INDEX. 
387 
PAGE. 
PAGE. 
Oi'this rcversa, Salter, . 
I, 197 
Orthothetes pecten,- Balman, . 
. I. 
350 
O. 
robusta, Hall, . . . 
I, 263 
0. 
radiata, Fischer, 
I. 
256 
O. 
ruglpllcaia, Hall, 
I, 217 
0. 
socialis, Fischer, 
I, 
256 
O. 
Saffordl, sp. nov., 
I, 218, 340 
O. 
subplanus, Conrad, 
I. 
256 
O. 
Scovillli, Miller, 
I, 222 
0. 
umbraoulum, P«cA, 
. I, 259, 
345 
0. 
sectosti-iata, 
I, 221 
Parastrophia Oreenii, sp. nov.. 
II, 222, 
3G7 
0. 
Semele, Hall, . 
I, 225 
P. 
divergens, sp. nov., . 
II, 222, 30G 
O. 
senecta, sp nov., 
I, 226 
P. 
latiplicata, sp. nov., . 
II, 222, 223, 
3G8 
0. 
sinuata. Hall, . 
I, 198, 212 
P. 
multiplicata, sp. nov.. 
II, 222, 223, 
367 
O. 
socialis, Barrande, . . 
I, 200 
Parazyga Deweyi, Hall, 
II, 128, 129, 
144 
0. 
solitai'ia Hall, . 
I, 225 
P. 
hirsuta, Plall, .... 
II, HI, 128, 
129 
O. 
spiriferoides, McCoy, 
I, 271 
Patella anomala, MUller,.... 
I, 122, 
150 
O. 
Stoiiensis, Safford, 
I, 224 
P. 
antiquu., Schlotheim, . 
I, 
158 
O. 
striaiella, Ualman, 
I, 191, 305 
P. 
implicata, Sowerby, 
I. 
158 
0. 
striatula, Schlotheim, . 
I, 213 
Pateriua Swantonensis, Walcott 
II, 
321 
0. 
strophomenoides, Hall, 
. I, 199, 223 
Paterula Bohemioa, Barrande, 
I, 
79 
0. 
subsequata, Conrad, 
I, 194, 207, 224 
Pentagonia Peersi, Cozzens, 
II, 
80 
0. 
subcarinata, Hall, 
I, 207, 224 
P. 
unisulcata, Conrad, 
II, 
81 
O. 
subelliptica, White and Whitfield, 
I, 225 
P. 
unisulcata, var. biplicata. Hall, 
II, 
81 
0. 
suborbicularis. Hall, . 
I, 225 
P. 
unisidcata, var. uniplicata. Hall, 
II. 
81 
0. 
subquadrata. Hall, . . I 
191, 196, 197, 311 
Pentamerella arala, Conrad, . 
II, 242, 
245 
O. 
superstcs, sp. nov., 
I, 217, 224 
P. 
dubia. Hall, .... 
II, 242, 
245 
0. 
Swallovi, Hall, 
I, 213, 226 
P. 
micula. Hall, .... 
II, 
245 
0. 
Sweeneyi, iV. H. Winchell, 
I, 196, 222, 228 
P 
obsolescens. Hall, 
. II, 
245 
0. 
testudinai'ia, Balman, I, 190, 191 
, 192, 205, 206, 207 
P. 
papilionensis. Hall, 
II. 
245 
217,218, 224 
P. 
Pavilionensis, Hall, 
II, 
245 
0. 
tetragona. 
I, 219 
Pentamerns Areyi, sp. nov., 
H, 242, 
243 
0. 
Thiemii, White, 
I, 225 
P. 
Aylesfordi, Sowerby, . 
II, 
236 
0. 
Tioga, Hall, 
I, 212, 226 
P. 
Barramlii, Billings, . ... 
II, 
244 
0. 
ti'icenaria, Conrad, 
I, 191, 193, 221 
P. 
Bashkiriciis, do Verneuil, 
II, 
235 
0. 
triplicatella, Meek, 
I, 194, 221 
P. 
bl.siuuatus, McChesney, 
II, 233, 
239 
0. 
Tntonia, Billings, 
I, 217, 232 
P. 
borealis, Eichwald, 
11, 234, 
240 
0. 
tubulostriata. Hall, 
I, 210, 225 
P. 
