SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



PAGE 



Anostraca, foreshadowed by Burgess shale fauna 165 



in Cambrian time 165 



no true shell among 157 



recent species of, compared with Opabinia 169 



telson 157 



Antennae, Branchiopoda and Malacostraca 159 



Antennules, Branchiopoda and Malacostraca 159 



Apodidae, Apus and other genera of 162 



compared with Burgessia bella 179, 180 



preservation of 166 



remarkable adaptation of 165 



theoretical ancestral stock correlated with 163 



Appendages, described and discussed 158-160 



of Neolenus and Ptychoparia 190 



Apus, Bernard's study of 162 



compared with Marrella splendens 192 



parapodia of 162 



posterior segments of 159 



separated from Burgessia 162-163 



mentioned 191 



Asaphidae, mentioned 196 



Asaphiis platycephalus, mentioned 190 



Ashcaia pedunctilata, stratigraphic position and association 153 



Asterocheridse, hepatic caeca of 160 



Banff ia grandis, stratigraphic position and association 153 



Bather, F. A., correction referring to 148 



Bathyuriscus rotundatus (Rominger), associated with Mollisonia sym- 

 metrica 197 



becki, see Triarthrus. 



Beecher, Order Hypoparia 195 



bellu, see Burgessia. 



Beltiiia, link between Merostomata and Ziphosuridae 165 



occurrence in pre-Cambrian 162 



representing Merostomata I55 



Bernard, " The Apodidae " 166 



" The Systematic Position of the Trilobites " quoted 190-191 



study of Apus 162 



Bident, mountain peak, Alberta, Canada I74 



Bidentia, new genus, discussed I73 



classification of ^54 



no living representatives 165 



Bidentia difficilis, new species i74» pl- 30, fig. I 



appendages 174 



compared with Emeraldella brocki I74 



compared with Waptia fieldensis 174 



stratigraphic position and association i53 



Bohcmilla stupenda Barrande, thorax of Mollisonia, recalls 196 



