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 



nerves, ii. 238 



sensory layer, i. 236 



stratum, i. 236 



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 

 Bozura, 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. 183 

 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 



tissues, ii. 366 



vertebrates, ii. 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 

 Tegumentuvi, 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 Oenerationis, i. 41 

 Thorax, ii. 282 

 Thyroid gland, ii. 336 

 Tibia, ii. 278, 304 

 Tissues, ii. 362, 366 



age of, ii. 361, 3fi6 



connective, ii. 363 



covering, ii. 361, 366 



vascular, ii. 361, 366 



Total cleavage, i. 217, 242 

 Tongue, ii. 331 



arch, ii. 296 



bone, ii. 298 



Tortoise, ii. 120 

 Touch bodies, ii. 220 



