INDEX TO TAKT II. 



651 



Ostrea strigilecula 287 



sp.? 285 



Paiacyclas elliptica 248 



occidentalis 248 



peroccideiis 248 



reiitacriuitesasteriscusf.. 280 



rernio Carbouiferons, Fossils of the 273 



ricifjiostoma lincata 293 



riagiostoma occideutalis 292 



riatyceras 202 



Polypora 202 



I'orambonites obscurus 234 



Fosulononiya ? fragosa 249 



Potsdam group, Fossils of the 205 



Primordial, Fossils of tbe 205 



Productus elegans 265 



Fleming! rar. Burlingto- 



iieusis 2G5 



Isevicostus "? 2(i6 



raesialis . 200 



Prattenianns 207 



semireticulatus 207 



I'roetus Loganensis 204 



macrocephahis 203 



peroccidens 202 



rteroecpkalia Sanctisabcc 200 



PterocepLalus laticeps... 221 



Saiicti-sab;c 223 



Ptjcbaspis Miuiscaensis 224 



pustulosa 223 



Papbistoma acuta 235 



leuticularis 235 



staiiiiuea 235 



Pbyucbouella cuboides 247 



Eniniousi 247 



gnatbopbora ? 284 



Myriua 284 



pustulosa "? 257 



variaiis 284 



venusta 247 



San Saba Valley, Potsdam sand- 

 stones of 199 



Pajio. 



Sedgewickia ? concava 270 



Septocaudia 294 



Septocardia Uarditoidea 290 



typica 295 



Silurian, Fossils of the . 232 



Snowstorm Hill, Fossils and sec- 

 tion of 203 



Spirifera alba-piueusis 255 



Spirifera ? alia 281 



Spirifera biplicatus 255 



centronata 254 



Spirifcr ? Bomfraiji f 281 



Spirifera imbrex 271 



Maia 250 



setigera 270 



striata 209 



sp. ? 271 



Spiriferina alia 281 



Ilomfrayi"^ 281 



Straparollus Opbireusis 201 



planodorsatus 259 



planus 259 



similis var. planus 259 



urabilicatus 201 



Utabensis 259 



Streptorbyncbus eqnivalvis 252 



iullatus 252 



Stropbodonta Canace 240 



Stropbomeua Nemea 233 



rbomboidalis 253 



Syringopora 202 



Tancredia Warrenana 297 



Terebratula Augusta . . 285 



nuniboldteusis . . 282 



Utah 258 



Triassic, Fossils of tbe 280 



Trigouia Conradi 294 



quadrangularis 293 



AVaverly group, Fossils of the 251 



Whitfield, P. P., and Hall, James, 



Peport of 197 



