INDEX 



Spermatoryte, 134 

 Spermatogenesis, 134 

 Sptrmatophore, 344 

 Spermatozoa, 72, 134 

 Sperm nucleus, 135 

 Sperm whale, 572 

 Sphreridia, 292 

 Sphitrogastrida, 395 

 Spha?rophrya, 198 

 Sphenethmoid, 514 

 Sphenodon, 527 

 Sphenoidalia. 458 

 Sphenoid bone, 450, 546 

 Sphenopalatine ganglion, 



473 

 Sphenotic, 458 



Sphingina, 433 

 Sphyranura, 244 

 Spicules, sponge, 205 

 Spider crabs, 382 

 Spider monkeys, 574 

 Spiders, 395 

 Spinal canal, 453 



cord, 468 



nerves, 468 



Spine-headed worms, 263 

 Spindle fibres, 60 



nuclear, 60 

 Spinnerets, 395 

 Spinous process, 453 

 Spiny ant-eater, 559 

 Spittle insect, 428 

 Spiracle, 98, 326, 401. 4:1, 



5 02 > 5 l6 

 Spiral valve, 500 



Spirochaeta, 184 

 Spirifer, 290 

 Spirobolus, 434 

 Spirula, 347 

 Sphasroma, 386 

 Splanchnic layer, 148, 201 

 Splanchnopleure, 96, I4-S 

 Spleen, 486 

 Splenomegaly, 184 

 Sponges, 201 

 Spongida, 201 

 Spongilla, 205 

 Spongin, 204 

 Spongioblasts, 205 

 Spongioplasm, 53 

 Spontaneous generation. 23, 



127 



Sporangia, 180 

 Sporocyst, 246 

 Sporogony, 169, 186 



Sporosac, 2 if> 

 Sporozoa, 185 

 Sporozoites, iSS 

 Sports, 20 

 Spring-tails, 419 

 Squali, 506 

 Squamata, 528, 563 

 Squamosal bone, 462 

 Squamous epithelium, 65 

 Squid, 347 

 Squilla, 376 

 Squirrels, 566 

 Stapes, 461 

 Starfish, 295 

 Star-nosed mole, 564 

 Statoblasts, 205, 286 

 Statocysts of medusae, 214 



molluscan, 312 

 Statolith, 118 

 Stauromedusa?, 224 

 Steapsin, 96 

 Steganopocles, 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, 1,14 

 Stomatopoda, 376 

 Stomoda?um, 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 

 Strongylidae, 266 

 Strongylocentrotus, 305 

 Strongyloides, 265 

 Strongylus, 266 

 Struggle for existence, 35, 36 

 Struthiones, 542 

 Stylaster, 217 

 Stylets, 408 

 Stylochus, 242 

 Stylohyoid ligament, 54*; 

 Styloid process, 549 

 Stylommatophora, 336 

 Stylonychia, 197 

 Stylopida;, 422 

 Stylopized, 423 

 Stylorhynchus, 187 

 Sturgeon, 508 

 Subcuticula, 263 

 Subcutaneous tissue, 450 

 Subintestinal vein, 483 

 Submentum, 406 

 Subneural gland, 445 

 Subumbrella, 211 

 Suckers, 510 

 Suck fishes, 511 

 Sucking stomach, 408 

 Suctoria, iq7 

 Suidse, 568 

 Sulci, 470 



Summer eggs, 132, 365 

 Sun animalcules, 173 

 Supporting cells, 74 



tissues, 74 

 Supraoccipital, 458 

 Supracesophageal ganglia, 



"3> 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 



