866 



CAMBRIAN BRACHIOPODA. 



Shell structure 296-300 



Slie llsubstance, generic importance of, in classification 297 



Shens i ,Clilua, localities in C32, C32' 



Sherbrooke limestcne (Upper Cambrian), detailed section, listing 



included species and localities 125 



extension of upper boundary described 125 



localities in 57d, 58f 



Sheridan, Wyoming, localities near 14k, 168, 171, 171a 



Sheridan County, Wyoming, localities in 14k, 168, 171, 171a, 302m 



Shimer, H. W. [Grabau, A. W., and], bibliographic reference 17 



SMneton, England, locality at * 3041 



Shineton Brook, England, localities on 3041, 304p 



Shineton shales (Upper Cambrian), in generalized section for 



England, Scotland, and Wales, listing species and localities . 135 



localities in .' 3041i, 3041, 304k, 304 1, 304p 



Shipley, Ferry, Sullivan County, Tennessee, locality near 22 



Shipleys, Sullivan County, Tennessee, locality near 374c 



Shocks Gap, in Bays Mountains, Tennessee, localities in. . 10a, 10b, 106 



Shocks Ridge, in Bays Mountains, Tennessee, locality near 106a 



Shropshire, see South Shropshire. 



Shumard, B. F., bibliogiaphlc references 24 



Shumardia zone (Upper Cambrian), in generalized section for 

 Sweden, Denmark, Finland, and Norway, listing species 



and localities 145 



locality in 390b 



Shushan, New York, localities near 36, 338d 



Sias River, see Sjass River. 



Siberia, Cambrian species of, listed 121-122 



locality in 347 



Obolella cf. chromatka from, discussed 592 



Siemiradzki, J. von, bibliographic reference 24 



species named for 532 



sicmiradzkii, see LinguleUa. 



Sierra Canyon, Eureka district, Nevada, localities in 62a, 65 



Sierra County, New Mexico, localities in 327, 387a-c 



Sierra Springs, Eureka district, Nevada, locality at 56 



Signal Mountain, Comanche County, Oklahoma, locality near 12] 



signalis, see Acrotreta. 

 signata, see Acrothyra and LinguleUa, 

 sigimta orta, see Acrothyra. 

 signata prima, see Acrothyra. 



Sillery, Upper (Ordovician), locality in 220a 



Slllery conglomerate bowlder (Lower Cambrian), locality in 56a 



siluricus, see Oholus (Mickwitzella). 



Silver Canyon, Inyo County, California, locality in 7 



Silver Peak group (Lower Cambrian), localities in.. 11, Im, Ip, Iv, 141? 



Silver Peak quadrangle, Nevada, localities in 11, 



Im, Ip, Iv, 7r, 7s, 7v, 7x, 7y, 7z, Ba, 8b', 8r, 174c, 175, 184 

 similis, see LinguleUa. 



Simonds, near St. John, New Brunswick, locality in 301x 



simpler, see LinguleUa and Wimanella. 



Simpson formation, locality correlated with 105x 



Simpson Range, Utah, localities in 32h, 32z 



Simpson Spring, Utah, localities near lis, 32h, 32z 



Simrishamn, Sweden, localities near 321u, 321v 



localities northwest of 8w, 



• 3101, 320c, 320f, 3201, 320o, 320x, 321y, 390o 

 sinoe, see Obolus. 



Sintai district, China, localities in Cl-7, 



C9, CIO, C12, C57, C61, C62, C63, 064 



Sintaihien, China, locality near C57 



Sinus, shown in figure ; 374 



Siphonotreta, described 624 



classification of : 321, 324 



compared with Dearbornia 614 



Trematobolus ; 313, 616 



evolution of 317 



general geographic and stratigraphic distribution of 



the species referred to 104 



general stratigraphic distribution and number of Cam- 

 brian species and varieties of Ill 



number of Ordovician species and varieties of 113 



number of species of, in different types of sediment . - . 160 



reference to, of Siphonotreta f dubia discussed 626 



surface ornamentation discussed 302 



type species " Crania unguiculata" 625 



? dubia, described 625 



general geographic and stratigraphic distribution tabu- 

 lated 104 



type specimen figured PI. LXXXI, fig. 7 



Siphonotreta fissa, discussed 622 



"ladogensis," discussed 308, 369 



type of Helmersenia 367 



unguicvZata, described 626 



compared with Keyserlirigia 628 



Siphonotreta ? dubia 626 



Siphonotreta verrucosa 627 



described and discussed 625 



general geographic and stratigraphic distribution tab- 

 ulated 104 



type specimen not figured. 



verrucosa, described 627 



compared with Helmersenia ladogensis 367 



Siphonotreta unguiculata 627 



general geographic and stratigraphic distribution tab- 

 ulated 104 



type specimen not figured. 



