SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



PAGE 



Mollisotiia symmetrica, new species 196, pi. 24, fig. 3 



compared with MoUisonia gracilis 198 



Mount Bident, Alberta, Canada 174 



Mount Carnarvon, British Columbia, Canada 189 



Mount Field, British Columbia, Canada 188 



Mount Habel, British Columbia, Canada 202 



Mount Hurd, British Columbia, Canada 186 



Mount Molar, Alberta, Canada 200 



Mount Mollison, British Columbia, Canada 196 



Mount Odaray, British Columbia, Canada 188 



Mount Tuzo, Alberta, Canada 187 



Mount Wapta, British Columbia, Canada l8i 



Narao, group of lakes, British Columbia, Canada 175 



Naraoia, new genus, discussed 175 



classification of 154 



double shield of 157 



no living representatives 165 



shield of 157 



Naraoia compacta, new species 175, pi. 28, figs. 3 and 4 



appendages of 176 



compared with Burgessia bella 176 



stratigraphic position and association 153 



Naraoidse, new family, described 175 



classification of 154 



Nathorst, Dr. Alfred G., generic name N athorstia in honor of 194 



Nathorstia, new genus, discussed 194 



as a generalized trilobite 163 



classification of 154 



no living representatives ■. 165 



Nathorstia transitans, new species 194, pi. 28, fig. 2 



appendages of 195 



compared with Molaria spinifera 195 



relation to Molaria spinifera 191 



stratigraphic position and association 153 



Nebalia, representing Phyllocarida 162 



compared with Hymenocaris 165 



Nebaliacea, carapace of 157 



Nebnliopsis typica Sars, compared with Tusoia 165 



compared with Tusoia retifera 187 



reticulated surface of carapace of 158 



Neolenus, appendages of 190 



caudal rami of 191 



rami of 159 



Neolenus serratiis (Rominger) , appendages of igo, 191 



resemblance to Waptia Heldensis 191 



stratigraphic position and association 153 



