INDEX. 
363 
Obolella maculata, Hicks, . 
misera, Billings, 
nana, Meek and Hayden, 
nitida, Ford, . 
Phiilipsi, Holl, 
polila, Hall, 
M pretiosa , Billings, 
Sabrinas, Callaway, . 
sagittalis, Salter, 
transversa, Hartt, 
Obolus advena, Barrande, 
antiquissimus, von Eichwald, 
Apollinis, von Eichwald, 
Appolinus, Owen, 
Bohemicus, Barrande, 
complexus, Barrande, 
ingricus, von Eichwald, 
Labradoricus, Billings, 
pulcher, Matthew, 
Quenstedti, Mickwitz, 
siluricus, von Eichwald, 
CEhlertella pleurites, Meek, . 
Orbicula antiquissima, von Eichwald, 
Buchi, de Yerneuil, . 
ccelata, Hall, 
crassa, Hall, . 
deformata, Hall, . 
Morrisi, Davidson, . 
norvegica, Sowerby, 
norvegica, Lamarck, 
punctata, Sowerby, 
reversa, de Yerneuil, 
squami/ormis, Hall, 
terminalis, Emmons, 
)rbiculoidea, sp. ? Meek, 
conica, Dwight, 
Davidsoni, d’Orbigny, 
Forbesi, Davidson, 
grandis, Vanuxem, 
Herzeri, sp. nov. 
Morrisi, Davidson, 
Newberryi, Hall, 
nitida, Phillips, 
numulus, sp. nov. 
Randalli, Hall, 
tenuilamelluta, Hall, 
(Roemerella) grandis, Vanuxen 
O. (Schizotreta) ovalis, sp. no' 
Orthambonites transversa, Pander, 
Orlhis acutiloba, Ringueberg, 
acutilirata, Conrad, 
aequivalvis, Hall, 
alternata,. . 
alsa, Hall, 
apicalis, Billings, 
arachnoidea, Phillips, 
arcuaria, sp. nov., 
Armanda, Billings, 
assimilis, Hall, 
Aurelia, Billings, 
basalis, Dalman, . 
Battis, Billings, 
Baylii, Rouault, 
bellarugosa, Hall, 
70, 72, 73 
68 
I, 107 
this bellula, James, .... 
biforata, von Schlotheim, . 190 
Billingsi, Hartt, .... 
Billingsi, Safford, .... 
biloba, Linne, 190, 204 
borealis, Billings, .... 
Bouchardi, Davidson, 
Burlingtonensis, Hall, 
callactis, Dalman, . 191, 192, li)"> 
calligramma, Dalman, 190,191, 192, 193,191 
231, 238 
calligramma, var. Davidsoni, de Yerneuil 
calligramma, var. flabellites, Foerste, 
calligramma, var. orthambonites, Billings, 
carinata, Hall, 
circularis, 
circulus, Hall, 
Clarkensis, Swallow, 
Cleobis, Hall, 
Clytie, Hall, 
concinna, Hall, 
corallina, Waagen, 
Corinna, Billings, 
costalis, Hall, . 
crenistria, Phillips, 
crispata, Emmons, 
Cumberlandia, Hall, 
cuneata, Owen, 
cyclas, Hall, 
cylindrica, . 
Dalyana, Miller, 
Davidsoni, de Yerneuil, 
Daytonensis, Foerste, 
deflecta, Conrad, . 
deformis, Hall, 
demissa, 
Derbyi, Waagen, 
Deshayesi, . 
dichotoma, Hall, 
discus, Hall, 
disparilis, Conrad, 
dubia, Hall, 
electra, Billings, 
elegans, Bouchard, 
elegantula, Dalman, 
elegantula, var. parv; 
Ella, Hall, 
emacerata, Hall, . 
eminens, Hall, 
Eurekensis, Walcott, 
Euryone, Billings, 
Evadne, Billings, 
excavata, Geinitz, 
eximia, de Verneuil, 
expansa, Sowerby, 
extensa, Pander, . 
fasciata. Hall, . 
fausta, Foerste, 
fissicosta, Hall, 
flabellites, Hall, * . 
flabellulum, Hall, 
flabellulum, Sowerby, 
gemmicula, Billings, 
