214 INVERTEBRATE PALAEONTOLOGY 



Arachnida, 153, 172 

 Aragonite, 14, 20 



durability, 40 

 Arbacia, 200 

 Archaean, 119 

 Archaeocidaris, 163 

 Archaeocyathidae, 129 

 Atchaeoniscus, 194 

 Archanodon, 84, 168 

 Arcidae, 187 

 Arctica, 189, 205 

 Arenaceous rocks, 17, 27 

 Arenig, 124 



Argillaceous rocks, 17, 27 

 Aristocystis, 134 

 Arthropoda, 32 



cainozoic, 208 



coal-measures, 40 



deuterozoic, 170 



fluviatile, 83 



habitat, 87 



mesozoic, 194 



proterozoic, 148 



terrestrial, 82 

 Asaphus, 151 

 Ascendant stocks, 92 

 Ascoceras, 148 

 Aspidobranchiata 



cainozoic, 205 



deuterozoic, 168 



mesozoic, 190 



proterozoic, 146 

 Aspidoceras, 192 

 Astarte, 189, 205 

 Asteroceras. 191 

 Asteroidea, 45 

 Asthenodonta, 205, 190 

 Asthenosoma, 182 

 Astropecten, 181 

 Athyris, 1 66 

 Atremata, 107 



deuterozoic, 164 



proterozoic, 141 

 Atrypa, 31, 143, 166 

 Aturia, 208 

 Aulacoceras, 193 

 Aulacothyris, 186 

 Auloporidae, 130 

 Axonolipa, 132 

 Axonophora, 132 

 Azoic, 2, 120 



Bacteria, 15 



Bactrites, 169, 193 

 Bactriticone, 103 

 B acuities, 104, 193 

 Bakewellia, 167 

 Balanophyllia, 199 

 Balanus, 208 

 Barbados earth, 29, 198 

 Barnacles, 48, 152 

 Barroisia, 178 

 Barton clay, 18, 27, 32 

 Barytes, 46 

 Bather, F. A., 60 

 Bathonian, 31 

 Beecher, 98 

 Beekite, 44 

 Beetle-cases, 83 

 Belemnitella, 193 

 Belemnites, 38 

 Belemnoidea, in, 193 

 Belemnoteuthidae, 193 

 Belinurus, 172 

 Bellerophon, 147, 168 

 Beloptera, 208 

 Beltina, 153 

 Benthic fauna, 82, 87 

 Berenicea, 184 

 Beyrichia, 32, 85, 152 

 Billingsella, 142 

 Bilobites, 142 

 Biology, I, 9 

 Birth, 115 



Blastoidea, 45, 136, 161 

 Blende, 46 

 Bolland, 161 

 Borings, 20, 23 

 Borrowdale series, 124 

 Bothriocidaris, 138 

 Boulder clay, 38 

 Bourgetia, 190 

 Bourgueticrinus, 180 

 Brachiopoda, 15, 31, 34, 42, 

 107, 126 



brachidia, 64 



cainozoic, 202 



deuterozoic, 164 



evolution, 1 1 1 



habitat, 87 



hinge, 43 



mesozoic, 185 



morphogeny, 97 



proterozoic, 140 



range, 109 

 Bracklesham beds, 32 



