INDEX OF GENERA. 



In addition to alphabetically indexing all the Palaeozoic genera in this work, and 

 placing in italics those which have been used but do not belong to North 

 America, the gender of each genus is designated as follows: to, for masculine; 

 /, for feminine ; n, for neuter. 



PAGE. 



Acambona,/ 332 



Acanthaspis, / 586 



Acantherpestes, m . . . 572 

 Acanthocladia, / . . . . 29L 

 Acanthoclema, n . . . . 291 



Acanthodes, m 586 



Acanthograptus, to . . . 170 



Acantholepis, / 586 



Acantholoma 525 



Acanthophyton, n . . . 104 

 Acanthotelson, n . . . . 525 



Acervularia, / 170 



Acheloma, n 617 



Acidaspis, / 526 



Aclis 395 



Aclisina, / 395 



Acondylacanthus, m . . 586 



Acrocrinus, m 216 



Acroculia 395 



Acrogenia, / 291 



Acrolepis, / 587 



Acrophyllum, n .... 170 



Acrothele, / 332 



Acrotreta, / .332 



Actinoceras, n 431 



Actinocrinus, m . . . . 216 



Actinod>sma, n 459 



Actinopteria, / 459 



Actinotrypa, / 291 



Adiphlebia,/. ..... 575 



jEgilops 332 



Aethophlebia, / 575 



Agaricia 170 



Agaricocrinus, m . . . . 220 



Agassichthys 587 



Agassizocrinus, m. . . .221 



Agassizodus, m 587 



Agelacrinus, m 221 



Aglaspis, / 526 



Agnostus, m 526 



Agraulus, to 527 



Alecto 291 



Alethopteris, / 104 



Allagecrinus, m 222 



Allocrinus, m 222 



Allocystites, m 222 



Alloprosallocrinus, m . . 222 

 Allorisma, n ..... . 459 



Alveolites, to 170 



Amacanthus, m 587 



Amblypterus, m . . . . 587 



Ambocoelia, / 

 Ambonychia, / 

 Ammonites . . 

 Amnigenia, /. 

 Auapheristocrinus, to 

 Amnylespes, to . . 

 Amphibamtis, m . 

 Amphicoelia, / . • 

 Amphide8ma . . . 

 Amphigenia, / . . 

 Amphion, to . . . 

 Amphipeltis, / . • 

 Ainpboracrinus, w 

 Amplexopora, / . 

 Amplexus, m.   

 Ampullaria .... 

 Ampyx, m . . . . 

 Amygdalocystites, in 

 Anaclitacanthus, to 

 Anarthrocanna, / . 

 Anastrophia, / 

 Anatina, / . . 

 Anazyga, / . . 

 Ancyrocrinus, m 

 Aneimites, m . 

 Angelina . . . 

 Angellum, n . 

 Anisodexis, m 

 Anisophyllum, n 

 Aoisotrypa,/ 

 Annularia, / 

 Anodontopsis, / 

 Anomocare . . . 

 Anonialocrinus, to 

 Anomalocystites, rn 

 Anomalodonta, / 

 Anomaloides   

 Anomia .... 

 Anomites .... 

 Anomphalus, to 

 Anopolenus, to . 

 Anthaspidella, / 

 Antholithes, m . 

 Anthophyllum, n 

 Anthracerpes, m 

 Anthracomartus, to 

 Anthracomya, / . 

 Anthraconectes, m 

 Anthracopalsemon, m 

 Anthracoptera, / 

 Anthracopupa, f 



332 

 460 

 432 

 461 

 223 

 572 

 618 

 461 

 461 

 333 

 527 

 528 

 223 

 291 

 171 

 396 

 528 

 223 

 587 

 105 

 333 

 461 

 334 

 223 

 105 

 528 

 462 

 618 

 172 

 292 

 105 

 462 

 528 

 223 

 224 

 462 

 224 

 334 

 334 

 396 

 528 

 153 

 106 

 172 

 572 

 570 

 462 

 528 

 529 

 463 

 396 



Antbracosia, / 

 Antliodus, m . 

 Aparchites, to 

 Apedodus, to . 

 Aphlebia, f   

 Apiocystites, to 

 Arabellites,. to 

 Arachrfocrinus, to 

 Aracbnopbyllum, n 

 Araucarites, m  . 



Area 



Arcbseobelus, w . 

 Archteocaris, / . . 

 Arch&>ocidaris, / . 

 Archseocrinus, m . 

 Arobseopteris, / 

 Arcliegogryllus, m 

 Archseocyatliellus, m 

 Archseocyathus, m 

 Archseoscolex, m 

 Arcbimedes, m 

 Archimedipora 

 Arcbimylacris, / 

 Arcbitarbus, n 

 Archiulus, to . 

 Arclinurui . . 

 Arenicolitep, to 

 Arelhwina . . 

 Arges, to . . . 

 Arionellus, m . 

 Aristophycw . 

 Aristozoe,/. . 

 Arthracantba, / 

 Arthraria,/ . 

 Arthroclema, n 

 Artbrolycosa,/ 

 Arthronema, n. 

 Artbrophycus, n 

 Arthropora, / 

 ATtbrostigma, n 

 Artbrostylus, m 

 Artisia, f   • 

 Asaphiscus, to 

 Aaaphoidichnus 

 Asaphus, m. . 

 Ascoceras, n . 

 Ascodictyon, n 

 Asolanus . . . 

 Aspidella, /. . 

 Aspidichthys, m 

 Aspidocrinus, to 



PAGE. 



. 463 

 . 587 

 . 529 

 . 587 

 . 106 

 . 224 

 .517 

 . 224 

 . 172 

 . 106 

 . 463 

 . 618 

 . 529 

 . 224 

 . 225 

 . 106 

 .575 

 . 154 

 . 154 

 . 572 

 . 292 

 . 292 

 . 575 

 . 570 

 .573 

 . 530 

 . 517 

 . 530 

 . 530 

 .530 

 . 106 

 . 530 

 . 225 

 . 107 

 . 293 

 . 570 

 . 293 

 . 107 

 . 293 

 . 107 

 . 293 

 . 107 

 . 530 

 . 530 

 .530 

 . 432 

 . 293 

 . 107 

 . 389 

 . 587 

 . 225 



655 



