546 INDEX 



PAGE 

 politus, see Dicellomus. 

 pomona, see Alokistocare. 

 ponderosa, see Norwoodia. 



Porifera, discussed 58 



Post Oak Springs, Tennessee, Middle Cambrian locality 11 337 



Potatotop Hill, Burnet County, Texas, Upper Cambrian locality 67a 213 



Potsdam, age, compared Sai-ma-ki and Ta-ling Trilobita 6 



Potsdam sandstone formation, Upper Cambrian localities 77, 109, iioa, 



III, 136a 194 



Poughkeepsie, New York, Upper Cambrian unnumbered locality near. .. . 197 



Powell County, Montana, Lower ? Cambrian localities 4V and 4q 339 



Lower ? Cambrian localities 4w and 8j - 340 



Middle Cambrian locality 3J 362 



Powers, Sydney, specimen collected by 352 



powersi, see Bathyuriscus (Poliella). 



Prairie du Sac, Wisconsin, Upper Cambrian locality 85 406 



Pre-Cambrian, Algonkian algal flora, introduction 79 



Algonkian formations 265 



Big Snowy Mountains, Montana 273 



continental conditions, discussed by Walcott 290 



divided from Paleozoic 38 



fauna, Steeprock Lake 98 



formations. Little Belt section 273 



surface, discussed by Walcott 289 



and Cambrian at Helena, discussed 280 



unconformity between 282 



Pre-Carboniferous life provinces, Reed cited 12 



premesnili, see Drepanura. 



primus, see Bathyuriscus {Poliella). 



Proampyx burea (Walcott) (=Ptychoparia (Proampyx) burea), generic 



references 16 



listed, Sin-t'ai Upper Cambrian 67 



stratigraphic and geographic position 47 



probus, see Bathyuriscus (Poliella). 



productus, see Bathyuriscus and DoUchometopus. 



Productus gallatinensis, in Beaver Creek section 272 



ovatus, in Beaver Creek section 272 



semireticulatus, in Beaver Creek section 272 



Proetus (Phaeton) slatkowskii (=Dorypyge), listed, Siberian, Schmidt. . 8 



Proparia Beecher, order named 161, 407 



genera of, association 161 



not evolved through Opisthoparia 407 



proskurjakozui, see Archceocyathus. 



Prospect Mountain, Eureka County, Nevada, Middle Cambrian locality 



52a 187 



formation, Middle Cambrian locality 52a 187 



prospectense, see Alokistocare. 

 prospectensis, see Ptychoparia. 



