4l6 INDEX 



Algonkian — Continued. page 



Robson district, stratigraphic section 341 



rocks, deposited in fresh- or brackish-water seas 3 



formations of North America 4 



origin of later 6 



seas, epicontinental, illustrated, text fig. i 10 



sedimentary rocks of Atlantic Coast region, terrigenous origin of . . 3 



time, extent of withdrawal of seas 12 



theoretical profile 10 



Alimentary canal, species preserving 160 



Allan, John A., cited in reference to " Cambro-Ordovician boundary " 



( footnote) 229 



detailed survey by 230 



exploration mentioned 220 



allani, see Lingidella. 

 alternans, see Protichnites. 



Altyn limestone, collection of Beltina from 21 



Montana, Algonkian locality I4y ' 40 



Aluta bergeroni (Walcott) (=z Bradoria bergcroni Walcott), present and 



former generic reference 70 



enyo (Walcott) (=Bradoria enyo Walcott), present and former 



generic reference 70 



eris (Walcott) (^= Bradoria eris Walcott), present and former 



generic reference 70 



fragilis (Walcott) (z=z Bradoria fragilis Walcott), present and for- 

 mer generic reference 70 



sterope (Walcott) {^^Bradoria stcrope Walcott), present and 



former reference 70 



zvoodi (Walcott ) (=^ Bradoria woodi Walcott), present and former 



generic reference 70 



americana, see Arethusina. 

 americanus, see Olenopsis. 



Ami, Henry M., generic name given in honor of 27 



Amiella Walcott, new genus described 27 



characterized 158 



compared with Sidneyia, Pterygotus, and Euryptcnis 27 



discussed 19 



genotype, Amiella ornata 27 



representing Merostomata 155 



mentioned 148 



ornata Walcott, new species described 27 



figured, pi. 5, fig. 4 36 



associated with Sidneyia inexpectans 27 



compared with Pterygotus bilobus Salter var. inornatus 



Woodward and Euryptcrns 28 



genotype of Amiella 27 



Amiskwi, generic name derived from , 112 



Amiskzuia Walcott, new genus described 112 



compared with Sagitta 112 



genotype, Amiskzvia sagittiformis 1 12 



