334 
INDEX. 
ASC 
Ascidia, depth at which found, 
117 
Assomption, 250 
Astova, 250 
Atlantic islands, 83, 217 
Atolls, 
breaches in their reefs, 39, 
145 
dimensions of, 27 
dimensions of groups of, 123 
not based on craters, or on 
banks of sediment, or on 
rock, 119, 124, 125, 126, 194 
of irregular forms, 28, 146 
• steepness of their flanks, 31, 
164, 229 
width of their reef and islets, 
28 
their lowness, 122 
lagoons, 35, [285], 
[318] 
general range, 167 
with part of their reef sub- 
merged, and theory of, 37, 
146, 147 
whole reef submerged, and 
theory of, 38,146, 147, [285] 
Augustin, St., 217 
Aurora island, an upraised atoll, 
123 
Aurora, 201 
Austral islands, recently elevated, 
167, 177, 186 
Austral islands, 204 
Australia, N.W. coast, 234 
Australian barrier-reef, 63, 166 
Australian barrier, 222 
Babuyan group, 243 
Bahama banks, 268, 270 
Balabac, 240 
Balfour, Prof. Bayley, descrip- 
tion of Rodriguez, [307] 
Bally, 236 
Bampton shoal, 222 
Banks' islands, 220 
Banks in the West Indies, 267 
Barbes, St., 240 
Baring, 218 
EON 
Barrier -reef 
of Australia, 63, 166 
of New Caledonia, 63, 67 
Barrier-reefs, 
breaches through, 135 
not based on worn-down 
margin of rock, 66 
on banks of sediment, 
67 
on submarine craters, 
68 
steepness of their flanks, 57, 
164 
their probable vertical thick- 
ness, 64, 134 
theory of their formation, 
133, 137, [297] 
Bashee islands, 243 
Bass island, 206 
Batoa, 215 
BeauprA reef, 221 
Beechey, Capt., 
obligations of the author to, 
30 
on submerged reefs, 37 
account of Matilda island, 
101 
Belcher, Sir E. 
on boring through coral- 
reefs, 99 
on changes in Chain atoll, 
172 
on Clipperton rock, 199, 
200 
Bellinghausen, 203 
Bengal, gulf of, elevation of east- 
ern shores of, 181 
Bermuda islands, 275 
Beveridge reef, 212 
Bligh, 220 
Bolabola, view of, 3 
Bombay shoal, 245 
Bonin bay, 238 
Bonin group, 230 
Bonney, Prof. T. G., 
discussion of arguments 
against Mr. Darwin’s 
theory, [325] 
movements of upheaval and 
subsidence, [326] 
