364 
INDEX. 
Orthis gibbosa, Billings, . 
Halli, Safford, 
hemipronites, von Buch, 
hipparionyx, Schnur, 
Hippolyte, Billings, 
Holstoni, Safford, 
hybrida, Sowerby, 
idonea, Sail, 
imperator, Billings, 
impressa, Hall, 
incisiva, Waagen, 
infera, Calvin, 
insculpta, Ball, 
insignis, Hall, . 
insularis, 
Iowensis, Hall, 
Ipbigenia, Billings, 
Jamesi, Hall, . 
Kankakensis, McChesney, 
Kaskaskiensis, McChesney, 
Keokuk, Hall, 
laticosta, Meek, 
Laurentina, Billings 
lenticularis, Wallenberg, 
lentiformis, Hall, 
Leonensis, Hall, 
Leucosia.'-Soli, 
lepida, Hall, 
lepida, Schnur, 
Livia, Billings, 
Leonensis, Walcott, 
loricula, sp. nov., 
Lucia, Billings, 
lynx, von Eichwald, 
Macfarlanii, Meek, 
Macleodi, Whitfield, . 
Maria, Billings, 
marmorea, Waagen, . 
Meeki, Miller, 
Merope, Billings, 
Michelini, Leveille, . 
' mimica, 
Minneapolis, H. H. Winchell 
Missouriensis, Swallow, 
Morganiana, Derby, 
multisecta, Meek, 
mullistriata, Hall, 
musculosa, Hall, 
Mycale, Billings, . 
Nevadensis, Meek, 
Nisis, Hall, 
oblata, Hall, 
occasus, Hall, 
occidentalis, Hall, 
Oluierana, de Verneuil, 
Orbignyi, Davidson, 
orthambonities, Billings, 
Oweni, sp. nov., 
Panderiana, sp. nov., 
Pecosi, Marcou, 
pecten, Dalman, 
pectinella, Emmons, . 
pectinella, Emmons, vai 
peduncularis, Hall, 
PAGE. 
Orthis Peloris, Hall, ..... 225, 343 
O. Penelope, Hall, .... 211, 225 
O. Penniana, Derby, .... 210, 226 
O. Pennsylvanica, Simpson, . .225 
0. Pepina, Hall, ..... 230, 232 
O. perelegans, Hall, .... 207, 224 
O. perveta, Conrad, .... 207, 224 
O. planoconvexa, Hall, 207, 224 
O. platys, Billings, . .218 
O. plicatella, Hall, 194,196 , 221 
O. porcata, McCoy, .... 197, 222 
O. prava, .Hall, ;..... 255 
O. productoides, Murchison, .317 
O. propinqua, Hall, .... 212, 226 
O. punctata, Hall, ..... 217 
O. punctostriata, ..... 217 
0. Quacoensis, Matthew, . .232 
O. quadrans, Hall, ..... 224 
O. recta, Conrad, .222 
O. resupinata, Martin, 194,211,213, 226 
O. resupinoides, Cox, .... 213, 226 
O. retrorsa, Salter, .... 197, 222 
O. retrorsistria, . . .203 
O. reversa, ...... 197 
O. robusta. Hall, . . . .262 
O. rugiplicata, Hall, ..... 217 
O. Saffordi, sp. nov., .... 218,340 
O. Seovillii, Miller, . 222 
O. sectostriata, . . .221 
O. Semele, Hall, ..... 225 
O. senecta, sp. nov., . .226 
O. sinuata, Hall, . 198, 212 
O. socialis, . .200 
O. solitaria, Hall, ..... 225 
O. spiriferoides, McCoy,.. . . . .271 
O. Stonensis, Safford, .... 224 
0. striatella, Dalman, .... 191, 305 
O. striatula, Schlotheim, .... 213 
O. strophomenoides, Hall, 199, 223 
O. subajquata, Conrad, . 194,207, 224 
O. subcarinata, Hall, .... 207, 221 
O. subelliptica, White and Whitfield, 225 
O. suborbicularis, Hall, .225 
O. subquadrata, Hall, 194, J96, 197, 341 
O. superstes, sp. nov., .... 217, 224 
O. Swallowi, Hall, .... 213, 226 
O. Sweeneyi, N. H. Winchell, . 196,222, 228 
O. testudinaria, Dalman, 190, 191, 192, 205, 206, 207, 217 
218, 224 
O- tetragona, ...... 219 
O. Thiemii, White, .225 
O. Tioga, Hall, .... 212, 226 
O. tricenaria, Conrad, 191, 193, 221 
O. triplicatella, Meek, 194, 221 
O. Tritonia, Billings, .... 217, 232 
O. tubulostriata, Halt, 210, 225 
O. Tulliensis, Hall, .... 212, 226 
O. uberis, Billings, ..... 224 
O. umbraculum, ..... 248, 256 
O. Vanuxemi, Hall, .... 225, 342 
O. Vanuxemi, var. pulchella, Herrick, . 225 
O. varica, Conrad, .... 204,205, 223 
O. Wangenheimmi, de Verneuil . .319 
O. Wisbyensis, .... 207 
