IXDEX 



Ogygopsis — Continued. page 



klotsi (Rominger). described 377 



figured, pi. 66. figs, i, la-b 454 



compared with Orria elegans 377 



most abundant fossil at Mount Stephen locality 377 



referred by Freeh to Dolichometopus 358 



synonymy 7,77 



Ogygopsis shale, Stephen formation. British Columbia, Middle Cambrian 



locality 14s 351 



Dolichometopus productus from 363 



Ogygopsis zone, Stephen formation, British Columbia, Middle Cambrian 



locality 14s 346. 347. 364. 378 



Olenellus, in association with Saltcrella 321 



canadensis, above Bathyuriscus (Poliella) primus S53 



associated with Corynexochus (Bonnia) ficldensis 327 



listed 353 



gilberti Meek, synonymic reference 406 



thompsoni Hall, associated with Corynexochus {Bonnia) parvulus. . 329 



listed 322 



thompsoni crassimarginatus Walcott, listed 321 



Olenidse Burmeister, family named 401 



Olenoides, associated with Asaphiscus (Blainia) glabra 394 



compared with Xeolcnus and Oryctocephalus 308 



fordi Walcott. listed 317 



Olcnopsis ag)iesensis Walcott, listed 353 



Olenopsis amcricanus Walcott. listed 339 



Onaqui Mountains, Utah. Middle Cambrian locality 3! 371 



Ophir City. Utah, Middle Cambrian localities 3296, 3c 371 



Opisthoparia, described under Corynexochidse 308 



Ogygiocarinje 375 



Proparia not evolved through 407 



Oquirrh Range, Utah, Middle Cambrian localities 3296, 3c 371 



Ordovician genera of Ogygiocarinae, foreshadowed in Ogygopsis and 



Orria 376 



Ore Hill, Pennsylvania, Upper Cambrian locality 1070 392, 393 



ornatus, see Bathyuriscus. 



Orr formation, Utah, Middle Cambrian localities 30 I, 3oy 374 



Orria, new genus, described 379 



compared with Bathyuriscus (footnote) 379 



Bathyuriscus, Ogygopsis, and Ogygiocaris 380 



genotype, Orria elegans Walcott 380 



relation to Ogygopsis 380 



str^tigraphic and geographic range 380 



suggests Ogygiocaris buchii (Brongniart) 380 



under Ogygiocarinae 375 



elegans, new species, described 381 



figured, pi. 66, figs. 2, 2a-b 454 



associated fauna, listed under Marjumia typa 402 



compared with Ogygopsis klotsi (Rominger) 377 



genotype of Orria 380 



listed 403 



