INDEX. 



435 



Spermatozoa, 126, 141 



Sphenethmoid bone, 38 



Sphex, 256 



Sphinx moths, 264 



Spicules, 130, 159 



Spiders, 233 



Spinal accessory nerve, 62 



Spinal cord, 19, 298 



Spinal nerves, 36, 298 



Spine, haemal, 27 



Spine, neural, 27 



Spinnerets, 233 



Spiny ant-eaters, 369 



Spiracles, 16, 76 



Spiracles of insects, 239 



Spiracular cleft, 308 



Spiral valve, 17, 



Spirostrephon, 236 



Spittle-insects, 260 



Splenic artery, 55 



Splenic vein, 55 



Splint-bones, 384 



Sponge, study of, 130 



Sponges, 158 



Spongia, 130 



Spongida, 158 



Sporozoa, 151 



Spring-beetle, 251 



Spring-tails, 243 



Squali, 323 



Squamosal bone, 39 



Squash-bug, 258 



Squash-bug, study of, 89 



Squid, 212 



Squid, dissection of, 103 



Squirrels, 376 



Stapes, 366 



Starfish, dissection of, 110 



Starfish larva, 273 



Starfishes, 276 



Starling, 363 



Stegocephali, 341 



Stellate ganglia, 210 



Stentor, 151 



Sternum, 37, 293 



Sting of insects, 238, 254 



Stink-bug, 259 



Stolon, 165 



Stomach of vertebrates, 306 



Stomach-worms, 182 

 Stone-canal, 112, 274 

 Storks, 359 



Streptoneura, 198, 199 

 Strombus, 200 

 Strongylocentrotus, 115 

 Struggle for existence, 415 

 Struthii, 356 

 Sturgeon, 326 

 Stylonichia, 150 

 Subclavian artery, 59 

 Subclavian vein, 58 

 Subumbrella, 127 

 Suckfish, 331 

 Sunfish, 332, 333 

 Supporting layer, 126, 162 

 Supra-anal plate, 77 

 Supra-renal capsule, 56 

 Supra-scapula, 37 

 Surf-fish, 332 

 Surinam toad, 341 

 Survival of fittest, 415 

 Suspensory apparatus, 322 

 Swallowtail-butterflies, 266 

 Swans, 358 

 Sweetbread, 310 

 Swellfish, 333 

 Swim-bladder, 310, 320 

 Swimmerets, 67 

 Swine, 385 

 Sword-fish, 331 

 Sycon, 159 

 Symmetry, 404 

 Systemic circulation, 59 

 Systemic heart, 104, 195 

 Systole, 134 



Tactile, organs, 300 

 Tadpole, dissection of, 41 

 Ta-nia, 181 

 Tailed birds, 355 

 Tapeworms, 181 

 Tapirs, 383 

 Tarsals, 297 

 Tarso-metatarsus, 49 

 Tarsus, 38 

 Tarsus of insects, 78 

 Taste-organs, 301 

 Tautog, 332 



