698 



INDEX. 



Spicules of sponges, 225 

 Spider crab, 436, 437 

 Spider monkeys, 651 

 Spiders, 451, 452 

 Spinal canal, 517 

 Spinal ganglion, 533 

 Spindle, directive, 146 

 Spindle fibres, 69 

 Spindle, nuclear, 68 

 Spinnerets, 452 

 Spinous process, 517 

 Spiny ant eaters, 632 

 Spiny lobster, 436 

 Spiracle, 459, 524, 544 

 Spiral valve, 565 

 Spirifer, 328 

 Spirorbis, 313 

 Spirobolus, 497 

 Spirula, 388, 394 

 Spirulidse, 394 

 Spittle bug, 489 

 Splanchnic layer, 159 

 Splanchnopleure, 159 

 Spleen, 550 

 Splenial bone, 582 

 Splint bones, 640 

 Spondyhdse, 367 

 Sponge, fresh-water, 133 

 Sponges, 221 

 Spongida, 221 

 Spongilla, 133, 221, 227 

 Spongillidae, 227 

 Spongioplasm, 61 

 Spontaneous generation, 31 

 Sporangia, 199 

 Spores, 213, 215 

 Sporoblasts, 185, 213, 215 

 Sporocyst, 276 

 Sporosacs, 238 

 Sporozoa, 213 

 Sporozoites, 185, 213, 215 

 Springtails, 477 

 Sprinkling-pot shell, 368 

 Spumellaria, 195 

 Squali, 571 

 Squalus, 571 

 Squamata, 597, 636 

 Squamosal bone, 526 



Squid, 395 

 Squilla, 429 

 Squirrels, 639 

 Staggers, 493 

 Stapes, 525 

 Staphylinidse, 484 

 Starfish, 333 

 Statoblasts. 227, 323 

 Statoliths, 128 

 Stauromedusse, 250 

 Steganopodes, 615 

 Stegocephali, 586 

 Stegosaurs, 597 

 Stellate ganglion, 390 

 Stelmatopoda, 323 

 Stemma, 403 

 Stenops, 649 

 Stenson*s duct, 539 

 "Stentor, 209 

 Stephalia, 244 

 Stephanocyphus, 250 

 Sterna, 615 

 Sternaspis, 314 

 Stercoral pocket, 445 

 Sternum, 462, 518 

 Sticklebacks, 577 

 Stigmata, 459 

 Sting, 472, 486 

 Sting rays, 572 

 Stipes, 463 

 Stink bug, 489 

 Stolo prolifer, 512 

 Stomach, 106 

 Stomatopoda, 429 

 Stomodaeum, 104 

 Stomolophus, 251 

 Stone canal, 330 

 Stone flies, 479 

 Storks, 615 



Stratified epithelium, 73, 74 

 Stratum corneum, 76, 514 

 Stratum Malpighi, 76, 514 

 Streaming of protoplasm, 62, 188 

 Strepsiptera, 483 

 Streptoneury, 373 

 Stridulating organs, 469 

 Striges, 617 

 Strix, 617 



