146 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



PAGE 



Leanchoilia superlata, new species (pi. 31) 170 



Genus Yohoia, new genus 171 



Yohoia tenuis, new species (pi. 29) 172 



Appendages 1 72 



Dimensions 1 73 



Yohoia plena, new species (pi. 29) 1 73 



Genus Bidentia, new genus 173 



Bidentia difUcilis, new species (pi. 30) 174 



Appendages 1 74 



Dimensions 1 74 



Order Notostraca 1 75 



Family Naraoidse, new family 175 



Genus Naraoia, new genus 1 75 



Naraoia compacta, new species (pi. 28) 175 



Appendages 1 76 



Interior structure 176 



Family Burgessidse, new family 177 



Genus Burgessia, new genus 1 77 



Biirgessia bella, new species (pis. 27, 30) 177 



Eyes 178 



Labrum : 1 78 



Appendages 1 78 



Interior structure 1 79 



Dimensions 1 79 



Family (Undetermined) 180 



Genus Anomalocaris Whiteaves 180 



Anomalocaris gigantea, new species (pi. 34) 180 



Family Waptidae, new family 180 



Genus Waptia, new genus 181 



Waptia Heldensis, new species (pi. 27) 181 



Appendages 182 



Alimentary canal 182 



Dimensions 182 



Sub-Class Malacostraca 182 



Order Hymenocarina Clarke 182 



Family Hymenocaridse Salter 182 



Genus Hymenocaris Salter 182 



Hymenocaris perfecta, new species (pi. 31) 183 



Appendages 184 



Interior structure 184 



Dimensions 184 



Hymenocaris ? circularis, new species (pi. 2^) 184 



Hymenocaris obliqua, new species (pi. 32) 185 



Hymenocaris ovalis, new species (pi. 32) 185 



Hymenocaris ? parva, new species (pi. 32) 185 



Family (Undetermined) 186 



Genus Hurdia, new genus 186 



Hurdia victoria, new species (pi. 32) 186 



Hurdia triangulata, new species (pi. 34) 186 



Genus Tusoia, new genus 187 



Tuzoia retifera, new species (pi. 33) 187 



