556 INDEX 



Agnostus — Continued. page 



sp. undt 473 



trails 175 



Agraulos char ops Walcott, described • 72 



figured, pi. 13, figs. 2, 2a 114 



Agraulos, compared 32 



stator Walcott 21, 28 



figured, pi. 6, fig. 6 56 



( f) unca Walcott y^ 



figured, pi. 13, figs. 1, la 114 



Ahnfeldtia concinna J. Agardh 223 



plicata Fries 223 



Alberta, Canada 470 



Albert ella bosworthi 'Walcott 38 



figured, pi. 7, figs. 2, 2a-b, 3, ^a-d 58 



Albertella fauna 10, 11, 22, 61 



British Columbia and Montana 9 



helena Walcott 39 



figured, pi. 7, figs. 4, 5, 5a 58 



levis Walcott, described 39 



figured, pi. 7, figs. 1, \a 58 



zone, f aunal characteristics 19 



Ptarmigan formation 4 



Algae, calcareous 225 



comparison of recent and early 222 



habitat 219 



manner of preservation 220 



mode of growth 219 



Alimentary canal 425 



Allan, Dr. John A 463 



Amphion ?? sp. undt 473 



Anabaena variabilis Kiitzing 223 



Anal plate 415 



Anaspidacea 166, 169, 170, 173 



relation to Neolenus 170 



Anaspides, compared 130, 170, 171, 207 



tasmanice G. M. Thomson 393 



figured, pi. 35, figs. 1, 2 207 



text fig. 1 171 



Anaspids, compared 151 



Annelids, food for trilobites 174 



Anomocare sp. undt. (5411) 475 



Anomocarella lucius Walcott 475 



macar Walcott 475 



sp. undt 475 



Apatokephalus 458, 467 



broggeri Walcott 474 



Unalis (Walcott) 467 



fronto Walcott 474 



Appendages, trilobite, summarized 115, 177 



