269 



INDEX. 



The names in italics are all names of places, and refer exclusively to the Appendix ; in 

 well-defined archipelagoes, or groups of islands, the name of each separate island is not 

 given. 



ABR 



Abrolhos, Brazil, coated by corals, 



79 

 Abrolhos {Australia), 229 

 Absence of coral-reefs from certain 



coasts, 81 

 Acaba, gulf of, 255 

 Admiralty group, 219 

 Africa, east coast, fringing-reef of, 



76. Madreporitic rocks of, 179 

 Africa, east coast, 246 

 Age of individual corals, 95, 96 

 Aiou, 226 

 Aitutaki, 202 

 Aldabra, 244 

 Alert reef, 217 



Alexander Grand Duke, island, 205 

 Allan, Dr. 



on Holuthurise feeding on corals, 



20 

 on quick growth of corals at 



Madagascar, 104 

 on reefs affected by currents, 79 

 AUoufatou, 211 

 Alphonse, 243 

 Amargura, 210 

 Amboina, 227 

 America, west coast, 197 

 Amir antes, 243 

 Anachorites, 220 

 Anambas, 234 



Anamouka, description of, 175 

 Anamouka, 210 



ATO 



Andaman islands, 233 

 Antilles, 263 

 Appoo reef, 235 

 Arabia Felix, 250 

 Areas, 



great extent of, interspersed 



with low islands, 121 

 of subsidence and of elevation, 



187 

 of subsidence appear to be 



elongated, 188 

 of subsidence alternating with 

 areas of elevation, 189 

 Arru group, 226 

 Arzobispo, 225 

 Ascension, no reef at, 83 

 Ascidia, depth at which found, 116 

 Assomption, 243 

 Astova, 243 



Atlantic islands, 83, 213 

 Atolls, 



breaches in their reefs, 39, 145 

 dimensions of, 27 

 dimensions of groups of, 121 

 not based on craters, or on 

 banks of sediment, or on 

 rock, 118, 123, 124, 125, 191 

 of irregular forms, 28, 143 

 steepness of their flanks, 29, 



162, 224 

 width of their reef and islets, 

 28 



