INDEX 491 



PAGE 



Stratigraphic position, Potsdam-Hoyt fauna 254 



of the Dikelocephalinse 353 



Stratigraphic range, genera of DikelocephaHnse. '. 358 



Stratigraphic sections, comparative, Robson and Bosworth sections 343 



Robson Peak to Moose Pass 336 



striata, see Ptychoparia. 



Stromatopora, compared with Cryptozoon 257, 258 



Structural features, discussed 157 



stupcnda, see BohemiUa. . 



siibquadratus, see Conocephalites and Anomocare. 

 stibrtigosa, see Anomocarclla and Ptychoparia (Liostractis) . 

 siilcatiis, see Discinopsis. 



Summit Lake, trail from Burgess Pass to 152 



superba, see Coosia. 

 siiperlata, see Lcanchoilia. 

 sweefi, see Holopca. 



Swift Current Creek, Montana, collection of Bcltina from 21 



symmetrica, see Mollisonia. 



Synaptidse, family named and described 53 



represented by Mackenzia costalis 45 



Syiiaptula Jiydriformis (Lesseur), text fig. 6 •. 55 



compared with Mackensia costalis 54, 55 



Synonymic references, species previously referred to Dikclocephalus 349 



Syntrophia barabucnsis (A. Winchell), listed from Franconia formation.. 357 



listed from Jordan formation 355 



from locality 78 .- 361 



with St. Lawrence fauna 356 



niiiidiiia Walcott, listed from locality 201a 359 



listed in stratigraphic section 336 



oricntalis Walcott (=Htienella orientalis (Walcott)), former and 



present generic reference 72 



primordialis argia Walcott, listed from Franconia formation 357 



listed with St. Lawrence fauna 356 



from Franconia formation 357 



Synziphosura of Packard, merostomes referred to 19 



Table, cephalic, thoracic, and abdominal segments 158 



stratigraphic distribution of five subclasses of Crustacea 156 



theoretical evolution of Cambrian Crustacea 164 



theoretical lines of descent of Cambrian Crustacea l6l 



Taff. J. A., cited on name " Saratoga " 256, 306 



Tah formation, comparative stratigraphic sections 343 



in stratigraphic section 339 



new formation name 335 



summary, stratigraphic section 341 



Tah (moose) Mountain, new name 334 



Tah Peak, Robson Peak district, locality described 329 



illustrated, text fig. 11 330 



Tatay Cliffs, Robson Peak district, locality described 329 



illustrated, pi. 57, fig. i 338-339 



