NO. 6 MIDDLE CAMBRIAN BRANCHIOPODA, ETC. 



PAGE 



Hymenocaris perfecta, new species 183, pi. 31, figs. 1-5 



appendages of 184 



compared with Hymenocaris vermicauda 183 



stratigraphic position and association 153 



mentioned 149, 150, 151 



Hymenocaris vermicauda, compared with Hymenocaris perfecta 183 



Hypoparia Beecher 195 



classification of 154 



Hypostoma or labrum 158 



Illasnidse, mentioned 196 



Indiana dermatoidea, representing Ostracoda 157 



Indianidse, foreshadowed by Burgess shale fauna 165 



inexpectans, see Sidneyia. 



Introduction 148 



Isoxys, representing Phyllocarida ISS 



Kaolinite, mentioned by E. S. Larsen, Jr 149-150 



Kata-biotite-orthoclase gneiss, mentioned 151 



Kiabab Plateau, Grand Canyon, Northern Arizona 198 



" Kidney crab," Burgessia 160 



Kwagunt Valley, Grand Canyon, Northern Arizona 198 



kwaguntensis, see Tontoia. 



Labium, or metastoma 1 38 



Labrum, or hypostoma 158 



of Burgessia bella 178 



" Lace crab," Marrella splendens called i94 



Laggania camhria, stratigraphic position and association 153 



lanceolata, see Fieldia. 



Lankester's Treatise on Zoology, classification outlined in 153 



referred to 148 



Larsen, E. S., Jr. of U. S. Geological Survey 149 



Leanchoil, British Columbia, Canada i/O 



Leanchoilia, new genus, discussed 170 



» classification of I54 



swimming exopodites of 160 



typical branchiopod 163 



Leanchoilia superlata, new species 170, pi. 31, fig. 6 



appendages of 171 



stratigraphic position and association I53 



Lepidurus, compared with Burgessia 165 



carapace of, compared with Burgessia bella I79 



compared with Marrella splendens 192 



Lepidurus glacialis, referred to 176 



Lepidurus-Y\ke carapace of Burgessia, mentioned 162 



Leptostraca, relations of, to Branchiopoda, iMalacostraca, Trilobita, and 



Merostomata 163 



