NO. 6 MIDDLE CAMBRIAN BRANCHIOPODA, ETC. 



INDEX 



Note. — The first reference to each of the species described gives the page 

 upon which the description begins and the figure references. References to 

 the description of certain parts or features of a species are as a rule only given 

 in the index if the description occurs outside of the detailed description of the 

 species. For instance : the description of the pygidium of a certain species 

 will be found in the description of that species and there will be no specific 

 reference in the index to the pygidium unless it is described or discussed at 

 some other point in the paper. 



The references in heavy-faced type refer to the pages upon which the species 

 are described. 



PAGE 



Acidaspis, compared with Marrella (footnote) 162 



Aglaspidse Clarke 200 



classification of IS5 



Emeraldella referred to 203 



possible relation of trilobite to 163 



Aglaspina, new order, described 199 



classification of IS5 



derived from Trilobita 163 



foreshadowed by Burgess shale fauna 165 



relation to Limulava 164 



Aglaspis, representing Merostomata I55 



Agnostus, compared with MolUsonia 196 



mentioned 149, 151 



alata, see Odaraia. 



Algonkian, genera that occur in i55 



Alimentary canal, species preserving, 160 



Amiella, characterized 158 



representing Merostomata I55 



mentioned 148 



Amiskwia sagittiformis, stratigraphic position and association 152 



Ampullaria, ancestors of 166 



Analysis, chemical, of slate 150 



Anomalocaris, abdominal segments of, i59 



Whiteaves 1 54. 180 



Anomalocaris canadensis Whiteaves, associated with MolUsonia sym- 

 metrica 197 



compared with Anomalocaris gigantea 180 



Anomalocaris gigantea, new species 180, pi. 34, fig. 3 



compared with Anomalocaris canadensis Whiteaves 180 



stratigraphic position and association I53 



Anostraca Caiman 166 



classification of 1 54 







