INDEX 483 



PAGE 



Robson section, comparison of, with Bosworth section 342 



" Robson," used for six features 33^ 



robsonensis, see Chuangia. 

 robusta, see Coosia. 



Roddy, H. Justin, new species discovered by 314 



specimen found by and specific name given in recognition of. 246 

 roddyi, see Olenopsis. 



Rosse Bridge, New York, Upper Cambrian locality 367h 262 



rozvei, see Holmia. 

 riistica, see Saukia. 



Sagitta, Amiskwidas related by external form to 112 



compared with Amiskwia 112 



sagittalis, see Acrotreta. 

 sagittiformis, see Amiskwia. 



"St. Croix sandstone," Wisconsin, Upper Cambrian locality 99c 262-300 



St. Croixan, in provisional classification 354 



prior use of, discussed 257 



and Saratogan, use of terms, discussed 256 



or Upper Cambrian, to replace " Saratogan " 306 



St. Lawrence fauna, listed 356 



formation, described 355 



in provisional classification 354 



Upper Cambrian localities 85, 86, and 1 13 360 



Upper Cambrian locality 78, Wisconsin 361 



Upper Cambrian, at Osceola, Wisconsin 361 



limestone, listed with Upper Cambrian of Minnesota 353 



St, Lawrence Valley, Canada, geographic distribution of Dikelocephalus. 365 



St. Pif'an formation, comparative stratigraphic sections 343 



summary, stratigraphic section 342 



Salisbury, see Chamberlin. 



Salter, J. W., interpretation of Dikelocephalus cited 366 



salteri, see Obolus (Broggeria). 



San Saba County, Texas, Saukia cf. coloradoensis from 378 



Sapa (black) Mountain, Robson district, new name 333 



illustrated, pi. 59, fig. 2 342-343 



" Saratoga," name restricted to the Cretaceous 257, 306 



Saratoga County, New York, reconnaissance work 252 



Saratoga Springs, New York, Upper Cambrian locality 76 258-294, 372 



" Saratogan," erroneously used for Upper Cambrian series 305 



and St. Croixan, use of terms, discussed 256 



fauna, as represented" in Dutchess County, New York 255 



correlated with Dikelocephalus fauna ; . 253 



Ulrich's placing of, cited 255 



saratogensis, see Agraulos, Billingsia, Matherella, Ptychoparia, and 

 Trochus. 



" Saratogian," formations and fauna included under 252, 253 



Sardinia, Canal Grande, Cambrian locality ' 248 



Cambrian strata of, discussed 239 



