INDEX 473 



PAGE 



Obolus (JVestonia) tvasaichensis, new series 69, pi. 8, figs, i and la 



compared with Obolus {Westonia) ella 6g 



Obolus (Westonia) Unlandensis 69 



stratigraphic position and association 194, 195 



Obolus sandstone, thin sections of fossils from 151, 165 



occidens, see Mickivitsia. 



occidcntalis, see Bathyuriscns. 



Occipital segment defined 238 



Ocular segment defined 238 



Oehlert, D. P., bibliographic reference 114 



on " Lakhmina " 74> 75 



wlandicus, see Paradoxides. 



Ogygia serrata = Ncolenus scrratus 33. 38 



Ogygopsis klotzi, mentioned i? 



stratigraphic position and association , . . .210, 211 



Ogygopsis sp. undt., stratigraphic position and association. .. .180, 181, 198, 



199, 209 



Ogygopsis fauna, mentioned 4. 22 



Ogygopsis shale, defined 4 



fossils from 17 



Mount Stephen, notes on 210-21 1 



blandicus, see Paradoxides. 



Olenellidae Lindstrom, reference to 236 



Moberg, reference to and included species 236 



Vogdes, reference to 236 



first use of term and reasons for its rejection 233 



Olenelloidcs Peach 345 



Beecher, in synonymy. 345 



Moberg, in synonymy 345 



Peach, species referred to the genus listed 232 



a degenerate genus of the Mesonacidje 347 



delimitation of genus 248 



development of, shown in diagram 249 



development of thorax in 245 



mentioned 236 



segmentation of cephalon 238 



stratigraphic distribution tabulated 251 



see also Olenellus (Olenelloidcs). 



Olenelloides armahis Peach . . . .' 347, pi. 40, figs. 2 and 3 



Moberg, in synonymy 347 



compared with ElUptocephala asaphoidcs 346, 349 



Olenellus gilberti 346, 347 



Pcedeumias transitcDis 346, 350 



mentioned 342 



stratigraphic distribution tabulated 251 



Olenellus Hall 311 



Bernard, in synonymy 268, 312 



Cole, in synonymy 312 



