602 



INDEX 



Scyphopolyp, 2:^0 

 Scyphozoa, 220 

 Scvphostoma, 220 

 Sea anemones. 224, 231 



cucumbers, 30O 



fans, 230 



horses, 511 



lilies, 2qo 



lions, 565 



otter, 565 



pens, 230 



snakes, 531 



squirts, 441, 443 



urchins, 303 



whips, 230 

 Seals, 565 

 Secodont, 554. 565 

 Secondaries, 534 

 Sectorial, 505 

 Secreta, 65 

 Scdentaria, 277, 306 

 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 

 Sema^ostomea', 223 

 Semicircular canals, 117 



47S 

 Scininal vesicles, 107 

 Semilunar \'a!\'es, S03 

 Sense organs of vertebrates, 



473 

 Sensor)- cells, 73 



organs, 114 



roots, 46S 

 Sepia, 341, 347 

 Septa, 225, 270 

 Septal organ, 203 

 Septibranchiata, 325 

 Sericteria, 432 

 Serosa, 414, 41)1 

 Serpulida;, 277 

 Serripes, 324 

 Sertularia, 21S 

 Serum, blood, 7S 

 Sesiidas, 433 

 SerranidcE, 511 

 Sexual cells, 130 



characters, secondary, no 



Sexual glands, 107 



dimorphisn, 40, i6q 



epithelium. Oo 



organs, 107 



organs of vertebrates, 4S6 



reproduction, 129 



selection, 40 

 Shad, t;io 

 Shaft, 533 

 Shagreen. 505 

 Sharks. 504 

 Sheath of Schwann, 85 

 Sheep, 5bi) 

 Sheep bot, 431 



tick, 431 

 Shell gland, 240, 35S, 362 

 Ship worms, 325 

 Shoulder blade. 464 

 Shoulder girdle, 404 

 Shrews, 564 

 Shrimp, 3S0 



brine, 366 



fairy, 306 



mantis, 376 



opossum, 376 

 Siala, 544 

 Sicyonia, 3S0 

 Siderone, 38 

 SilicispongiE, 204 

 Silenia, 325 

 Silicjua, 324 

 Silk glands, 432 

 Silk worm, 433 

 Silurid;e, 510 

 Silver fish, 419 

 Simia, 574 

 Simuliida\ 430 

 Sinupalliata, 324 

 Sinuses, blood. 103 

 Siphon, 305, 319, 339 

 Sijihonaptera, 431 

 Siphonate, 319 

 Sijihonogh'phe, 22 q 

 Siphono]>hora. 218 

 Sii)honoslomata, 369 

 Sijihonostome, 327 

 Siphuncle. 340 

 Siiiunculoidea. 281 

 Sii>unculus. 281 

 Siredon. 27 

 Siren, 520 

 Sirenia, s7o 

 Sirex, 425 

 Siricida'. 425 

 Sixth sense, 115 



Skates, 507 

 Skeleton, qi 



axial, 91 



cuticular, iii 



dermal, 91 

 Skin, QI 



of vertelirates, 67, 450 

 Skull, 455 

 Skunk, 565 

 Sky-lark, 544 



Sleeping sickness, 184, 431 

 Slime fishes, 41)1 

 Slime moulils, iSo 

 Sloths, 563 

 Smell, 115 

 Smelt, 310 

 Smooth muscles, Si 

 Snails, 325 

 Snakes. 530 

 Snapping turtle. 527 

 Snout beetles. 424 

 Social animals, 156 

 Social insects, 416 

 Soft-shelled crab, 3S2 

 Soft-shell turtles, 527 

 Solasterida', 2 98 

 Sole, 511 

 Soleinyid.'E, 323 

 Solen, 324 

 Solenoconcha-. 325 

 Solenocytes. 105. 272 

 Solenogastres. 316 

 Solenogly])ha. 531 

 Solifuga^, 303 

 Solpuga, 3()3 

 Somatic cells, 130 



layer, 148, 201 

 Somatopleure, 148 

 Somites, 269 

 Sorex, 5(34 

 Sow bugs, 3S6 

 Spadella, 263 

 S[")adix, 21O 

 Spanish llies, 424 

 Sparrows. 544 

 S]iatangoidea. 306 

 Spatangus. 30O 

 Species, analytic, 141 



crossing of, 21 



nature of, 1 5 



and varieties, iS 

 Spelerpes, 520 

 Speotyto, 544 

 Spermaceti, 572 

 Spermatid, 134 



