INDEX OF GENERA. 



In addition to indexing the Genera in this work, the gender of each genus is 

 . designated — m, for masculine ; /, feminine ; n, neuter. The importance of this work will 

 not be overestimated, and the author feels confident of its accuracy, inasmuch as it has 

 been carefully examined by Prof. Claypole, of Antioch College. 



PAGE. 



Acambona, / 103 



Acanthaspis, /. 227 



Acantholepis, / 227 



AcanihoHoma 208 



Acanthophyton, n 21 



Acanthotelson, n 208 



Acervularia, /. 46 



* Acidaspis,/. 208 



Aclis,/. 143 



Acondylacanthus, m 227 



Acrocrinus, TO 66 



AcrocMlia 143 



Acrolepis, /. 227 



Acrophyllum, n 46 



Acrotreta,/. 103 



Actinoceras, n 16" 



Actinocrinus, m 66 



Actinodesma, n 180 



Aegilops, m 103 



AgaruAa 46 



Agaricocrinus, m 69 



Agassichthys 227 



Agassizocrinus, m 69 



Agassizodus, m 228 



Agelacrinus, m 69 



Aglaspis, / 209 



Agnostus, TO 209 



Agraulos, m 209 



-»-Alecto,/ 95 



Alethopteris, ^. 21 



AUoprosallocrinus, m 70 



Allorisma, n 180 



Alveolites,?™ 46 



Amacanthus, m 228 



Amblypterus, m 228 



Ambocoelia, /. 103 



Ambonychia, /. 181 



Amphibamus, m 240 



Amphicoelia, / 181 



Amphigenia, /. 104 



Amphion, m 209 



Amphipeltis, /• 209 



Amphoracrinus, m 70 



Amplexus, to 46-243 



AmpuUaria 143 



Ampyx, m 209 



Amygdalocystites, m 70 



Atiaclitacanthus, to 228 



Anarthrocanna,/ 22 



Anastrophia, /. 104 



Anatina, /. 181 



Ancyrocrinus, TO 70 



AneimiteSjTO 22 



Annularia, /. 22 



Anodontopsis, /. 182 



Anomalocrinus, m 70 



Anomalocystites, m 70 



Anomalodonta, / 182 



Ancrmia 104 



Anomites 104 



Anomphalus, m 143 



Anopolenus, m 209 



Antholithes, m - 22 



Anthophyllum, n 46 



Anthracerpes, m 224 



Anthracomya, /. 182 



Anrhraeonectes, m 209 



Anthracopalsfimon, m 210 



Anthracoptera, / 182 



Anthracosia, /. 182 



Antliodus, m 228 



Apedodus, m 228 



Apiocystites, m 70 



Araucarites,m 22 



Area 182 



Archaeocaris, / 210 



Archaeocidaris, /. 70 



Archaeopteris, /. 22 



Archegogryllus, m 225 



Archaeocyathus, m 42 



Archimedes, m 95 



Archimedipora 95 



Archimylacris,/. 225 



Arcbitarbus, n 224 



Archiulus, m 224 



Arenicolites, m 206 



Arges, TO 210 



Arionellus, to 210 



Arthraria, /. 22 



Arthroclema, n 95 



Arthrolycosa,/ 224 



Arthrophycus, n 23 



PAGE 



Arthrostigma, n 23 



Artisia,/. 23 



Asaphiscus 210 



Asaphus, TO 210 



Ascoceras, n 165 



Aspidella, /. 141 



Aspidichthys, m 228 



Aspidocrinus, m 71 



Aspidodus, TO 228 



Asplenites, to 23 



Astarte,/. 182 



Astartella,/. 182 



Asteracanthus, m 228 



Asterias 71 



Asterocarpus, m 23 



Asterocrinus 71 



Asterophycus, n 23 



Asterophyllites, m 23 



Asteroptychius, m 228 



Asterosteus, m 228 



Astrsea 46 



Astrseospongia, / 42 



Astrios 71 



Astrocerium, n 47 



Astrocrinites 71 



Astylospongia, /. 42 



Ataxwrinus 71 



Ateleocystites, m 71 



Athyris,/. 104 



AUrpa 211 



Atrypa, /. 105 



Aulocopina, /. 42 



Aulophyllum, n 47 



fAulopora,/ 47-64 



Aulosteges, m 106 



^Avicula,/. 182 



Aviculopecten, to 184 



Aviculopinna, /. 185 



Axinura 47 



Aximts 185 



Axophyllum, n 47-64 



Bakevellia, / 185 



Balanocrinus 71 



Baphetes.m 240 



Barrandia 211 



Barycrinus, m, 71 



