450 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



Elliptocephala — Continued. page 



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 



Elliptocephala-asaphoides 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 Ncvadia zueeksi 260 



Olenelloides armatus : 346, 349 



Olenellus claytoni 319 



Olencllus lapworthi 332 



Olenellus logani 334 



Olenellus f ? ivalcotti 341 



Padeumias transiians 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 



Wanneria halli 297 



Elliptocephala thompsoni Miller, in synonymy 2,2,7 



Elliptocephala (Mesoiiacis) Beecher, in synonymy 261 



Elliptocephalus Emmons, in synonymy 267 



Marcou, in synonymy 267 



asaphoidcs Emmons, in synonymy 269 



Marcou, in synonymy 270 



(Paradoxides) asaphoides Emmons, in synonymy 269, 22>7 



(Schmidtia) Marcou, in synonymy 261 



mickzvitzi Marcou, in synonymy 262 



vennontana Marcou, in synonymy 266 



Elliptocephalus, see also Olenellus (Elliptocephalus). 



elongata, see Stenotheca. 



elongatus, see Obolus (Westonia) and Olenellus lapworthi. 



Embolimus rotundatus = Bathyuriscus rntundatus 41 



Emigsville, fossils from 340, 341 



Emmons, E., bibliographic references 373 



emmonsi, see Hyolithes communis. 



Empire shales, Dearborn River, mentioned 203 



Encrinuridae, compared with Burlingidae 15 



endlichi, see Micromitra sculptilis. 



Endoceras, stratigraphic position and association 191 



Eocystitcs ? longidactylus, stratigraphic position and association 184, 197 



Eoorthinse, classification of 142 



defined 148 



