymy 72 



Waagen, in synonymy 72 



mentioned .' . . . 74 



Davidsonella linguloides Waagen, mentioned 74 



Dawson, George M., mentioned 4, 317 



dawsoni, see Dorypygc (Kootenia). 



Dearborn, Gen. Henry, mentioned 80 



Dearborn River section, Montana, correlation. 171 



described 20Q-203 



resume of 202-203 



Dearbornia, new genus, mentioned 78 



classification of 142, 146 



compared with Discinopsis 80 



Obolus ' 79 



Schizambon 80 



Siphonotreta 80 



compared with Trematobolus 79, 80 



derivation of generic name So 



evolution of pi. 11 (pp. 140- 141) 



nature of shell substance 150 



Dearbornia clarki, new species 78, pi. 8, fig. 7 



compared with Rustella edsoni 79 



Trematobolus excelsis 80 



