ALPHABETICAL LIST OF GENERA. 



Page. 



Acacocrinus 1413 



Acanthoclema 1416 



Acanthodictya 1408 



Acanthograptus 1410 



Acantholenus 1424 



Acanthonema 1421 



Acervularia 1408 



Achradocrinus 1414 



Acidaspis 1424 



Acrothele 1417 



Acrotreta 1417 



Actinoceras (subgenera Deiroceras 



and Paractinoceras) 1423 



Actinodictyon. 1409 



Actinopteria. , 1419 



Actinostroma 1409 



2Echmina 1425 



JEsiocystites 1412 



^thocystites 1412 



Agelacrinites 1412 



Agnostus 1423 



Alepidaster 1414 



Allocrinus 1412 



Allocystites 1411 



Allodesma 1420 



Allonema 1415 



Allonychia 1419 



Alveolites 1409 



Ambonycliia 1419 



Ampheristocrinus 1414 



Amphicoelia 1419 



Amphigraptus 1410 



Ampliilichas 1424 



Amplexopora 1416 



Amplexus 1408 



Ampyx (subgenus Lonchodomas) . 1424 



Amygdalocystites 1411 



Anabaia 1419 



Anacheirurua 1425 



Anaphragma 1416 



Anastrophia 1418 



Ancistroceras 1423 



Anisocrinus 1413 



Anisophyllum 1408 



Page. 



Anodontopsis 1420 



Anolotichia 1415 



Anomalocrinus 1413 



Anomalocystites 1411 



Anomalodonta 1419 



Anomaloides 1408 



Anomocare 1425 



Anomocarella 1425 



Anomoclonella 1407 



Anoptera 1419 



Anorthaster 1414 



Anthaspidella 1407 



Aparchites 1425 



Apatokephalus 1424 



Aphetoceras 1422 



Aphyllostylus 1408 



Apiocystites 1411 



Apsidoceras 1422 



Arabellites 1410 



Archseocrinus 1412 



Archeeoscyphia 1407 



Archinacella 1420 



Arctinurus . 1424 



Arenicolites 1411 



Arionellus 1425 



Aristerella 1420 



Aristozoe 1425 



Arthraria 1427 



Arthroclema 1416 



Arthrophycus 1411 



Artliropora 1416 



Arthrorhachis 1423 



Arthrostylus 1416 



Asaphellus 1424 



Asaphocrinus 1413 



Asaphoidichnus 1411 



Asaphus 1424 



Ascoceras 1422 



Ascodictyon 1415 



Aspidopora 1415 



Astraeospongia 1408 



Astraspis 1426 



Astroconia 1408 



Astrocystites 1412 



^The page number refers to the biological classification. 



1429 