Collett i. Miller, . . . . 
II. 
235 
o. 
Tulliensis, Hall, 
I, 212, 226 
P. 
complamtus, Xettelroth, 
II, 
235 
o. 
uberis, Bdlings, 
I, 224 
P. 
crassicosia. Hall and Whitfield, 
II, 
235 
0. 
umbonata, Conrad, 
II, 55 
P. 
cylindricus. Hall, 
II, 237, 
238 
o. 
umhraculum, Schlotheim, 
I, 248, 256 
P. 
decussatus, Whiteaves, 
• II, 
235 
0. 
Vanuxemi, Hall. 
I, 225, 342 
P. 
elongatvs, Vanuxem, . 
II, 
252 
0. 
Vanuxemi, var. imlchella, Herrick, 
I, 225 
P. 
Esthonus, Eichwald, . 
II 
240 
6. 
varica, Conrad, . 
I, 204, 205, 223 
P. 
fornicatus. Hall, .... 
II, 242, 213, 
244 
0. 
Wangenheimi, de Verneuil, 
I, 319 
P. 
galealus, Balman, . . II, 
234, 242, 245, 
217 
o. 
Wisbj'ensis, Lindstraem, 
I, 207 
P. 
Knappi, Hall and AVhitfield, 
II. 
235 
o. 
Whitfieldi, N. H. Winchell, . 
I, 221 
P 
Knighti, Sowerby, 
II, 
236 
0. 
zonata, Dahnaii, 
I, 191 
P. 
Icevis, Sowerby, .... 
II, 
237 
0. 
(Dalmanellal arouaria, sp nov.. 
I, 341 
P 
laqueatus, Conrad, 
II, 
234 
0. 
(Dalmanclla) superstes, si), nov.. 
I, 34 2 
P. 
lens, Sowerby, . . . . 
. II, 
251 
o. 
(Flffisiomys) loricula, sp. nov.. 
I, 341 
P. 
lingvifer, Sowerby, . . II, 
242, 243, 244, 
245 
o. 
(Rhipidomolla) Oweni, sp. nov.. 
I, 3412 
P. 
Littoni, Hall, . . . . 
II, 
234 
o. 
(Schizophoria) senecta, sp. nov.. 
I, 343 
P. 
nobilis, Emmons, 
II, 
234 
Orthisuia adscendens^ Painlei*, . 
. I, 191, 237 
P. 
nucleus. Hall, .... 
II, 
247 
0. 
anomala, d'Orhigny, 
I, 237 
P. 
Nysius, Hall and AVhitfield, . 
II, 
235 
0. 
cava, Barrande, 
■I, 271 
P 
oblongus, Sowerby, I, 288; II, 
234, 237, 238, 
248 
o. 
crassa. Meek and Hayden, 
I, 262 
P. 
oblongus, var. Maquoketa, var. nov., . II, 
239 
0. 
festinata, Billings, 
I, 230 
P. 
oblongus, var. sirnrectus, var. nov.. 
II, 238, 239, 
240 
0. 
grandiEVa, Billings, 
I, 231 
P. 
occidentalis. Hall, 
II, 239, 240, 
248 
0. 
Missouriensis, Swallow, 
. I, 266 
P. 
pergibbosus, Hall and Whitfield, 
II, 239, 
240 
0. 
occidentalis, Xewberry, 
I, 266 
P. 
pseudobasnKtricus, Tschernyschew, . 
II. 
235 
0. 
orientalis, Whitfield, . 
I, 230 
P. 
pseiulogaleatus. Hall, 
II, 
242 
0. 
transversa, Walcott, 
I, 230 
P. 
reversus, Billings, 
II, 
222 
o. 
Verneuih, Eichwahl, 
. I, 231, 237 
P. 
Roemeri, sp. nov.. 
II, 
247 
Orthorhyncliula Lmneyi, Nettelroth, . 
II, 182, 337 
P. 
rotundatus, Sowerby, . 
II, 
223 
Orthostrophia strophomonoides, Hall, 
I, 200 
P 
Samojedicus, Keyserling, 
, II, 
240 
Orthothetes clesideratus, sp. nov., 
I, 345 
P. 
Sieberi, von Buch, 
II, 246, 
247 
