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 

 Spirilla, 388, 394 

 Spirulidee, 394 

 Spittle bug, 489 

 Splanchnic layer, 159 

 Splanchnopleurc, 159 

 Spleen, 550 

 Splenial bone, 582 

 Splint bones, 640 

 Spondyhdce, 367 

 Sponge, fresh-water, 133 

 Sponges, 221 

 Spongida, 221 

 Spongilla, 133, 221, 227 

 Spongillidas, 227 

 Spongioplasm, 61 

 Spontaneous generati<jn, 31 

 Sporangia, 199 

 Spores, 213, 215 

 Rporoblasts, 185, 213, 215 

 Spr)ri;>C3'st, 276 

 Spiirosacs, 238 

 Sporozoa, 213 

 Sporozoites, 185, 213, 215 

 Springtails, 477 

 Sprnikling-pot shell, 368 

 Spumellaria, 195 

 Squali, 571 

 Squalus, 571 

 Squamata, 597. 636 

 Squamosal bone, 526 



Squid, 395 



Squilla, 429 



Squirreb. 639 



Staggers, 493 



Stapes, 525 



Staphylinida;, 484 



Starfish, 333 



Statoblasts, 227, 323 



Statoliths, 128 



Stauromeduss, 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 



Stomod^eum, 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 



Stridiilating organs, 469 



Striges, 617 



Strix, 617 



