ORTHOCERAS 
dentaloideum, 550 
dimidiatum, 314 
distans, 315 
ellipticum, 321 
filosum, 314 
Flemingi, 569 
fusiforme, 569 
Gesneri, 570 
giganteum, 571 
Ibex, 319 
Ibex, 406 
imbricatum, 315 
inequiseptum, 571 
laqueatum, 315 
laterale, 572 
(Uineolatum), 574 
Ludense, 315 
Mocktreense, 315 
ovale, 572 
paradoxicum, 573 
perelegans, 320 
politum, 316 
primeevum, 316 
pyriforme, 321 
pyriforme, 322 
rugosum, 573 
semipartitum, 316 
Sowerbyi, 573 
striatulum ? 406 
striatulum, 406 
striatum, 405 
striatum, 313 
subannulatum, 320 
subdimidiatum, 314 
subimbricatum, 572 
subundulatum, 317 
tenuiannulatum, 320 
tenuicinctum, 317 
tenuistriatum, 317 
tenuistriatum, 405 
tracheale, 321 
tubicinella, 406 
undatum, 574 
undulatum, 319, 573 
vagans, 318 
? ventricosum, 318 
virgatum, 313 
Orthoceratites striatus, 405 
subannulatus, 320 
substriatus, 313 
OrtTHONOTUS, 274 
cingulata, 280 
cymbzeformis, 274 
extrasulcata, 281 
inornata, 277 
nasutus, 275 
semisulcatus, 275 
triangulata, 280 
INDEX. 
Orthotrix, 387 
excavatus, 457 
lamellosus, 457 
OSTEOLEPIS, 587 
arenatus, 587 
brevis, 587 
macrolepidotus, 588 
major, 588 
microlepidotus, 588 
OsTEOPLAX, 613 
erosus, 613 
Ostreea ? pusilla, 492 
? Tayloriana, 492 
Pachyodon agrestis, 515 
amygdala, 515 
antiquus, 514 
Embletoni, 515 
exoletus, 514 
lateralis, 514 
levedensis, 514 
subtriangularis, 515 
transversus, 514 
turgidus, 516 
Pa&ciLopus, 638 
aliformis, 638 
foveolatus, 639 
Jonesii, 639 
obliquus, 640 
parallelus, 640 
subleevis, 640 
transversus, 639 
Palcade, 138 
Paleochorda major, Plate 1, A. 
minor, Plate 1, A. 
PALZONIscus, 605 
comptus, 606 
elegans, 605 
Freieslebeni, 606 
glaphyrus, 607 
macropthalmus, 607 
megacephalus, 606 
PaL#opora, 14 
? expatiata, 14 
? favosa, 15 
interstincta, 15 
var. subtubulata, 16 
megastoma, 16 
petalliformis, 17 
pyriformis, 67 
subtilis, 17 
tubulata, 18 
Paleothrissum, 605 
elegans, 605 
Freieslebeni, 606 
macrocephalum, 606 
magnum, 606 
Palastrzea carbonaria, 111 
PALLIOBRANCHIATA, 185 
PALUDINIDA, 302 
Pamphractus, 598 
PARADOXINA, 152 
Patella elliptica, 523 
implicata, 189 
PECTEN, 476 
Bathus, 478 
celatus, 483 
cancellatulus, 483 
concavus, 484 
concentrico-striatus, 484 
conoideus, 485 
deornatus, 478 
elongatus, 477 
? fimbriatus, 477 
Jlexuosus, 485 
granosus, 392, 486 
illegalis, 486 
inerassatus, 487 
intercostatus, 487 
interstitialis, 487 
mactatus, 487 
papyraceus, 488 
pera, 488 
plicatus, 486 
pusillus, 477 
segregatus, 489 
Sowerbyi, 478 
subelongatus, 477 
transversus, 393 
Pecten, 478 
PECTINIBRANCHIATA, 289 
PECTINID, 476 
Penniretepora, 48 
Lonsdalei, 49 
PENTAMERUS, 208 
Aylesfordi, 211 
brevirostris, 384 
carbonarius, 442 
galeatus, 208 
? globosus, 208 
Knighti, 209 
leevis, 208 
lens, 209 
microcamerus, 210 
oblongus, 211 
undatus, 211 
PENTREMITES, 123 
campanulatus, 123 
Derbiensis, 124 
ellipticus, 124 
PERIECHOCRINUS, 56 
costatus, 56 
moniliformis, 56 
PERISCHOECHINID&, 124 
PretTaLopus, 635 
acuminatus, 635 
dentatus, 626 
Hastingsii, 635 
