502 



INDEX. 



Single-nostrils, ii. 101, 120 

 Sinus urogenitalis, ii. 419, 421 

 Siredon, ii. 129 

 Skeleton, ii. 278 



Skeleton-forming cell-layer, ii. 287 

 Skeleton, muscles of, ii. 194 



plate, ii. 287 



Skin, ii. 195, 229 



covering, ii. 195, 232 



fibrous layer, i. 236 



glands, ii. 201, 232 



layer, i. 236 



muscle layer, i. 236 



muscles, ii. 194 



navel, i. 317 



sensory layer, i. 236 



stratum, i. 236 s 



Skull, ii. 292 



floor, ii. 292 



roof, ii. 292 



vertebrae, ii. 294 



theory of, ii. 295 



Skulled Animals, ii. 100 



Skull less Animals, i. 416; ii. 99 



Small brain, ii. 213, 232 



Soft-bodied Animals, ii. 92, 94 



Soft worms (Scolecida), ii. 86 



Sozobranchia, ii. 129 



Sozura, ii. 129 



Species (idea of), i. 73, 115 



Sperma, i. 171 



Spermaductus, ii. 403, 429 



Spermalists, i. 37 



Spermatazoa, i. 172 



Sperm-cells, i. 172 



Spermococcus, i. 7 S3 



Spermoplasma, i. 183 



Spermulum, i. 183 



Spine, ii. 280 



Spiritualism, ii. 456 



Spoke-bone (Radius), ii. 278, 304 



Sponges, ii. 73, 92 



Spontaneous generation, ii. 30 



Star-animals, i. 435 



Stenops, ii. 164 



Sternum, ii. 278 



Stomach, ii. 330 



intestine, ii. 330 



Struggle for existence, i. 95 

 Subcutis, ii. 232 

 Sucking worms, ii. 76 



Superficial cleavage, i. 229 

 Sweat-glands, ii. 202 

 Swimming-bladder, ii. Ill, 335 

 Sylvian aqueduct, ii. 221 

 Synamcebium, ii. 56 

 System of animals, ii. 92 



germ-layers, i. 273, 327 



mammals, ii. 188 



organs, ii. 194 



tis 



vertebrates, 



120 



TADPOLES, ii. 128 



Tail, human, i. 372 ; ii. 283 



Tail-cap, i. 387 



curvature, i. 369 



sheath, i. 387 



vertebrae, ii. 283 



Tailed apes, ii. 180 



Batrachia, ii. 129 



Tarsus, ii. 278 



Taste, nerve of, ii. 238 



sense of, ii. 238 



Teeth, ii. 173, 331 

 Tegumentum, ii. 199 

 Teleology, i. 16, 109 

 Teleostei, ii. 115, 120 

 Terminal budding, i. 349 

 Tertiary age, ii. 11, 15 

 Testes, ii. 399, 429 



change of place of, ii. 419 



sac, ii. 423, 431 



Testiculi, ii. 399, 429 

 Theoria Generations, i. 41 

 Thorax, ii. 282 

 Thyroid gland, ii. 336 

 Tibia, ii. 278, 304 

 Tissues, ii. 362, 366 



age of, ii. 361, 366 



connective, ii. 363 



covering, ii. 361, 366 



vascular, ii. 361, 306 



Total cleavage, i. 217, 242 

 Tongue, ii. 331 



arch, ii. 296 



bone, ii. 298 



Tortoise, ii. 120 

 Touch bodies, ii. 220 



