INDEX. 
385 
PAGE, 
PAGE, 
Notothyi-is subvescicularis, Davidson, 
n. 
274 
Orbiculoidea Forbesi, Davidson, . 
1,116, 125, 126, 129, 135, 
160 
Nucleospu'a Bai'i'isi, White and Whitfield 
II, 
145 
0. 
grandis, Vanuxem, 
I, 
133 
N. 
concenlrica. Hall, 
II, 
145 
O. 
Herzeri, sp. nov.. 
I, 
178 
N. 
concinna, Hall, 
n. 
145 
0. 
Morrisi, Davidson, 
. I, 133, 
160 
N. 
elegans, Hall, . ' . 
II, 
145 
o. 
Newberryi, HaK, 
I, 
130 
N. 
pisiformis, Hall, 
II, 
145 
0. 
nitida, Phillips, 
I, 
136 
N. 
pisum, Sowerby, 
H, 
145 
o. 
numulus, sp. nov.. 
I, 
178 
N 
rotunda, Whitfield, 
II, 
145 
0. 
Eandalli, Hall, 
I, 
133 
n! 
ventricosa, Hail, 
II, 
145 
0. 
tenuilamellata. Hall, 
. 1,127, 
135 
X.’ 
sp. ? . . . . 
II, 
146 
0. 
(Boemerella) grandis, Vanuxem, . . I, 
178 
Numulus BrattensburgensiSy Stoboeus, . 
I. 
150 
0. 
(Schizotreta) ovalis, sp. nov., . . I, 
179 
Obolella atlantica, Walcotty 
I, 
69 
Oriskania navicella, sp. nov.. 
II, 269, 
270 
o. ? 
ambigua, Walcott, 
. 1,69, 
78 
Orthamboniles transversa. Pander, 
I, 
237 
o. 
Bel ti, Davidson, 
I, 
68 
Orthis acutiloba, llingueberg. 
I, 
205 
0. 
ccdata. Hall, 
I, 
69 
0. 
acutilirata, Conrad, 
I, 
223 
o. 
chromatica, Billings, . I, 67, 63, 69, 
70, 72, 73, 75, 
76 
O. 
a:quivalvis. Hall, 
I, 194, 
221 
78, 
91 
0. 
alternata, Sowerby, 
I, 
203 
o. 
cingulata, Billings, 
. 1,69, 
91 
0. 
alsa, Plall, 
I, 
225 
0. 
(Jirce, Billings, . . . . 
. 1,68, 
69 
0. ? 
apicalis, Billings, 
I, 217, 
240 
0. 
crassa. Hall, . . I, 67, 68,69, 
70, 71, 72, 75, 
78 
0. 
arachnoidea, Pliillips . 
I, 
256 
o. 
desiderata, Billings, 
I, 57, 69, 
75 
0. 
arcuaria, sp. nov.. 
I, 
224 
0. 
desquamata. Hall, 
I, 
68 
0. 
Armanda, Billings, 
. I, 217; II, 
214 
o. ? 
discoidca. Hall and Whitfield, 
I, 
69 
0. 
assimilis. Hall, . , 
I, 
224 
0. 
gemma, Billings, 
I, 68, 69, 70, 
71 
o. 
Aurelia, Billings, 
I, 
221 
0. ? 
Ida, Billings, . . . . 
I. 
69 
o. 
Aymara, Salter, 
II, 
137 
o. 
maculata, Hicks, 
■ 1.68, 
109 
0. 
Barabuensis, A. Winchell, 
H, 
212 
0. 
miser a, Billings, 
I, 
69 
0. 
basalis. Dolman, 
. I. 191,192, 
207 
o. 
nana, Meek and Hayden, 
. I, 69, 
70 
0. 
Battis, Billings, 
I,^ 
222 
0. 
nitida, Ford, .... 
. 1,69, 
70 
0. 
Baylii, Rouault, 
I, 
213 
o. 
Bhillipsi, Holl, 
I, 
94 
0. 
bellarugosa. Hall, 
I, 
222 
o. 
polita. Hall, . . .1,68, 
69, 70, 72, 73, 
83 
0. 
bellula, James, . 
