INDEX 



611 



Senility, 433, 434 

 Sensations, 331, 332, 40S 



Sense organs, 104, 149, 155, ISO, 197, 213, 219, 

 222, 243, 255-256, 271-272, 277-278, 299, 

 328-333, 341, 353-354, 309, 380, 395-390, 

 409-410, 445, 408 

 Sensory cells, 130, 137 

 Sensory epithelium, 90 

 Sensory fibers, 327 

 Sensory papillae, 245 

 Sepia, eye, 223 

 Serous secretion, 439 

 Serpent stars, 201 

 Serpula vermicular i s , 244 

 Sertularia, 144 

 Serum, 324 

 Servetus, 552 

 Setae, 229, 231, 254, 545 

 Sex, 40 



cells, 44, 45, 86, 94, 107, 111, 132, 130, 137, 149, 

 155, 195, 248, 442, 448, 531, 532, 538 



chromosomes, 537, 539 



determination, 537, 638 



hormones, 405 



-linked character, 539 



organs, 167, 235 

 Sexual cycle, 88 

 Sexual dimorphism, 443, 543 



Sexual reproduction, 45, 80, 105, 132, 135, 140, 

 149, 162, 189, 248, 311-312, 442-443 



(See also Reproduction) 

 Sexual spores, 88 

 Sexual zooids, 248, 249 

 Shaft, 391, 392 

 Shank, 391 



Sharks, 334, 338-343, 495, 514, 550 

 Sheep, 416, 507 



liver fluke, 170-172, 174 



skull, 407 

 Shelford, 478 



Shell, 189, 190, 208, 209-211. 214, 215, 217-224, 

 220-228, 3S9, 513, 544, 545 



glands, 106-168, 400 

 Shipworm, 221, 227, 228 

 Shore faunas, 483 

 Short digits, 537 

 Shrews, 412 

 Shrimps, 200, 205-267 



Sight, 219, 222, 225, 255-256, 277, 290-297, 299, 

 332-333, 353-354, 309, 380, 382, 385, 395- 

 390, 445 

 Silicon, 19 



Silk, 282, 297-299, 301, 463, 471 

 Silkworms, 83, 273, 282, 463, 471-472, 554 

 .Silurian period. 190, 225, 511, 513, 514 

 Sinuses, 254, 298, 329 

 Sinus venosus, 339, 340 

 Siphons, 204, 208-210, 212, 222, 223 

 Siphuncle, 224 

 Sipunculid, 247 

 Sirenia, 411, 417 

 .Size limit, 44 

 Skates. 334, 341, 342 

 Skeletal lamina, 85 

 Skeletal muscle, 100 



Skeletal system, 102, 103, 437 



(See alxo Skeleton) 

 Skeleton, 130, 203, 306. 307, 316, 318-321, 335, 

 339, 344, 345, .350, 302, 304, 388, .393. 398, 

 400, 422-423, 487-488 

 Skin, 103, 318, 335, 339, 359-360, 304, 366, 368, 

 400, 437, 439, 403 



gills (see Dermobranchiae) 

 Skull. 318, 319, 336, 350, 406-407, 518 

 Skunks, 413, 417 

 Sleeping sickness, 87 

 Sloths, 415, 506 

 Slugs. 220 



Small intestine, 322, 323 

 Smallpox, 491 



Smell, 225, 277, 328-330, .341, 353, 380, 385, 395, 

 410, 445, 408 



(See also Olfactory organs) 

 Snails, 10, 217, 218-220, 220, 481 

 Snakes, 334, 379-381, 383-387, 389, 417, 504 

 Sneezing, 468 

 Snipe, 401 

 Snout, 406 

 Soaring, 398 

 Societies, 291-295, 494 

 Sociology, 5 



Sodium carbonate, IS, 463 

 Sol, 12, 13 

 Soldier ant, 294 

 Soldier termite, 283 

 Solid, 9 



Solitary bees, 293 

 Solitary life, 493 

 Solute, 11 

 Solutions, 11 

 Solvent, 11 

 Soma, 451 



Somatic cells, 94, 95, 451 

 Somatic mesoderm, 123, 307, 376 

 Somatoplasm, 94. 451, 517 

 Somatopleure, 376 

 Song birds, 401, 403, 404 

 Songs, bird, 402 

 Sounds, insects, 277 

 Sow bugs, 202 

 Special creation, 25, 553 

 Specialization, 201, 242, 295, 304, 439 



(See also Adaptation) 

 Species, 3, 58, 59, 522, 542 

 Sperm, 44, 107, 315 



cells, 29, 44. 45. 105-114, 1.32, 136, 140, 150, 

 151, 101, 102, 107, 172, 173, 178, 214, 235, 

 236, 240, 257, 258, 298, 334, 355, 371, 419, 

 448, 493, 528, 630, 5.32, 537, 638, 539, 554 



whale, 417, 421 

 Spermaries, hydra. 135, 140. 141 

 Spermatids, 107, 108 

 Spermatocytes, 107, 108, 538 

 Spermatogenesis, 107-109 

 Spermatogonia, 107, 108, 140 

 Spermatophores, 101, 240 

 Spermatozoon, 107 

 Sphenodon, 505, 500 

 Sphenodoii puttctatum. 387 

 Sphenoidal sinus, 329 



