INDEX 



475 



Spermatozoon, 307 



of crayfish, 308 



typical, 309 

 Sperm-cell, 307 

 Sphseridia, 244 

 Sphcerularia bombi, 238 

 Sphenodon, 282, 349 

 Spicules of Corallium, 231 



of Dead-men' s-fingers, 232 



of sponges. 225 



Spiders, 58, 115, 134, 257, 258 



courtship of, 106 



structure of. 257 

 Spider's web, 31, 168 

 Spinnerets of spiders, 211 

 Spiracle of skate, 211, 213 

 Sponges, 94, 224 



and Ccelenterata compared, 

 232 



Spontaneity, 176 



Spore-cells, 304 



Spores, 299 



Sporocyst, 234, 235 



Sporozoa, 220 



Sprengel, 28 



Spring, signs of, 100 



Squirrel, 129 



Stag, antlers of, 344 



Starchy food, 150 



Starfish, behaviour of, 164, 176 



fighting sea-urchin, 166 



regeneration in, 69 

 Stenorhynchus, 66 

 Stenothermal, 145 

 Stentor, 161 



Steps in evolution, 351 

 Sterne. Carus, 66 

 Sternum, or breastbone, 292 

 Stick-insects, 57 

 Stickleback, 103 



-nest of, 116 

 Stigmata, 255 

 Sting of bee, 211 

 Stinging -animals, 226 

 Stinging-cells, 226 

 Stoat, 394 

 Stockard, 404, 409 

 Stomach of sheep, 148, 149 

 Stone-grig, 271 

 Storing, 127 



Stringops, 50 

 Striped muscle, 144, 354 

 Structure, elements of, 188-218 

 Struggle for existence, 33-47 



defined, 34 



reasons for, 33 



- forms of, 39, 40 

 of parts within the organism, 



72 



Sturdie-worm, 237 

 Stylonichia, 393 

 Suberites domuncula, 67, 226 

 Substitution of organs, 211 

 Succession of types, 342, 349, 



350 



Surinam toad, 119 

 Surrender of parts, 68 

 Surroundings, influence of, 386 

 Survey of Animal Kingdom, 8, 



297 



evolution theories, 431 



Mammals, 296 



Swarming of bees, 82 

 Swarms of termites, 92 

 Swim- bladder, 210 

 Swimming-bell, 336 

 Syllis ramosa, 240 

 Symbiosis, 74, 152, 224 

 Symmetry, 196, 354 



of molluscs, 262 

 Sympathy. 36 

 Synapta, 246, 262 

 Synthesis, 156 

 Synthetic type, 252 



Tadpoles, 279, 280 

 Tcenia echinococcus, 237 



saginata, 237 



solium, 236 

 Tailor-bird, 121 

 Tapeworm, 52, 236, 331 

 Tashiro, 333 

 Tasmanian Devil, 210 

 Technitella, 174 

 Teeth, 214 

 Teleosteans, 374 

 Telescope eyes, 263 

 Telescoping of stages in life- 

 history, 336 



Temperature of birds, 286 



