INDEX. 



Absence of light in deep sea, 16 

 Acontia of sea anemone, 228 

 Actinophrys, or sun animalcule, 76 

 Alternation of generations, 97 

 Amoeba, or proteus, 29, 75 

 Annelids, or tube-making worms, 



315 



Argyll versus Darwin, 277 

 Astraea corals, 234 

 Atlantic ooze and chalk, 51 

 Atolls or Lagoon Islands, 248, 254 

 Avicularium and vibraculum, 305 



Barrier reefs, 248 



Basis of life, 25 



Bathybius, 21 



Bird's head processes, 299 



Blood of annelids, 320 



Boring of teredo, 343 



Boring sponges, 352 



Brain corals, 235 



" Brown bodies" of polyzoa, 297 



Budding of annelids, 318 



Caryophyllia Smithii, 231 

 Chalk makers, or foraminifera, 28 

 Chylaqueous fluid, 321 

 Ciliated sponge gemmules, 137 

 Circulation in radiolaria, 100 

 Circulatory system of sponge, 128 

 Cliona, or boring sponge, 352 

 Cock's-comb or sea-pen, 208 

 Collared monads, 124 

 Continuity of the chalk, 53 

 Coral borers, 242 



Coral builders, 215 

 Coral fishery, 204 

 Coral, growth of, 266 

 Coral islands, Darwin's theory, 272 

 Coral messmates, 316 

 Coral, organ-pipe, 190 

 Coral, red, 196 

 Coral reefs and islands, 247 

 Coral reefs, distribution of, 260 

 Coral reefs, thickness of, 251 

 Corals and limestone, 240 

 Corals, gemmation of, 232 

 Cow's paps, or dead man's toes, 180 

 Cyclosis, or streaming of granules, 

 83 



Darwin's theory of coral islands, 



272 



Deep sea boring annelids, 347 

 Deep sea bottom, 17 

 Deposit of shell structure, 90 

 Depths of living coral, 263 

 Depths of the sea, 7 

 Difflugia, 34 



Diffusion of foraminifera, 62 

 Discovery of polycystins, 69 

 Distribution of coral reefs, 260 

 Distribution of radiolaria, 1 03 



Excavating crustaceans, 349 

 Excavating sponges, 360 

 Excavators, 340 



Fishery of red coral, 203 



Fixed polypes, 156 



Flagellate monads of sponge, 121 



B 2 



