694 
Apheleceras, 523 
Aphetoceras, 519 
Aphragmites, 516 
Aphyllites, 549 
Aplysias, 487 
Apioceras, 530 
Apiecystites, 187 
Apleuroceras, 556 
Aploceras, 527 
Aplococeras, 556 
Aplodon, 375 
Aplustrum, 486 
Apochrysa, 685 
Aporrhais, 470 
Apricardia, 400 
Apsendesia, 264 
Apsorroceras, 584 
Aptychopsis, 658 
Aptyxiella, 467 
Aptyxis, 467 
Apus, 641 
Arachnocrinus, 156 
Arachnocystites, 184 
Arachnoides, 238 
Araeacis, 85 
Araeosternus, 663 
Arbacia, 231 
Arbusculites, 317 
Area, 366 
Arcestes, 565 
Archaediseus, 32 
Archaeocarabus, 663 
Archaeocaris, 659 
Archaeocidaris, 220 
Archaeocrinus, 145 
Archaeolepas, 650 
Archaeoniscus, 668 
Archaeoplax, 667 
Archaeoscyphia, 48 
Archaeosphaerina, 35 
Archaeozonites, 497 
Archasterias, 207 
Archidesmus, 681 
Archimedes, 282 
Architarbus, 679 
Arcicardium, 413 
Arcomya, 389 
Arcomyopsis, 361 
Arcopagia, 417 
Arctica, 395 
Arctoceras, 559 
Arenicola, 256 
Arethusina, 631 
Argas, 657 
Arges, 632 
Argina, 366 
Argiope, 330 
Argonauta, 603 
Argopatagus, 248 
Arietes, 575 
Arieticeras, 576 
Arioliamax, 498 
Arion, 498 
Ariophanta, 497 
Aristella, 385 
Aristocystites, 182 
Aristozoe, 656 
Arnioceltites, 557 
Arnioceras, 575 
Arniotites, 558 
Arpadites, 560 
Arrhoges, 471 
Artemis, 415 
Arthrocantha, 140 
Arthroclema, 281 
Arthrolycosa, 679 
Arthropleura, 668 
Arthropora, 279 
Arthrostylus, 280 
Asaphis, 418 
Asaphus, 629 
Ascoceras, 516 
Aspergillum, 391 
Aspidiseus, 88 
Aspidites, 556 
Aspidocaris, 658 

TEXT-BOOK OF PALAEONTOLOGY 
Aspidoceras, 582 
Aspidophyllum, 
Aspidopora, 273 
Aspidosoma, 207 
Aspidura, 204 
Assilina, 33 
Assiminea, 464 
Astacus, 664 
Astarte, 395 
Astartella, 394 
Asteractinella, 56 
Asteroblastus, 188 
Asteroceras, 575 
Asterodaspis, 238 
Asthenodonta, 374 
Asthenosoma, 226 
Asthenothaerus, 390 
Astieria, 583 
Astraeomorpha, 94 
Astraeopora, 95 
Astraeospongia, 56 
Astralium, 448 
Astrangia, 86 
Astrocladia, 49 
Astrocoenia, 90 
Astroconia, 55 
Astrocrinus, 198 
Astrohelia, 84 
Astroides, 93 
Astropecten, 208 
78 
| Astropyga, 230 
Astrorhiza, 23 
Astylocrinus, 162 
Astylomanon, 50 
Astylospongia, 50 
Asymptoceras, 525 
Atactodea, 421 
Atactopora, 278 
Atactoporella, 272 
Ataxioceras, 581 
Atelecrinus, 175 
Atelestocrinus, 158 
Atergatis, 666 
Athleta, 480 
Athyris, 338 
Atlanta, 455 
Atoma, 483 
Atomodesma, 372 
Atops, 627 
Atractites, 595 
Atretia, 325 
Atrina, 369 
Atrypa, 334 
Atrypina, .334 
Aturia, 522 
Atys, 487 
Aucella, 372 
Aulacoceras, 595 
Awacophylum, 76 
Aulacorhynchus, 318 
| Aulacostephanus, 583 
Aulacothyris, 332 
Aulocopium, 47 
Aulonotreta, 306 
Aulophyllum, 78 
Aulopora, 101 
Aulosteges, 317 
Auricula, 493 
Aurigerus, 582 
Aurinia, 480 
Austriella, 324 
Autodetus, 463 
Avellana, 486 
Avicula, 370 
Aviculopecten, 380 
Aviculopinna, 369 
Axined, 366 
Axinopsis, 410 
Axinus, 410 
Axosmilia, 89 
Azara, 422 
Azeca, 496 
Babinka, 867 
| Bactrites, 549 
Bactropora, 281 
Bactropus, 656 
Bactrotheca, 491 
Bactrynium, 316 
Baculina, 584 
Baculites, 571 
Badiotites, 556 
Baerocrinus, 152 
Bairdia, 646 
Bakewellia, 369 
Balanocrinus, 174 
Balanocystites, 186 
Balanophyliia, 93 
Balantium, 489 
Balanus, 651 
Balatonites, 559 
Baltoceras, 517 
| Bambaganites, 561 
Barbarothea, 689 
Barbatia, 366 
Baroda, 416 
Barrandeites, 554 
Barrandella, 322 
Barrandeoceras, 519 
| Barrandeocrinus, 144 
Barrettia, 406 
| Barroisella, 307 
Barroisia, 65 
Barroisiceras, 588 
Bartlettia, 378 
Barycrinus, 157 
| Baryphyliia, 88 

