494 INDEX 



PAGE 



tuinidosus, see Agnostus. 



Turner, H. W., bibliograpliic references ; i6 



tutia, see Anomocarella and Ptychoparia {Liosiracus). 



Tusoia Walcott, new genus discussed 187 



bivalve carapace of 157, 158 



classification of 154 



compared with Ncbaliopsis typica Sars 165 



(footnote) 154 



retifera Walcott, new species described 187 



figured, pi. 2)3, fig- 2 226 



compared with Nebaliopsis typica Sars 187 



stratigraphic position and association 153 



typica, see Palcsacmcca. 



typicalis, see Dorypygella, Schizambon, and Tcinistioii. 



typiis, see Conocephalitcs and Ptychoparia. 



Ulrich, E. O., cited in discussion of Calvinclla ocarkensis 390 



cited on Eminence formation 256 



relation of Potsdam and Aylnier sandstones 253 



use of " St. Croixan " 257, 307 



fossils collected by 390 



investigation by, during 1913 353 



Unconformity between Cambrian and pre-Cambrian 11 



by erosion, Robson Peak district 340 



imdata, see Anomocarella and Ptychoparia. 



Unkar terrane, section 4 



Upper Cambrian, apparent association with Ordovician 253 



Bosworth section, stratigraphic section 342 



Cambrian system, stratigraphic section, Robson Peak district. 2)2i7 

 former classification of formations in Wisconsin and Minne- 

 sota '. 353 



Hoyt quarry fauna referred to 252 



in provisional classification 354 



locality I2g, Arbuckle limestone, Oklahoma 372 



locality 20b, Colorado 277 



locality 62, Adams Hill, Nevada 361 



locality 66, Dunderbcrg mine, Nevada 362 



locality 70a, fauna associated with Dikelocephalinse 359 



locality 76, Hoyt limestone, Saratoga, New York. .. .258-294, 372 



locality 76a, Hoyt limestone, New York 262 



locality 77, Potsdam sandstone, New York 262-304 



localities 78 and 78b, Osceola, Wisconsin 361 



locality 85, described and fauna listed 360 



locality 85b, St. Croix River, Minnesota ' 371 



' localities 85 and 86, Wisconsin 370 



locality 86 in Wisconsin 360 



locality 86b, Lansing, Iowa 371 



locality 97, Lake Pepm, Minnesota 371 



locality 99, Minneiska (Miniska), Minnesota »379, 388 



