716 



INDEX. 



Species, origin of, 672 



variation of, 10, 672, 673 

 Spermaceti, 593 

 Spermatozoa, formation of, 644 

 Sphaerodorum 231 

 Sphargis coriacea, 510 

 Splienodon, 511 

 Splieotyto cunicularia, 549 

 Spliex iclmeumonea, 383 

 Sphinx, 379 

 Spiders, 362 

 Spirialis Gouldii, 259 

 Spirula Peronii, 281 

 Spliyrna zygaena, 421 

 Spirorbis, 237 

 Spirostreplion Copei, 356 

 Sponges, 42 



useful, 49 

 Spongia adriatica, 49 



equina, 49 



gossypina, 49 



tubulifera, 49 

 Spongilla, 47 

 Spoonbill fish, 428 

 Sporocyst of Nematodes, 151 

 Spring-tails, 364 

 Squalus Americanus, 420 

 Squamella oblonga, 176 

 Squid, anatomy of, 273 

 Squilla, 312 

 Squirrels, flying, 583 

 Star fish, 96, 109, 111 



anatomy of, 96 

 Star worm, 221 

 Statoblast, 187 

 Stegocephala, 482, 488 

 Steller's manatee, 596 

 Stentor polyrnorphus, 36 

 Sternum of insects, 329 

 Stick insect, 677 

 Stickleback, 456 

 Stilt, 546 

 Sting rays, 424 

 Stomapoda, 312, 325 

 Stone lilies, 101 

 Strobila of Hydrozoa, 66 



Strobila of planarians, 144 



tape worms, 156 

 Strobilation in worms, 144, 145, 



234 



Struggle for existence, 673 

 Struthio camelus, 539 

 Sturgeon, embryology of, 427 

 Sturgeon, 427 

 Stygicola dentata, 459 

 Stylaster, 58 

 Styliola vitrea, 258 

 Styloclms elliptica, 144 

 Stylocordyla, 48 

 Stylops, 373, 374 

 Sucker, 453, 454 

 Suctoria, 40 

 Sun fish, fresh water, 455 



banded, 455 



spotted, 456 



salt water, 4G2 

 Swimming, in fishes, 444 

 Sycandra, 44 

 Sycon ciliatum, 45 

 Syllis, 235 



Symmetry, bilateral, in cteno- 

 phores, 92, 93 



echinoderms, 120 

 Synapta, 134, 135 

 Syngnathus peckianus, 461 

 Synthetic types, 483, 679 

 Syrinx, 526, 552 

 Syrnium cinereum, 549 

 Syrphus, 375 



TABULATE CORALS, 58 



Tachiua, 375 



Taenia acanthotrias, 157 



bacillaris, 155 



coenurus, 160, 161 



echinococcus, 158 



mediocanellata, 158 



solium, 155, 157 

 Taeniata, 95 

 Tape worms, development of, 154 



structure of, 153 

 Tardigrades, 361 



