OLENELLUS AND OTHER GENERA OF MESONACID^ 



EUiptocephala — Continued. page 



nature of posterior segments of 269 



segmentation of cephalon 238 



species referred to the genus listed 232 



stage in development of thorax defined 244 



stratigraphic distribution tabulated 251 



stratigraphic range of 268 



zone, defined 250 



EUiptocephala asaphoidcs Emmons 269, pi. 24. figs, i-io; pi. 25, figs. 1-18; 



and pi. 44, fig. 3 



Cole, in synonymy 271 



Emmons, in synonymy 269 



compared with Nevadia zveeksi 260 



Olcnelloides armatus 346, 349 



Olenellus claytoni 3I9 



Olencllus lapzvorthi 332 



Olenellus logani 334 



Olenellus?? walcotti 341 



Pcedemnias transitans 310 



development of cephalon 236 



hypostoma of 243 



mentioned 235, 246, 247, 256, 258, 259, 268, 274, 295, 333 



palpebral segment in 243 



stratigraphic distribution tabulated 251 



young compared with those of Wanneria? gracile 299 



IVanncria halli ■ 297 



EUiptocephala thonipsoni Miller, in synonymy 337 



EUiptocephala (Mesonacis) Beecher, in synonymy 261 



Eliptocephalus Emmons, in synonymy 267 



Marcou, in synonymy 267 



asaphoidcs Emmons, in synonjany 269 



Marcou, in synonymy 270 



(Paradoxides) asaphoidcs Emmons, in synonymy 269, 337 



(Schmidtia) Marcou, in synonymy 261 



mickzvitzi Marcou, in synonymy 262 



vennontana Marcou, in synonymy 266 



elongata, see Stenotheca. 



Emigsville, fossils from. 340, 341 



Emmons, E., bibliographic references 373 



erecta, see Nisnsia (Jamesclla). 



Esmeralda, fossils from 330 



Esthonia formation, mentioned 263 



Esthonia, Russia, fossils from 263 



Eureka District, fossils from 285, 322, 323, 345 



Eyes of trilobites, general discussion of 239-242 



Facial sutures in the Mesonacidae discussed 242 



favosa, see Obolella (Glyptias). 

 festinata, see Nisusia. 

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