340 
ALPHABETICAL INDEX. 
Meloceras 
arcticameratum, 288. 
Barrandei, 302. 
Beaumonti, 290. 
Belgicum, 305. 
centrifugum, 271. 
cinctum, 313. 
clathratum, 303. 
clavulus, 274. 
cognatum^ 299. 
compressum, 272. 
corbulatum, 274. 
corniculum, 276. 
cornu, 306. 
cycloideum, 277. 
cyclostomum, 277. 
debile, 291. 
decipiens, 285. 
elongatum, 278. 
expandens, 292. 
extricatum, 298. 
falx, 270. 
forte, 292. 
fraternum, 278. 
hybrida, 293. 
imperiale, 279. 
insociale, 294. 
intermedium, 285. 
isca, 273. 
M'Coyi, 303. 
mimdum, 301. 
Murcbisoni, 294. 
neutrum, 289. 
nuntius, 280. 
obesum, 286. 
ornatum, 309. 
parvulum, 296. 
pergratum, 300. 
plebeium, 280. 
prsecox, 270. 
problematicum, 281. 
quasi-rectum, 295. 
rugosu.m, 308. 
Bcalpratum, 312. 
sericarius, 287. 
Bociale, 282. 
subplicatum, 305. 
Bubrugosum, 306. 
tardum, 283. 
urbanum, 301. 
yelox, 28^ 
verna, 288. 
Yerneuilianum, 308. 
virgula, 297. 
sp., 305. 
Mesoceras, 244. 
Molossus, 1. 
Nelimenia incognita^ 258. 
Notkoceras, 129. 
Numimilaria, 164. 
Oncocems, 256. 
constricturn, 258. 
Ooceras, s. g. {sec Cyrtoceras), 312. 
acinaces, 314. 
aequale, 315. 
approximatum, 313. 
falcatum, 312. 
flexuosnm, 316. 
superbum, 316. 
Oonoceras, 262. 
Ormoceraf<, 164. 
Bac/ci, 182. 
Bayfieldi, 185. 
crebrisepturn, 173. 
Lyonii, 168. 
remotiseptum, 172. 
tenuifilum, 168. 
vert ebrat urn, 185. 
Whitei, 184. 
Orthocera, 256, 262. 
annidata, 53. 
Breynii, 191. 
cincta, 106. 
cordiformis, 26(1. 
cylindracea, 102. 
elegans, 127. 
eUipticum, 321. 
fusiformis, 259, 306. 
Gcsneri, 114. 
gygantea, 187. 
IcBvis, 120. 
pyramidalis, 103. 
riigosa, 308. 
striata, 190. 
striolata, 125. 
sulcata, 108. 
undata, 108. 
undulata, 191. 
Orthoceras, 1, 319. 
acuarium, 43, 97. 
affine, 103. 
amabile, 104. 
amoenum, 47. 
anceps, 119, 324. 
angidare, 109. 
angulatum, 69. 
anguJatum, 66, 68. 
angustiseptatum, 96. 
annellatum, 13. 
anmdatum, 53, 336. 
annulatum, var. Americanum, 
56. 
, Tar. crassum, 55. 
, var. fimbriatum, 57. 
, var. perundosum, 56. 
, var. subtile, 58. 
annulatum, 55, 57, 107, 108. 
{Cycloceras) annulatum, 55. 
aperiens, 42. 
approximatum, 313. 
araneosum, 45. 
