INDEX 



The references in heavy-faced type refer to the locality numbers and the 

 pages upon which the genera and species are described and figured. 



PAGE 



abaris, see Agraulos and Inouyia. 



abdcrns, see Menocephahis and Solcno pleura. 



"Abrupt appearance of Cambrian fauna on North American continent". i 



acalle, see Agraulos and Inouyia. 



acantha, see Menocephahis and Solenopleura. 



acidalia, see Menocephalus and Solenopleura. 



Acidaspis, compared with Marrclla ( footnote) 162 



Acrothelc, listed in stratigraphic section 337 



sp. undt., listed in stratigraphic section 336 



sp., listed from locality 201a 359 



Acrotreta cf. dcprcssa Walcott, listed in stratigraphic section 337 



idahocnsis Walcott, compared with Acrotreta venia 75 



listed from locality 201a 359 



cf. sagittalis Salter, listed in stratigraphic section 336, 337 



shantungensis Walcott, compared with Acrotreta vcnia 75 



spinosa Walcott, listed from locality 62 361 



venia Walcott, new species described 75 



figured, pi. 14, figs. 4, 4a 102 



compared with Acrotreta shantungensis Walcott 75 



Acrotreta idahoensis (Walcott) : 75 



listed, Cambrian faunas of China 73 



sp. undt., listed in stratigraphic section 336 



Actinopoda, order named 45 



from Middle Cambrian 43 



acuminata, see Lingulella (Lingulepis). 

 acuiiiinatus, see Obolus (Lingulepis). 



Adams Hill, Nevada, Upper Cambrian locality 62 361 



Adirondack Mountains, New York, geographic distribution of Dikclo- 



cephalus in 364 



Potsdam sandstone exposed in 252 



Adolphus Lake, Robson Peak district, locality described 328 



adrastia, see Levisia and Menocephalus. 



afHnis, see Euloma. 



agcnor, see Agraulos and Levisia. 



Aglaspidse Clarke 200 



classification of 155 



Emeraldella referred to 203 



possible relation of trilobite to 163 



I 413 