Siphonotretacea, classification of 321, 324 



distribution in Cambrian strata 316 



genera and species referred to, described 686-630 



Siphonotretida3, classification of 321, 324 



distribution in Cambrian strata 316 



evolution discussed 3l6 



genera and species referred to, described 611-630 



general stratigraphic distribution and number of Cambrian 



genera and species of 112 



number of Cambrian genera and species of 112 



number of genera and species in monograph 113 



number of 'Ordovician genera and species in monograph 113 



Sjass (Sias) River, St. Petersburg, Russia, locality on 336 1 



Skiilsternarne Island, near Gefle, Sweden, locality on 311o 



Skane, Sweden, locality in 310h 



See also Malmohus and Christianstad. 

 Skara, Sweden, localities near... 309c, 309d, 320, 320a, 320b, 320n, 320y 

 Skaraborg, Sweden, localities in . 309c, 309d, 310q, 320, 320a, 320b, 320e, 

 320h, 320m, 320n, 320r, 320y, 321q, 321r, 390(, 390j, 390k, 390ll, 390p 



Skirosen, Sweden, locality at 8y 



Skarpn^to, Aland Island, Finland, locality at 311s 



Skiensdalen, Norway, locality in 324a 



Skrej , Bohemia, locaUties at and near 345, 345d-f , 345j , 345k 



Skrena, Norway, locality at 324a 



Slap, Bohemia, locality at ■345h 



Slapnicky mlyn, near Skrej, Bohemia, locaUty at 345k 



Slapy.near Skrej, Bohemia, locality at forester house of 345d 



Slemmern, Aland Island, Finland, localities at 311f, 311q, 311y 



Slemmestad, Norway, localities at 8x, 323p 



Slough Creek, Yellowstone National Park, Montana, locality near. 302f 



Small Hill, Comanche County, Oklahoma, locality at 12] 



Smith, E. A., species named for 417 



Smith, G. C, bibliogi'aphic reference 24 



smithi, see Obolus. 



Smith Point, Trinity Bay, Newfoundland, localities on 5 1, 6n, 60 



Smithsburg, Maryland, locality near 47d 



Smith Sound, Trinity Bay, Newfoimdland, localities on 61, 



6n, 60, 5s, 6y, 314b, 3141 



Snake Range, Nevada, localities in 8n, lOw 



sociali^, see Acrotreta. 



Soderarm lighthouse, near Norrtelje, Sweden, locality at 311u 



Sodra Mockleby, Oeland Island, Sweden, locality at 320p 



Solva, in generalized section for England, Scotland, and Wales. . . 136 



Solva, South Wales, localities at and near 318o, 318q, 318r 



South America, locaUties in 389, 389a-d 



See also Argentina. 



South Argyle, New York, locaUty near 3381 



South Australia, Cambrian species of , listed 122 



locaUties in 315, 315a-d 



South Bessemer, Alabama, locaUty at 56o 



South Dakota, Cambrian species of, Usted 114-119 



locaUties in 17j , 17k, 88a, 164, 165, 167, 355, 355a-f 



note on stratigraphic position of localities in 144 



South GranviUe, New York, locaUties near 38, 367a 



South Shropshire, England, locaUties in 304h, 3041, 304k-l, 304p 



Spain, Cambrian species of, Usted 120-121 



locaUties in 350, 350a, 350b 



.Sparagmite sandstone (Lower Cambrian), in generalized section 

 for Sweden, Denmark, Finland, andNorway,listingspecies 



and localities 146 



locality in 8y 



spatula, see LinguleUa (Lingulepis). 



