468 SiMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



PAGE 



Neolenus inUatus, new species 30, pi. 5. figs. i-5 



compared with Neolenus intermedins 34, 35 



Neolenus serratus 33 



Neolenus superbus 33) .38 



stratigraphic position and association 180 



Neolenus intermedius, new species 34, pl- 6, figs. 1-7 



compared with Neolenus inilatus 34, 35 



Neolenus intermedins pugio 35 



Neolenus superbus 34, 35 



stratigraphic position and association 180 



Neolenus intermedius pugio, new variety 35, pl- 6, figs. 8-9 



compared with Neolenus intermedins 35 



Neolenus superbus 35 



stratigraphic position and association 180 



Neolenus serratus, compared with Neolenus inilatus Zi 



compared with Neolenus superbus 38 



mentioned 35, 39 



stratigraphic position and association 210, 211 



Neolenus superbus, new species 36, pl. 4, figs. 1-5 



compared with Neolenus inilatus 33, 38 



Neolenus intermedius 34, 35 



Neolenus intermedius pugio 35 



Neolenus serratus 38 



stratigraphic position and. association 180 



Neolenus sp. undt, stratigraphic position and association. . . .198, 199, 209, 210 



Neotremata, classification of 142 



defined MS, I57 



evolution of genera of pl. 11 (pp. 140-141) 



Nepionic, defined 157 



Nevada, boundary of Cambrian land area in 168 



Pioche formation in 11, 12 



nevadensis, see Collavia. 



Nevadia, new genus 256 



anterior glabellar lobe in 242, 243 



compared with Elliptocephala 256, 257 



Mcsonacis 257 



Olenellus 256 



Wanner ia 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 Olenellus 3^3 



stratigraphic distribution tabulated 251 



zone, defined 250 



