47^ INDEX 



PAGE 



Olenopsis Bornemann, genus described 240 



compared with Olenus, Liostraciis, and Ptychoparia 241 



genotype, Olenus zoppii Meneghini 240 



geographic distribution 241 



in synonymy 240 



species Hsted and discussed 240 



stratigraphic range 240 



discussed • 239 



relation to Olenellus and Ptychoparia 239 



localities, Canada, Montana, Pennsylvania 242-246 



? agnesensis Walcott, new species described 342 



figured, pi. 36, fig. 2 248 



in synonymy 242 



compared with Olenopsis zoppii, O. americanus, and O. 



roddyi 242 



Ptychoparia and Liosiracus 242 



Olenopsis americanus 244 



listed and discussed under genus 240, 241 



americanus Walcott, new species described 243 



figured, pi. 36, figs. 8-1 1 248 



associated with Acrothele collcni, WimaneUa simplex, and 



Albertella Helena 244 



compared with Olenopsis ? agnesensis and O. roddyi 244 



Olenopsis zoppii 244 



Olenopsis ? agnesensis 242 



in synonymy 243 



listed and discussed under genus 240, 241 



surface suggests Mesonacidae 243 



roddyi Walcott, new species described 244 



figured, pi. 36, fig. 1 248 



associated with Olenellus thompsoni 240 



Pcedeumias transitans 246 



compared with Olenopsis ? agnesensis 242 



Olenopsis americanus 244 



dimensions • 246 



listed and discussed imder genus 240, 241 



surface suggests Mesonacidae 245 



zoppii (Meneghini), described 242 



figured, pi. 36, figs. 3-7 248 



in synonymy 242 



compared with Olenopsis ? agnesensis 242 



discussed 241 



occurrence discussed 239 



Olenus, compared with Olenopsis 241 



Oneida County, New York, drift block with fossils from 253 



Oneota formation, in provisional classification 354 



Opabin, a pass, British Columbia, Canada 167 



Opabinia Walcott, new genus discussed 166=167 



classification of 154 



epipodite and protopodite of 159 



