OLENELLUS AND OTHER GENERA OF MESONACID^ 



PAGE 

 Mcsonacis {Olcnellus) Peach, in synonymy 261, 268 



Mesonacis (Olenelliis) asaphoidcs Peach, in synonymy 271 



Metadoxides magnificits ? Grabau, in synonymy 284 



mickivitzi, see Mesonacis. 



Microdiscus, mentioned 348 



Micromitra nisus, mentioned 279 



Micromitra {I phidcUa) pannula, mentioned 318 



Miller, S. A., bibHographic reference 376 



Moberg, Job. Chr., acknowledgments 234 



bibliographic references 376 



mentioned 264 



Moberg, Joh. Chr., and Segerberg, C. O., bibliographic reference 376 



mobergi, see Obolella. 



Montevallo, fossils from 302, 310, 340 



Montevallo shale, fossils from 340 



Mount Bosworth, fossils from 319, 330 



Mount Holly Gap. fossils from 339 



Mount Stephen, fossils from 318, 330 



Mount Whyte, fossils from 319, 330 



Mount Whyte formation, fossils from 318, 319, 330, 331 



mentioned 301 



nevadcnsis, see Callaz'ia. 



Nevadia. new genus 256 



anterior glabellar lobe in 242, 243 



compared with EUipfoccpiiala 256, 257 



Mesonacis 257 



Olenclhis 256 



JVauiicria 298 



delimitation of genus 246 



development of, shown in diagram 249 



development of thorax in 244 



geographic distribution of 253 



mentioned 236, 244, 247, 248, 250, 269, 295 



nearest approach to Annelidian-like ancestor 256-257, 260 



new genus, species referred to the genus listed 232 



stage in development of thorax defined 244 



stage unknown in OlcncUus 313 



stratigraphic distribution tabulated 251 



zone, defined 250 



Nevadia zvccksi 257, pi. 23, figs. 1-7 ; text figs. 14 and 15 ; pi. 44, fig. i 



anterior glabellar lobe in 242 



compared with Elliptoccphala asaphoidcs 260 



Mesonacis verntontana 260 



mentioned 246, 249, 295, 300 



stratigraphic distribution tabulated 251 



nisus, see Micromitra. 



Nisusia festinata, mentioned 3r{:5 



Nisusia (Jamesella) erecta, mentioned 345 



