490 INDEX 



PAGE 



Sources of sediments, Algonkian formations 5 



sparsa, see Canadia. 



Species, previously referred to Dikelocephaliis 349 



speciosa, see Anomocarella. 



speciosum, see Anomocare. 



speciosus, see Dikcloccphalus and Ptychaspis. 



spinifera, see Molaria. 



spiniger, see Calvinella and Dikelocephaliis. 



spinosa, see Acrotreta and Canadia. 



spinosus, see Zacanthoides. 



Spirodentalium osceola Walcott, listed from locality 78 361 



listed with St. Lawrence fauna 356 



splendens, see Marrella. 



Stalked eyes, Opabinia, Waptia, Yohoia, and Hymenocaris 159 



Steeprock Lake, Ontario, Canada, Huronian fossil-bearing limestones of. 316 



Steiger, George, chemical analysis of slate by 150 



stcinmanni, see Amphoton. 



Stenotheca sp. undt., listed from Eau Claire formation 358 



Stephanocare Monke (:= Damesella Walcott), present and former ge- 

 neric reference 71 



? monkei Walcott, new species described 77 



figured, pi. 14, fig. 7 102 



in synonymy yj 



listed, Cambrian faunas of China 73 



richthofeni Monke (^ Damesella chione Walcott), present and 



former generic reference 71 



? sinensis (Bergeron) (^Damesella sinensis Walcott), present 



and former generic reference 71 



(= Dicellocephahis ? sinensis Bergeron), present and for- 

 mer generic reference 71 



sinensis Monk^ (^ Blackwelderia sinensis (Bergeron)), former 



and present generic reference 72 



sp. Monke, referred to Stephanocare ?^ 'monkei 77 



Stephen formation, British Columbia •...'........ .42-68, 110-144, 148 



comparative stratigraphic >sections 343 



Ogygopsis shale, British Columbia, Middle Cambrian 17-38 



Ogygopsis zone, reference to 42 



summary, stratigraphic section 342 



sterope, see Aluta and Bradoria. 



Stillwater, Minnesota, Upper Cambrian locality 85b near 371 



stoncanus, see Obolns (Westonia). 

 stosei, see Saukia. 



Strabops, representing Merostomata 155 



and Aglaspis, discussed 19 



thacheri, compared with Sidneyia 20 



eurypterid remains reported by Beecher 19 



Straparollns ? (Ophileta ?) primordialis Winchell, listed from Jordan for- 

 mation 355 



Stratigraphic distribution, earliest representatives of the five subclasses 



of Crustacea, table 156 



four subclasses of this paper 155 



