NO. 6 MIDDLE CAMBRIAN BRANCHIOPODA, ETC. 



PAGE 



Branchinecfa, specimens flattened between glass plates 169 



Branchinecta paliidosa (O. F. Miiller), effect of pressing 168 



Branchiopoda, classification of 154 



Apodidae of, compared with Burgessia bella 179 



Bidentia difiicilis nearer to Merostomata than to 174 



Burgessia in 163 



Cambrian, descendants of 166 



descent of 160-161 



development discussed 163 



foreshadowed by Burgess shale fauna 165 



genera in the Cambrian 157 



of the order Anostraca 165 



relations of, to Leptostraca, Malacostraca, Trilobita, and Meros- 

 tomata 163 



segmentation, table of 158 



subclass 148, 153, 166 



survival of 165 



mentioned : 155 



Branchiopoda and Malacostraca, compared with Waptidse 180 



Branchipus, specimens flattened between glass plates 169 



Branchipus vernalis Verrill, compared with Opabinia regalis 168 



Brock, R. W., Director of Geological Survey, Canada, acknowledgments. . 204 

 brocki, see Emeraldella. 



Burgess, mountain and pass, British Columbia, Canada 177 



Burgess Pass, trail to Summit Lake from 152 



Burgess shale, crustaceans of 149 



Naraoia compacia from 176 



species of ostracod in 157 



Burgess shale fauna, foreshadows living Crustacea 165 



relation to recent crustaceans 164 



Burgess shale fossils, mentioned 193 



Burgess shale member, collections from 148 



of Stephen formation 151 



Burgessia, new genus, discussed 177 



classification of 154 



carapace of 157 



compared with Lepidurus 165 



labrum of 158 



probable ancestor of Polyartemidaj and Apodidae 165 



separated from Apus 162-163 



shield of, mentioned 157 



stratigraphic position and association 153 



Burgessia bella, new species 177, pi. 27, figs. 1-3, pi. 30, figs. 3 and 4 



appendages of 178 



carapace of 177-178 



compared with Apodidae 179 



compared with Apus 162 



compared with Naraoia compacta 176 



eyes of 178 



stratigraphic position and association 152 



