INDEX. 



Sea-fan makers, 180 

 Sea-mat makers, 291 

 Sea-pens, or pennatuke, 207 

 Shells of foraminifera, 43 

 Shell structure in foraminifera, 43 

 Skeleton deposits, 90 

 Skeleton of radiolaria, 94, 106 

 Skeleton of red coral, 202 

 Skeleton of sponges, 112, 118 

 Skeletons of zoophytes, 147 

 Spicules of gorgonia, 185 

 Spicules of sponge, 115, 142 

 Spirorbis on sea-weed, 338 

 Sponge, flagellate monads, 121 

 Sponge gemmation, 134 

 Sponge, nutriment of, 130 

 Sponge reproduction, 132 

 Sponge skeleton, 112, 118 

 Sponge spicules, 115, 142 

 Sponge, structure of, 127 

 Sponge weavers, 109 

 Sponge, what is it? 109 

 Sponges, boring or excavating, 352 

 Sponges, forms of, 1 1 1 

 Stinging organs, or lasso-cells, 223 

 Streaming of granules, 82 

 Structure of polyzoa, 294 

 Structure of radiolaria, 92 

 Study of marine life, 4 

 Subsidence, theory of, 272 



Temperature of the deep sea, 14 

 Teredo, or ship -worm, 341 

 Theories of coral atolls, 269 

 Thread capsules, or lasso-cells, 223 

 Tube masons, 314 

 Tubicolous annelids, 315 

 Tubiporine, or organ-pipe coral, 190 

 Type of coral builders, 219 

 Type of corals, 231 



Vegetation of Lagoon Islands, 257 

 Venus's flower-basket, in, 139 



Weaver tube-worm, 324 

 Worms ! worms ! 339 



XanthellcC or yellow bodies, 94, 99 



" Yellow bodies" of rhizopods, 85, 

 94, 99 



Zoaecium, or polyp home, 294 

 Zooids of millepores, 237 

 Zoospores of radiolaria, 96 

 Zoophytes, or plant animals, 145 

 Zoophytes, medusa-forms, 160 

 Zoophytes, new colonies, 159 

 Zoophytes, phosphorescence, 169 

 Zoophytes, rapid growth, 173 

 Zoophytes, reproduction, 164 

 Zoophytes, to kill, 154 



THE END. 



