476 



INDEX 



Temperature of body, 153 

 Temporal variations, 334 

 Tendons, 144 

 Terebella conchilega, 240 

 Termites, 24, 90 

 Terrestrial animals, 7 

 Terrifying attitudes, 64, 67 

 Testacella, 261 

 Testudo grceca, 286 

 Theory of Descent, 421 

 Thermogenic function of 



muscle, 145 

 Third eyelid, 213 

 Thomson, M. H., 407 



- Sir Wyville, 4 

 Thoreau, 303 

 Threadworms, 151, 238 

 Thylacine, 293 

 Thyroid gland, 154, 207 

 Thysanura, 256 

 Tissues, 197 

 Titanosaurus, 281 

 Toads in stones, 278 

 Tomopteris, 240 

 Tortoise, 126, 285 

 Tower, 407 

 Trachese, 252 

 Tracheal gills, 256 

 Transmissibility, 431 



- of modifications, 400 

 Trematoda, 233 

 Treviranus, 398, 420 

 Trial and error, 160, 165 

 Trichina, 238 

 Trichocephalus, 238 

 Trigona, 84, 128 

 Trilobites, 258, 347, 348 

 Trimen, 62 



Triton, 278 



Trochosphere larvae, 240, 263 

 Tropidonotus natrix, 285 

 Tropidorhynchus, 64 

 Tropisms, 164 

 Trotting horse, 385 

 Trypanosoma, 224 

 Trypsin, 147 

 Tse-tse fly, 224 

 Tube-feet, 244, 245 

 Tubifex, 236, 238 

 Tubipora musica, 228 



Tubularians, 227 

 Tunic of tunicates, 269 

 Tunicates, 268 

 Turbellaria, 233 

 Turtles, 51, 285 

 Tylenchus tritici, 238 

 Tympanic bulla, 214 

 Tympanum, 210 



- of frog, 277 

 Typhlops, 285 



Ugliness, 195 



Umbrella ants, 86 



Ungulates, 294 



Unicellular animals, 93, 159, 192 



Unio, 260 



Unpalatable animals, 60, 64 



Unsegmented worms, 233 



Urea, 153 



Use and disuse, effects of, 384 



Varanus, 282 

 Variability, 184, 185, 365 

 Variable hare, 394 

 Variation, 57, 334, 399, 426, 



427, 

 in lizards, 334 



- possible causes of, 427 

 Varieties of pigeon, 341 

 Variety of life, 3 

 Veliger larvae, 263 

 Venom-gland of snake, 285 

 Venus-flower-basket, 12 

 Vertebrae of frog, 277 

 Vertebrate acquisitions, 354 



- animals, 265-97 



- typical, 265 

 Vertebrates, 297 



- and Invertebrates contrasted, 

 266 



Verworn, 351 

 Vestigial organs, 212, 342 

 Vinegar-eels, 46, 238 

 Violent death, 333 

 Viper, 285 

 Vitalism, 186, 187 

 Vitality, 180-7 

 Vivarium, 21 

 Voles, 130 

 Volvox, 301 



