Neurism, 386 
Newberry, 370 
Nephriticeras, 531 
acreeum, 534 
bucinum, 533 
cavum, 534 
inelegans, 535 
juvenis, 532 
liratum, 532 
magister, 534 
maximum, 534 
oriens, 535 
subliratum, 532 
Notling, 506, 520 
Nostoceras, 566, 568, 569 
helicinum, 569, 570, 
573, 574, 614 
Stantoni, 569, 570 
tricostatus, 574 
Oncodoceras, 545 
Ontogenetic stages, 402 
Ontogeny, law in rela- 
tion to, 391, 407, 419 
Oonoceras, 447, 520 
Ophidioceras, 513, 
530, 601, 602 
rudens, 514 
tener, 517 
tessellatum, 518 
Origin of species, 419 
Orthoceras, 351, 361, 368, 
377, 400, 582 
elegans, 360 
unguis, 360 
Owen, Richard, 352, 359 
Oxynoticeras oxynotum, 
416 
514, 
Packard, 380, 388 
- Paleonautilus hospes, 488 
’ Palingenesis, law of, 390, 
401 
Paracme, 393, 395, 397, 
429 
Paragerontic, 
395 
Paraplasis, 391, 393, 394, 
395, 397, 398, 400 
382, 391, 
645 
Paranepionic, 391, 405, 
406, 416, 418, 445, 466 
471, 472, 477 
Paraneanic, 391, 409, 445, 
472 
Parephebic, 409, 472 
Patella, 380, 588 
Paterina, 364 
Peismoceras, 500 
angulatum, 500 
disjunctum, 500 
opatatum, 500 
placidum, 500 
Pelecypoda, 350, 
392, 396 
Periconch, 392 
Peripetoceras, 545 
Frieslebeni, 546 
Postembryonic, 392 
Phloioceras, 519 
gemmatum, 519 
Phragmoceras, 586 
perversum, 585 
subventricosum, 528 
Phrenism, 386 
Phylanaplasis, 397 
Phylembryonic, 397 
Phylogenesis, 397, 401 
Phylogerontic, 397, 410 
Phyloneanic, 397 
Phylometanepionic, 414 
Phylometaplasis, 397 
Phylonepionic, 397 
Phyloparaplasis, 397 
Phylephebic, 397 
Phylostages, 398 
Physical selections, 387 
Piloceras, 403, 404. 
Pinnacites, 412 
Planctoceras, 433, 446 
Quenstedi, 446 
Planorbis oequiumbilica- 
tus, 367 
Plasmology, 390 
Plectoceras, 499 
Bickmoreanus, 500 
Jason, 499 
obscurum, 499 
Pleuronautilus, 547 
superbus, 547, 591 
351, 
Podocoryne, 398 
Pompeckj, 607, 612, 613 
Potoceras, 537 
dubium, 537, 599 
Prodissoconch, 351, 392 
Prolecanites, 414 
Primordialidz, 413, 414, 
415 
Protegulum, 351, 364, 392 
Protoconch, 359, 373, 402, 
410, 412 
Protosiphonula, 403 
Protozoa, 394, 399 
Pselioceras, 530, 544 
ophioneum, 544 
Ptenoceras, 491 
alatum, 492 
flexum, 492 
tardum, 492 
Pteropoda, 360 
Ptychoceras, 
579 
crassum, 579, 580 
Texanum, 580 
Pycnoceras, 433, 454, 593, 
594 
apertum, 455 
calciferiforme, 456 
566, 570, 
Quenstedt, 356, 365, 375, 
376, 446, 566, 568 
Radical types, 378, 379 
Remelé, 446, 457, 458, 506, 
509, 511, 522 
Remeléceras, 520, 522 
Beyrichia, 512 
damesi, 512 
impressum, 522, 600 
Oelandicum, 512 
tenuistriatum, 512 
Zaddachi, 512 
Replacement, law of, 373 
Rhadinoceras, 530 
Hyatti, 531 
cornulum, 530 
Rhyncorthoceras, 511 
dubium, 512 
Rineceratidze, 543 
