INDEX TO THE GENERA. 
Acanthocladia, 44 
Acanthopyge, 17 
Acervularia, 14 
Acrocoila, 121 
Acroculia, 80 
Acton, 113, 159 
Actinocrinus, 14, 40 
Actinocyathus, 14 
Adiantides, 29 
Adiantites, 29 
Aganides, 89 
Alethopteris, 29 
Allorisma, 62 
Alveolites, 10, 33 
Alyssites, 12 
Ammonites, 115, 117 
Amphelia, 133 
Amphihelia, 133 
Amphistegina, 125 
Amplexus, 33 
Anarthrocanna, 95 
Ancilla, 159 
Ancillaria, 159 
Ancyloceras, 116, 117 
Aneimites, 29 
Antholithes, 102 
_ Antholithus, 102 
Antillia, 133 
Aphanaia, 62 
Arachnoides, 138 
Area, 62, 106 
Archexocyathus, 33 
Archeopteris, 29 
Arctocephalus, 173 
Argiope, 105 
Aspidorhynchus, 118 
Astarte, 63, 106 
Astartella, 63 
Astartila, 63 
Asterolepis, 91 
Athyris, 46 
Atomodesma, 107 
Atrypa, 18, 47, 201 
Aturia, 171 
Aulopora, 11 
Austrella, 197 
Avicula, 64, 107 
_ Aviculopecten, 64 
Axinea, 156 
Axophyllum, 34 
(The names in Italic are Synonyms.) 
Bairdia, 41, 144 
Balanophyllia, 133 
Banksia, 121 
Belemnitella, 116 
Belemnites, 116, 171 
Belideus, 179 
Bellerophon, 24, 79 
Berenicea, 105 
Bettongia, 172, 179 
Beyrichia, 18 
Billingsia, 34 
Biloculina, 125 
Bornia, 29 
Bothriceps, 197 
Bothrodendron, 32 
Brachymetopus, 41 
Brachythyris, 22 
Brontes, 15 
Bronteus, 15 
Buccinum, 159 
Bulimus, 177 
Bulla, 159, 177, 203 
Bunyalites, 101 
Buskia, 201 
Caberea, 144 
Calamites, 30, 32 
Calamopora, 11, 34 
Calear, 160 
Calymene, 15 
Camaropheria, 47 
Cameroceras, 89 
Campophyllum, 34 - 
Canda, 145 
Canis, 196 
Capulus, 80 
Carcharodon, 171 
Cardinia, 67 
Cardiocarpon, 102 
Cardiocarpum, 102 
Cardiomorpha, 68 
Cardita, 153 
Cardium, 68, 153 
Caryocaris, 15 
Caryophyllia, 134 
Cassidaria, 160 
Cassidulina, 126 
Cassis, 160 
Catenipora, 12 
Catopygus, 138 
