INDEX. 



363 



Obolella maculata, Sicks, . 



O. misera, Billings, 



O. nana, Meek and Hayden, 



O. nilida, Ford, 



O. Phillipsi, Boll, 



O. poliia, Hall, 



0. pretiosa, Billings, 



O. Sabriuffi, Callaway, 



O. sagittalis, Salter, 



0. transversa, Hartt, 



Oholus advena, Barrande, 



O. antiquissimus, von Eichwald, 



O. Apollinis, von Eichwald, 



O. Appolinus, Owen, 



O. ? Bohemicus, Barrande, 



O. ? complexus, Barrande, 



O. ingricus, von Eichwald^ 



O. Lahradoricus, Billings, 



O. pulcher, Matthew, 



O. Quenstcdti, Mickwitz, 



O. siluricus, von Eichwald, 



CEhlertella pleurites, Meek, . 



Orbicula antiquissima, von Eichwald, 



O. Buchi, de Verneuil, . 



O. ccelata, Hall, 



O. crassa, Hall, 



O. deformata, Hall, . 



O. Morrisi, Davidson, 



O. norvegica, Sowcrby, 



O. norvegica, Lamarck^ 



O. punctata, Sowerby, 



O. reversa, de Verneuil, 



O. ? squamiformis, Hall, 



0. terminalis, Emmons, 



Orbiculoidea, sp. ? Meek, 



0. conica, Dwight, 



O. Davidsoui, d'Orhigny, 



O. Forhesi, Davidson, . HG, 



O. grandis, Vanuxem, 



O. Herzeri, sp. nov. 



O. Morrisi, Davidson, 



O. Newberryi, Hall, 



O. nitida, Phillips, 



O. numulus, sp. nov. 



O. liiindalli. Hall, 



O. tenuilamellata. Hall, 



O. (Rosraerella) grandis, Vanuxem 



O. (Schizotreta) ovalis, sp. nov. 



Orthamhonifes transversa, Pander, 



Orihis acutiloha, Ringuebeig, 



O. acutihrata, Conrad, 



O. sequivalvis, Hall, 



O. alternata, 



O. alsa, Hall, 



O. ? apicalis, Billings, 



O. arachnoidea, Phillips, 



O. arcuaria, sp. nov., 



O. Armanda, Billings, 



O. -assimilis. Hall, 



O. Aurelia, Billings, 



O. basalis, Dalman, . 



O. Battis, Billings, 



O. Baylii, Rouault, 



0. bellarugosa. Hall, 



PAGE. 





68, 



109 



Orthis 





69 



0. 



69, 



70 



0. 



69, 



70 



0. 





94 



0. 



68, 69, 70, 72, 73, 



83 



0. 





70 



0. 



63, 



103 



0. 



. 63, 107, 



108 



0. 



70, 



107 



0. 



6S, 



69 







82 



0. 



51, 80, 82, 



339 



0. 





72 



0. 





101 



0. 



68, 



73 



0. 





82 



o. 





94 



o. 



81, 



183 



0. 





339 



0. 





82 



0. 



. U4, 



169 



0. 



. 118,119, 



140 



0. 



. 151, 



152 



0. 





69 



0. 





72 



0. 





150 



0. 



128, 129, 130, 



160 



0. 





121 



0. 





122 



0. 





140 



0. 





118 



0. 





159 



0. 





110 



0. 





127 



0. 



116, 121, 1-26, 129, 



135 



0. 





160 



0. 



, 125, 1'26, 129, 135, 



160 



0. 





133 



0- 





178 



0. 



133, 



160 



0. 





130 



0. 





136 



0. 





178 



0. 





133 



0. 



127, 



135 



0. 



I, 



178 



0. 





179 



0. 





237 



0. 





205 



0. 





223 



0. 



. 194, 



221 



0. 





203 



o. 





225 



0. 



217, 



240 



0. 





236 



0. 





224 



o. 





217 



0. 





224 



0. 





221 



o. 



. 191,192, 



207 



0. 





222 



0. 





213 



0. 





222 



0. 



PASE. 



5 bellula, James, ..... 224 



biforata, von Schlotheim, . . 190, 200, 223 



Billingsi, Hartt, 232 



BilUngsi, Safford, . . .219 



biloba, Linne, 190, S04, 205, 223 

 borealis, Billings. . . . . .222 



Bouchavdi, Davidson, .... 217 



Burlingtonensis, Hall, . . .225 



callactis, Dalman, . 191, 193, 19'>, 196, 228 



calligramma, Dalman, 190, 191, 192, 193, 194, 195, 219 



231, 233. 212, 244 



calligramma, var. Daviilsoni, de Verneuil, 193, 227 



calligramma, \&v.flabellites,¥o(^\:&tQ, . . 228 



calligramma, var. ortliamhonites, Billings, . 221 



carinata. Hall 213, 226 



circularis, ...... 259 



circulus. Ball, .... 210, 224 



Clarkensis, Swallow, . . . . .226 



Oleobis, Hall, ..... 225 



Clytie, Hall 202, 203, 223 



conciiina. Hall, .... 207, 221 



corailiiia, Waagen, ..... 210 



Corinna, Billings, .... 217 



costalis, Hall 221,227, 228 



crassa, ilfeet, ..... 223 



crenistria, Phillips, ..... 248 



crisx:)ata, Emmons, .... 224 

 Cumberlandia, Hall, . . . . .225 



cuneata, Owen, ..... 225 



cyclas. Hall 225 



cylindrica, ...... 262 



Dalyana, Miller, ..... 225 



Davidsoni, de Verneuil, . . 192, 221, 228 



Daytonensis, Foerste, .... 222 



deflecta, Conrad, ..... 222 



deformis. Hall, ..... 255 



demissa, 191, 192 



Derbyi, Waagen, ..... 214 



Desbayesi, ...... 243 



diohotoma, Hall, 221 



discus. Hall, .... 210, 225 



disparilis, Conrad, . . . 191, 221, 228 



dubia, Hall, .... 210, 225 

 electra, Billings, . . .223 



elegans, Bouchard, .... 219 



elegantula, Dalman, . 191, 192, 207, 224, 341 



elegantula, var. parva, . . . . 224 



Ella, Hall, 221 



emacerata. Hall, .... 207, 224 



eminens. Hall, .... 210, 225 



Eurekensis, WalcoLt, .... 232 



Em-yoae, Billings, .... 221, 228 



Evadne, Billings, .... 223 



excavata, Geinitz, ..... 315 



eximia, de Veriieuil, .... 266 



expansa, Sowerby, ..... 283 



extensa. Pander, ..... 219 



fasoiata, .ffaii, ..... 200, 222 



fausta, Foerste, ..... 222 



fissicosta. Hall, .... 194, 221 



nabellites. Hall, ' . . . 227, 228 



flabellulum. Hall, .... 221, 227 



flabellulum, Sowerby, .... 227 



gemmicula, Billings, .... 217, 244 



