602 



INDEX 



Scyphopolyp, 220 

 Si \ phozoa, 220 

 Scvphostoma, 220 

 Sea anemones, 224, 231 



( ucumbi.-rs, 306 



fans, 230 



horses, 511 



lilies, 299 



lions, 565 



otter, 565 



pens, 230 



snakes, 531 



squirts, 441, 443 



urchins, 303 



whips, 230 

 Seals, 565 

 Secodont, 554, 565 

 Secondaries, 534 

 Sectorial, 565 

 Secreta, 65 

 Sedentaria, 277, 396 

 Segmental organs, 105, 272 

 Segmentation cavity, 145 



of body, 126 



of egg, 141 

 Selachii, 506 

 Selection, artificial, 35 



germinal, 43 



natural, 35 



sexual, 40 

 Selenodont, 554 

 Semaeostomeffi, 223 

 Semicircular canals, 117 



478 



Seminal vesicles, 107 

 Semilunar valves, 503 

 Sense organs of vertebrates, 



473 

 Sensory cells, 73 



organs, 114 



roots, 468 

 Sepia, 341, 347 

 Septa, 225, 270 

 Scpial organ, 293 

 Septibranchiata, 325 

 Sericteria, 432 

 Serosa, 414, 491 

 Serpulkku, 277 

 Serripes, 324 

 Sertularia, 218 

 Smim, blood, 78 

 Sesiidse, 433 

 Srrranidae, 511 

 Sexual cells, 130 



characters, secondary, 1 10 



Sexual gland;, 107 



dimorphisn, 40, 169 



epithelium, 69 



organs, 107 



organs of vertebrates, 486 



reproduction, 129 



selection, 40 

 Shad, 510 

 Shaft, 533 

 Shagreen, 505 

 Sharks, 504 

 Sheath of Schwann, 85 

 Sheep, 569 

 Sheep bot, 431 



tick, 431 



Shell gland, 249, 358, 362 

 Ship worms, 325 

 Shoulder blade, 464 

 Shoulder girdle, 464 

 Shrews, 564 

 Shrimp, 380 



brine, 366 



fairy, 366 



mantis, 376 



opossum, 376 

 Siala, 544 

 Sicyonia, 380 

 Siderone, 38 

 Silicispongia?, 204 

 Silenia, 325 

 Siliqua, 324 

 Silk glands, 432 

 Silk worm, 433 

 Siluritke, 510 

 Silver fish, 419 

 Simla, 574 

 Simuliido?, 430 

 Sinupalliata, 324 

 Sinuses, blood, 103 

 Siphon, 305, 310, 339 

 Siphonaptera, 431 

 Siphonate, 310) 

 Siphonoglyphe, 225 

 Siphonophora, 218 

 Siphonostomata, 369 

 Siphonostome, 327 

 Siphuncle, 340 

 Sipunculoidea, 281 

 Sipunculus, 281 

 Siredon, 27 

 Siren, 520 

 Sirenia, 570 

 Sirex, 425 

 Siricidffi, 425 

 Sixth sense, 115 



Skates, 507 

 Skeleton, 91 



axial, 91 



cuticular, in 



dermal, 91 

 Skin, 91 



of vertebrates, 67, 450 

 Skull, 455 

 Skunk, 565 

 Sky-lark, 544 



Sleeping sickness, 184, 431 

 Slime fishes, 491 

 Slime moulds, 180 

 Sloths, 563 

 Smell, 115 

 Smelt, 510 

 Smooth muscles, 81 

 Snails, 325 

 Snakes, 530 

 Snapping turtle, 527 

 Snout beetles, 424 

 Social animals, 156 

 Social insects, 416 

 Soft-shelled crab, 382 

 Soft -shell turtles, 527 

 Solasteridse, 298 

 Sole, 511 

 Solemyidae, 323 

 Solen, 324 

 Sqlenoconchse, 325 

 Solenocytes, 105, 272 

 Solenogastres, 316 

 Solenoglypha, 531 

 Solifugae, 393 

 Solpuga, 393 

 Somatic cells, 130 



layer, 148, 201 

 Somatopleure, 148 

 Somites, 269 

 Sorex, 564 

 Sow bugs, 386 

 Spadella, 263 

 Spadix, 216 

 Spanish flies, 424 

 Sparrows, 544 

 Spatangoidea, 306 

 Spatangus, 306 

 Species, analytic, 141 



crossing of, 2 1 



nature of, 15 



and varieties, 18 

 Spelerpes, 520 

 Speotyto, 544 

 Spermaceti, 572 

 Spermatid, 134 