| Baryphyllum, 74 
Barysmilia, 90 
Basterotia, 392 
Bathmoceras, 517 
Bathybius, 18 
Bathycyathus, 84 
Bathynotus, 627 
Batillus, 448 
Batissa, 397 
Batocrinus, 142 
Batostoma, 275 
Batostomella, 277 
Battersbyia, 79 
Bayania, 456 
Bayanoteuthis, 598 
Baylea, 443 
Bayleia, 401 
Beachia, 326 
Becksia, 61 
Beecheria, 328 
Bela, 482 
Belemnitella, 597 
Belemnites, 596 
Belemnopsis, 597 
Belemnosis, 598 
Belemnoteuthis, 599 
Belgrandia, 464 
Belinurus, 671 
Bellardia, 469 
Bellerophon, 445 
Beloceras, 554 
Beloptera, 598 
Belopterina, 598 
Belosepia, 601 
Beloteuthis, 602 
Beneckia, 554 
| Berenicea, 261 
Berytopsis, 687 
Beyrichia, 644 
| Beyrichites, 556 
_ Biradiolites, 403 
Bdellacoma, 207 
Bicavea, 264 
Bicrisina, 262 
Bidiastopora, 261 
Bifida, 338 
Bifrontia, 458 
Bigenerina, 28 
Billingsella, 312 
Billingsia, 806 
Billingsites, 516 
Bilobites, 319 
Biloculina, 26 
Binkhorstia, 665 

Birostrites, 405 
Bisidmonea, 262 
Bittium, 469 
| Bittnerula, 335 
Blabera, 684 
Blaculla, 661 
Blanchardia, 684 
| Blattidium, 684 
Blauneria, 493 
Boletia, 233 
Bolivina, 28 
Bollia, 644 
Bolma, 448 
Bontaea, 390 
Borelis, 26 
Borsonia, 483 
Boskovicia, 463 
Bosnites, 560 
Bosquetia, 646 
Bostrichopus, 668 
Bostrychoceras, 5$8 
Bothriocidaris, 219 
Bothrocorbula, 422 
Botriopygus, 240 
Botryllopora, 270 
Botryocrinus, 157 
Botsfordia, 306 
Bouchardia, 333 
Bourgetia, 456 
Brachiospongia, 55 
Brachtrema, 458 
Brachymerus, 326 
| Brachyprion, 313 
| Brachypyge, 679 
Brachythyris, 335 
Brachytreia, 459 
Branchipodites, 641 
Brancoceras, 552, 590 
Brasilia, 576 
Brechites, 391 
| Breynia, 247 
Brilonella, 443 
Brissomorpha, 247 
Brissopatagus, 247 
Brissopsis, 247 
Brissus, 247 
Brocchia, 460 
Brodia, 684 
| Brodieia, 576 
Broeckia, 362 
Bronteus, 632 
Bryograptus, 114 
Bryopa, 391 
Bueania, 445 
Buccinopsis, 476 
Buceinulus, 484 
Buecinum, 475 
Buchiceras, 590 
Buchiola, 362 
Buchites, 560 
Buddhaites, 557 
Bulimina, 28 
Buliminus, 496 
Bulimulus, 495 
Bulla, 487 
Bullaea, 487 
Bullina, 485 
Bullinella, 487 
Bullinula, 485 
Bundenbachia, 203 
Bunodella, 673 
Bunodes, 672 
Buria, 660 
Bursacrinus, 160 
Bushia, 890 
Buskia, 264 
Buskopora, 270 
Busycon, 477 
| Bylgia, 661 
Byssocardium, 413 
Byssomya, 422 
| Byssonychia, 368 
Byssopteria, 368 
Bythinella, 464 
Bythinia, 464 
Bythocypris, 646 
Bythopora, 277 
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