438 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



PAGE 



Archseocyathinae limestone, South Australia, fossils in no 



Archceocyathus, mentioned 300. 3iS> 323 



stratigraphic position and association 187, 188, 189 



Area, defined IS4 



ar gen tea, see Isoxys. 

 argentus, see Olencllus. 

 arguta, see Lingulella. 



Arionellus, mentioned 290 



Arizona, fresh-water origin of Algonkian sediments in 252 



armatus, see Olenelloides and Olencllus {Olenelloides). 

 artemis, see Acrothele. 



Articulate Brachiopoda, defined IS4 



Asaphiscus minor, stratigraphic position and association 178 



zuheeleri, stratigraphic position and association 181 



sp. undt., stratigraphic position and association 199 



asaphoides, see Ebeneseria, Elliptocephala, Mesonacis (Olenellus), Ole- 

 ncllus, Olenellus (Georgiellus), Olenellus (Mesonacis), Olenellus (Ole- 

 nus), Olenus, and Paradoxides. 



Asaphus, eye of compared with that of Limulus 239 



Asaphns ? , stratigraphic position and association 192 



attenuata, see Acrotreta. 



Atremata, classification of 142 



defined ;, 142, 154 



evolution of genera of pi. 11 (pp. 140-141) 



augusta, see Crepicephalus.. 



Baker Lake, pre-Cambrian thrust over Siluro-Devonian near 429 



Baraboo, Wisconsin, fossils near loi 



barabucnsis, see Syntrophia. 



Barrande, J., bibliographic references HI, 372 



species named after ■ 78 



barrandei, see Botsfordia. 



Barrandia Hall, in synonymy 261, 311 



McCoy, in synonymy 311 



thompsoni Hall, in synonymy 336, 337 



vermontana Hall, in synonymy 265, 305 



Barrel Spring section, described 188-189 



fossils from 296, 315, 320, 323, 330 



Bassler, R. S., thin sections prepared by 150 



Bath Creek, pre-Cambrian rocks on 430 



Bathyuriscus, compared with Oryctocara 23, 25 



hozvelli, mentioned 25, 30, ZZ, 35. 38 



stratigraphic position and association 198 



occidentalis, compared with Bathyuriscus rotundatus 41 



stratigraphic position and association 211 



ornatiis, new species 39, pi. I, figs. 1-3 



compared with Bathyuriscus rotundatus 41 



mentioned 17 



stratigraphic position and association 211 