I, 
224 
o. 
pretiosa, Billings, 
I, 
70 
0. 
biforata, von Schlotheim, 
. I, 100, 200, 
223 
0. 
Sabrina;, Callaway, 
. I. 68, 
103 
0. 
Billingsi, Hartt, 
I, 
232 
o. 
sagittalis, Salter, 
I, 68, 107, 
108 
0. 
Billingsi, SalTord, 
.1, 
219 
0. 
transversa, Ilartt, 
■ 1,70, 
107 
0. 
biloba, Linn'e, 
. I, 190, 304, 205, 
223 
Obolus advena, Barrande, 
. 1,68, 
69 
o. 
bistdeata, Emmons, 
II, 
146 
0. 
antiquissimus, von Eichwald, 
I, 
82 
0. 
borealis, Billings, 
I, 
222 
0. 
AlJOllinis, von Eichwald, 
I, 51, 80, 82, 
339 
0. 
Bouohardi, Davidson, . 
I, 
217 
0. 
Appolinus, Owen, 
I, 
72 
0. 
Burlingtonensis, Hall, 
I, 
225 
0. ? 
Bohemicus, Barrande, . 
I, 
101 
0. 
callactis, Dalman, I, 191, 192, 195, 196, 228; II, 
133 
O ? 
complexus, Barrande, . 
. 1,68, 
73 
338, 
340 
O. 
ingricus, von Eichwald, 
I. 
82 
0. 
calligramma, Dhltnan, 
I, 190, 191, 192, 193, 194, 
195 
0. 
leibradoricus, Billings, . 
I, 94 ; H, 
321 
219, 231, 238, 242, 
244 
0. 
pulcher, Matthew, 
. 1,81, 
183 
o. 
calligramma, var. Davidsoni, de Verneuil, I, 193, 
227 
0. 
Quenstedti, Mickwitz, 
I, 
339 
0. 
calligramma^ Jlabellites 
Foerste, . I, 
228 
0. 
silui’icus, von Eichwald, 
I, 
82 
o. 
calligramma.^ var. orthamboniles y Billings, . I, 
221 
(Ehlertella pleurites, Meek, 
• I, 144, 
169 
0. 
carinata. Hall, 
I, 213, 
226 
Oldhamina decipiens, de Koninck, 
II, 
314 
o. 
circularis, Roemer, 
I, 
259 
Orbicula antiquissima, von Eichwald, . 
I, 118, 119, 
140 
0. 
circulus. Hall, . 
I, 210, 
224 
0. 
Buchi, de Verneuil, 
. 1,151, 
152 
0. 
Clarkensis, Sivallow, . 
I, 
225 
0. 
ccdata. Hall, .... 
I, 
69 
o. 
Cleobis, Hall, 
I, 
225 
0. 
crassa. Hall, .... 
I, 
72 
0. 
Clytie, Hall, 
. I, 202, 203, 
223 
0. 
de/ormata. Hall, .... 
I, 
150 
0. 
concinna. Hall, 
I, 207, 
224 
0. 
Morrisi, Davidson, . . I, 
128,129, 130, 
160 
0. 
coral Una, Waagen, 
I, 
210 
0. 
norvegica, Sowerby, 
I, 
121 
0. 
Corinna, Billings, 
I, 
217 
0. 
norvegica, Lamarck, . . , 
I, 
122 
o. 
costalis. Hall, . 
. I, 221, 227, 228; H, 
340 
O. 
punctata, Sowerby, 
I. 
140 
0. 
crassa, Meek, 
I, 
223 
O. 
reversa, de Verneuil, 
• I. 
118 
0. 
crenistria. Philips, 
I, 
248 
O. ? 
squamiformis,Via,\\, 
I, 
159 
o. 
orispata, Emmons, 
I, 
224 
O. 
terminalis, Emmons, . 
I, 
140 
0. 
Cumbei'landia, Hall, . 
I, 
225 
Orbiculoidea, sp. ? Meek, 
I, 
127 
0. 
cuneata, Owen, . 
I, 
225 
O. 
conica, Dwight, . . .1, 116, 
124, 126, 129, 
135 
0 
cvclas, Hall, 
I, 
225 
0. 
Davidsoni, d’Orbigny, . 
I, 
160 
o. 
cylindrica, McCoy, . 
I, 
262 
