Aboriginal implements, 303 Aborigines, probable origin of, 302 _Acanthias_, 270 _Acanthodes_, 261 _Acanthosphaera_, 103 _Acanthothyris_, 166, 167 _Acentrophorus_, 263 _Acrolepis_, 263 _Actaeon_, 197 _Actinoceras_, 205, 207 _Actinocrinus_, 136 _Actinodesma_, 178, 179 _Actinopteria_, 178, 179 _Actinostroma_, 121, 122 _Adeona_, 158 _Aechmina_, 237 _Aeschna_, 250 _Aetheolepis_, 267 _Agathiceras_, 207 AGNATHA, 258 _Agnostus_, 227 _Allodesma_, 176 _Ambonychia_, 177 _Ammodiscus_, 96, 97 _Ammonites_, 204, 209, 210 AMMONOIDEA, 205 _Amoeba_, 36, 95 AMPHIBIA, structure of, 272 _Amphistegina_, 100 _Amplexus_, 117 _Ampyx_, 229 _Amusium_, 185 _Anas_, 283 _Anchura_, 197 _Ancilla_, 198, 199, 202 _Ancyloceras_, 209, 210 ANGIOSPERMEAE, characters of, 40 ANNELIDA, 152 _Anomalina_, 98 _Anomalopteryx_, 283 _Antedon_, 138 ANTHOZOA, 64, 113 Antiquity of man in Australia, 304 _Aparchites_, 237 _Apateolepis_, 262 _Aphnelepis_, 267 _Apocynophyllum_, 91 _Aptornis_, 283 _Aptychopsis_, 246 _Arabellites_, 153 _Arachnoides_, 146 _Araucarioxylon_, 68 _Araucarites_, 89 _Arca_, 184, 186, 188 _Archaeocidaris_, 144 _Archaeocyathina_, 113 ARCHAEOCYATHINAE, 112 _Archaeomaene_, 267 _Archaeopteryx_, 280 _Arctocephalus_, 299 _Arenicolites_, 153 Argillaceous rocks, 69 _Argilloecia_, 237 _?Argiope_, 166 _Argonauta_, 205 ARTHROPODA, structure and subdivisions of, 38, 220 _Asaphus_, 227, 228 _Aspidorhynchus_, 267 _Astarte_, 182 _Asteracanthus_, 269, 271 ASTEROIDEA, 139 _Asterolepis_, 258 _Astralium_, 198, 200 _Astropecten_, 141 _Athyris_, 161, 162, 165 _Atrypa_, 158, 160, 162 _Aturia_, 210 _Atys_, 204 _Aucella_, 183 _Aulopora_, 116 Australian fossiliferous strata, 45-48. AVES, 280 Aviculopecten, 179, 180 _Axopora_, 119