INDEX 



603 



Spermatocyte, 134 

 Spermatogenesis, 134 

 Spermatophore, 344 

 vSpermatozoa, 72, 134 

 Sperm nucleus, 13 s 

 Sperm whale, 572 

 Sphacridia, 292 

 Spha;rogastrida, 305 

 Spha;rophrya, iqS 

 Sphenethmoid, 514 

 Sphenodon, 527 

 Sphenoidalia, 458 

 Sphenoid bone, 450, 546 

 Sphenopalatine ganglion, 



473 

 Sphenotic, 45S 

 Sphingina, 433 

 Sphyranura, 244 

 Spicules, sponge, 205 

 Spider crabs, 382 

 Spider monkeys, 574 

 Spiders, 305 

 Spinal canal, 453 



cord, 46S 



nerves, 468 

 Spine-headed worms, 26S 

 Spindle fibres, 60 



nuclear, 60 

 Spinnerets, 395 

 Spinous process, 453 

 Spiny ant-eater, 559 

 Spittle insect, 428 

 Spiiracle, 98, 326, 401, 411, 



502, 516 

 Spiral valve, 500 

 Spirocha;ta, 184 

 Spirifer, 290 

 Spirobolus, 434 

 Spirula, 347 

 Sphjeroma, 386 

 Splanchnic layer, 14S, 201 

 Splanchnopleure, g6, 148 

 Spleen, 486 

 Splenomegaly, 1S4 

 Sponges, 201 

 Spongida, 201 

 Spongilla, 205 

 Spongin, 204 

 Spongioblasts, 205 

 Spongioplasm, 53 

 Spontaneous generation, 23, 



127 

 Sporangia, 180 

 Sporocyst, 246 

 Sporogony, 169, 186 



Sporosac, 216 

 Sporozoa, 185 

 Sporozoites, 18S 

 Sports, 20 

 Spring-tails, 419 

 Squali, 506 

 Squamata, 528, 563 

 Squamosal bone, 462 

 Squamous epitheliuin, 65 

 Squid, 347 

 Squilla, 376 

 Squirrels, 566 

 Stapes, 461 

 Starfish, 295 

 Star-nosed mole, 564 

 Statoblasts, 205, 2S6 

 Statocysts of medusa;, 214 



moUuscan, 312 

 Statohth, irS 

 Stauromeduste, 224 

 Steapsin, 96 

 Steganopodes, 543 

 Stegocephali, 519 

 Stegomya, 430 

 Stegosaurs, 528 

 Stellate ganglia, 343 

 Stelmatopoda, 287 

 Stemma, 354 

 Stenops, 572 

 Stenostoma, 93 

 Stenson's duct, 475 

 Stentor, 196 

 Stephanocyphus, 224 

 Stercoral pocket, 390 

 Sterna, 543 

 Sternaspis, 277 

 Sternite, 404 

 Sternum, 404, 454 

 Sticklebacks, 511 

 Stigma, 98 

 Stigmata, 401 

 Sting, 413 

 Sting rays, 507 

 Stink bugs, 428 

 Stipes, 406 

 Stolo prolifer, 448 

 Stomach, 94 

 Stomatopoda, 376 

 Stomoda^uni, 94 

 Stomolophus, 223 

 Stone canal, 292 

 Storks, 544 



Stratified epithelium, 66 

 Stratum corneum, 67, 450 



Malpighii, 67, 450 



Strepsiptcra, 422 

 Streptoneury, 328 

 Stridulating organs, 410 

 Strix, 544 

 Strobila, 221, 247 

 Strobilation, 221 

 Strong)did;e, 266 

 Strongylocentrotus, 305 

 Strongyloides, 265 

 Strong)dus, 266 

 Struggle for existence, 35, 36 

 Struthiones, 542 

 Stylaster, 217 

 Stylets, 408 

 Stylochus, 242 

 Stylohyoid ligament, 549 

 Styloid pjrocess, 541) 

 Stylomnratophora, 336 

 Stylonychia, 197 

 StylopidcE, 422 

 Stylopized, 423 

 Stylorhynchus, 187 

 Sturgeon, 508 

 Subcuticula, 263 

 Subcutaneous tissue, 450 

 Subintestinal vein, 4S3 

 Submentum, 406 

 Subneural gland, 445 

 Subumbrella, 211 

 Suckers, 510 

 Suck fishes, 5ir 

 Sucking stomach, 408 

 Suctoria, 197 

 Suida:, 568 

 Sulci, 470 



Summer eggs, 132, 365 

 Sun animalcules, 173 

 Supporting cells, 74 



tissues, 74 

 Supraoccipital, 458 

 Supracesophageal ganglia, 



ii3> 354 

 Suprarenals, 489 

 Supratemporal fossa, 522 

 Surf perch, 511 

 Sus, 568 

 Swallows, 544 

 Swallow tails, 433 

 Swans, 543 

 Sweat glands, 546 

 Swell fishes, 512 

 Swim bladder, 482, 502 

 Swimming birds, 543 

 Swine, 568 

 Sword fishes, 511 



