INDEX 473 



PAGE 



Ottoia Walcott, new genus described 128 



compared with Sipunculoidea 128 



discussed 127 



genotype, Ottoia prolifica 128 



geographic distribution 128 



stratigraphic range 128 



suggests Hirudinea (leeches) 127 



Polychasta 127 



minor Walcott, new species described 129 



figured, pi. 22, figs. 5, 6 142 



compared with Ottoia prolifica 129 



Ottoia tenuis 130 



stratigraphic position and association 153 



prolifica Walcott, new species described 128 



figured, pi. 19, figs. 1-5 136 



associated with Planolites sp. ? '. 142 



compared with Aysheaia pedunciilata 117 



Ottoia tenuis 130 



genotype of Ottoia 128 



compared with Ottoia minor 129 



locality compared with that of BanfHa constricta 131 



stratigraphic position and association 153 



tenuis Walcott, new species described 130 



compared with Ottoia minor and O. prolifica 130 



Ottoidae Walcott, new family described 128 



BanMa and Ottoia referred to 128 



Otusia sandbcrgi N. H. W^inchell, listed from Franconia formation 357 



ovalis, see Hymenocaris. 



Ovando quadrangle, Montana, Lower Cambrian locality 4v 244 



Owen, David Dale, Dikelocephalus minnesotensis first illustrated by 365 



species, referred by Hall to Ptychaspis and Conoccphalitcs . . 366 



Owen, Richard, cited in discussion of Protichnites 275 



Owenella aiitiqicata (Whitfield), listed from locality 78 361 



listed from locality 85 360 



with St. Lawrence fauna 356 



cf. antiquata (Whitfield), listed from locality 78b 361 



vaticina (Hall), listed with St. Lawrence fauna 356 



listed from locality 113 360 



oweni, see Anotnocarella Conaspis, Conocephalites, Dikelocephalus, and 



Lingulella. 

 ozarkensis, see Calvinella. 



Ozarkian formations, correlation of Madison and Mendota with 353 



Ozarkian group of formations, cited from Ulrich 390 



Ozarkian (=: Lower Ordovician ?) localities 390 



in provisional classification 354 



pacifica, see Albert el la. 



Packard, cited on Synziphosura 19 



Pccdcumias transitans Walcott, associated with Olenopsis roddyi 246 



compared with Olcncllus truemani 316 



