448 INDEX 



PAGE 



Hurdia Walcott, new genus discussed 186 



classification of iS4 



mentioned (footnote) IS4 



iriangiilata Walcott, new species described 186 



figured, pi. 34, fig. 1 228 



stratigraphic position and association 153 



victoria Walcott, new species described 186 



figured, pi. 32, fig. 9 224 



stratigraphic position and association 153 



Hutam (east) Mountain, new name 333 



Robson Peak district 340 



hydriformis, see Synaptula. 



Hymenocaridae Salter 182 



classification of 154 



Hymenocarina Clarke, order named 182 



bivalve stage of 157 



classification of 154 



descendant from Branchiopoda 164 



order of, in Ordovician, Silurian, and Devonian 155 



Hymenocaris Salter, genus discussed 183 



bivalve carapace of 157 



classification of 154 



compared with Nebalia 165 



distributed in lower half of Middle Cambrian 155 



of Leptostraca 163 



rami, segmentation, and cercopods 159 



synonymy of 182-183 



mentioned 155 



? circularis Walcott, new species described 184 



figured, pi. 32, fig. 4 224 



stratigraphic position and association 153 



obliqua Walcott, new species described .- 185 



figured, pi. 32, figs. 1-3 224 



stratigraphic position and association 153 



ovalis Walcott, new species described 185 



figured, pi. 32, figs. 5, 6 224 



stratigraphic position and association 153 



f parva Walcott, new species described 185 



figured, pi. 32, fig. 7 224 



stratigraphic position and association 153 



per fc eta Walcott, new species described ■. 183 



figured, pi. 31, figs. 1-6 222 



appendages of 184 



compared with Hymenocaris vcrmicauda 183 



stratigraphic position and association 153 



mentioned 149, 150, 151 



vermicauda, compared with Hymenocaris perfecta 183 



sp. undt., listed in stratigraphic section 339 



new Lower Cambrian subfauna 3 id 



