558 
INDEX. 
Modiomoi’pha affinis, Hall, 
alta, ( Conrad) Hall, 274, 276, 277, 3 78, 280,284, 
amygdalina, (Winehell) Hall, 291, 495, 496, 497, 
angustata, (Vanuxem) S. A. Miller, 
arcuata, Hall, ...... 
Catskillensis, Vanuxem,, 
Clarens, Hall, . 
coniplanata, Hall, 
concentrica, (Conrad) Hall 
cymbula, Hall, 
hyalea, Hall, 
hyalea. Hall, 
linguiformis, Hall, 
macilenta, Hall, 
mytiloides, Hall, 
M. 
Ml 
M. 
M. 
Iff. 
M. 
M. 
M. 
M. 
Ml 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M.? 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
Monomyaria, 
Monotis, 
374, 
. 273, 274, 279, 
xxiii, 270, 274, 276 , 3 7 7, 279, 
285, 
neglecta, Hall, 
perovata, (Meek $ Worthen ) Hall, 
perovata, Hall, 
planulata, Hall, . 
ponderosa, Hall, 
ponderosa, Hall, . 
putillus, Hall, . 
quadrula, Hall, 
recta, Hall, 
recurva, Hall, 
regularis, 
rigida, Hall, 
Schoharie, Hall, 
subalata, ( Conrad) Hall, 
subalata, var. Chemungensis, Hall, 
subangulata, Hall, 
Tioga, Hall, .... 
elevata, Conrad, 
Poulsoni, Conrad, 
princeps, Conrad, 
radians, (Conrad) S. A. Miller, 
arenacea, Hall, . 
attenuata. Hall, 
carinata, Hall, . . . . 
Chemungensis, ( Conr.) H . 257, 358,2E 
iibristriata, ( IVhite cf IVhitfield) Hall, 
gibbosa. Hall, 
lata, Hall, .... 
occidentalis, (1 Vhite <f Whitfield) Hall 
oviformis, (Conrad) Hall, 
ponderosa, Hall, . 
pyramidata, Hall, 
radiata, Hall, 
regularis, Hall, 
simplex, Hall, . . . , 
triqueter, (Conrad) Hall, 
umbonata, Hall, . 
(Plethomytilus) arenacea, Hall, . 
( P. ) cordiformis. Hall, 
(P. ) Knappi, Hall, 
(P. ) mytilimera, Conrad, . 
(P. ) ovata, Hall, 
(P. ) oviformis, Hall, 
M. 
M. 
M. 
M. 
Mya, 
MYTILARCA, Hall 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
M. 
PAGE. 
. 384 
285 
501 
516 
. 381 
516 
. 270, 373 
270, 37 3, 274 , 277 
xxiii, 3 75, 277, 281 
. 275, 383 
. 292,502, 503 
. 393 
282 
280 
280 
292 
. 271, 390 
272, 273, 274 
. 273 
277 
. 371 
271 
. 371 
389 
. 386 
388i 
. 370, 28" 
284, 38 7 
369, 270, 274, 275 
383 , 286, 287, 288, 28P|' 
384,288, 291 
387 
. 391, 29.3 
. . xvii 
. 425 
417, 425 
. 425 
Mytilarca (Plethomytilus) ponderosa, Hall, 
Mytilops, Hall, .... 
PAGE. 
. 354, 255 
(xlv) 262, 
M. ( Modiola ) lata. Hall, . 
M. (M. ) metella. Hall, . 
M. (M. ) prcecedens, Hall, . 
M. (M. ) simplex, Hall, . 
Mytilus, ....... 
M. Chemungensis, (Conrad) Phillips & Salter, 
M. fibristriatus, White & Whitfield, . 
M. occidentalis. White & Whitfield, 
M. Whitfieldianus, Winehell, 
Xeilo, .... 
Xucula, Lamarck, . xxvi, 
175, 
N. 
X. 
X. 
X. 
X. 
N. 
X. 
H. 
H. 
N. 
X. 
X. 
N. 
isr. 
N. 
X. 
X. 
N.l 
X. 
N. 
X. 
X. 
X. 
bellatula, Hall, 
xvii, xxviii, 313, 451 
333 
bellistriata, ( Conrad) Hall, 314,317, 3 18, 319,323, 333 
cingulata, Hisinger, 
corbuliformis, Hall, 
diffidens, Hall, 
globularis. Hall, 
Houghtoni, Stevens, 
Hubbardi, Winehell, 
Iowensis, Hall, 
Iowensis, White & Whitfield 
lamellata, Hall, 
levata, . 
lineata, Phillips, . 
lineatal (Phillips) Hall, 
lirata, ( Conrad) Hall, 
Neda, Hall $ Whitfield, 
niotiea. Hall <f Whitfield, 
oblonga, Hall, . 
Randalli, Hall, 
subelliptica. Hall, 
umbonata, Hall, 
varicosa, Hall, . 
(Xuculites) ovata, Sowerby, 
xxvi, 315 
vi, 
Xuculites, Conrad, 
, 4 
W. 
appressa, Conrad, . 
449 
. 422 
H. 
bellistriata, Conrad, . 
. 318 
XXX! 
H. 
Chemungensis. Conrad, . 
453 
1, 266 
V. 
constricta, Conrad, 
xxvii, 333 
253 
X. 
cuneiformis, Conrad, 
xxvi, 325 
. 360 
H. 
emarginata, Conrad, . 
. 338 
>, 261 
H. 
filosa, Conrad, 
343 
!, 264 
H. 
lirata, Conrad, 
. 316 
. 364 
H. 
maxima, Conrad, . 
335 
362 
X. 
Xyssa, 
. 327, 3 28 
. 262 
H. 
oblongata, Conrad, 
324 
, 264 
H. 
oblongata, (Conrad) Hall, 
. 324 
. 255 
X. 
oblongatus, Hall, . 
xxvi, xxvii, 324 
261 
1ST. 
radiata, Conrad, 
. 469 
. 256 
H. 
rostellata, Conrad, 
330 
252 
H. 
subemarginata, Conrad, 
. xlii, 464 
1, 263 
TV. 
sulcatina, Conrad, 
347, 348 
261 
X. 
triqueter, Conrad, 
xxvii, 326, 328 
. 265 
XYASSA, Hall, 
. xxlx, 352, 354, 358 
357 
X. 
arguta, Hall, 
xxix, 354, 357 
t, 254 
X. 
elliptica, Hall, 
. . 357 
254 
X. 
recta, Hall, 
. 355, 356 
. 356 
X. 
subalata, Hall, 
. xxix, 355 
254 
Orthis impressa, 
. 291 
. 254 
O. 
Tioga, 
496 
1, 265 
Orthonota, Conrad, . xxx, xxxi, xlii, xlv, 478, 482, 483 
267 
262 
268 
267 
261 
236 
258 
. 264 
263 
. 264 
xxviii 
359 
. 319 
333 
. 333 
333 
. 347 
323 
. 323 
xxvi, 330 
. 314 
316 
. 316 
315, 316, 321 
. 314 
313 
. 324 
317, 318, 322, 324 
. 317 
331 
318, 3 19. 320, 327 
325 
324 
xxvi, xlii, 
