INDEX 



595 



Tropical animals, coloration, 400 



Tropical concerts, 406 



Tropical environment, 399 



Tropical fresh-water communities, 359 



Tropical insects, 399 



Tropical lakes, 325 



Tropical marine communities, 272 



Tropical rain-forests, 428 



Tropical regions, effect of man, 547 



Tropidurus, 89, 479 



Trouessart, 71 50 , 119 31 



Trout, 30 



Trout region, in rivers, 311 



True, 134 22 , 418 12 , 419 37 



Tschudi, 504". 66 



Tuamotu Archipelago, impoverished 



fauna, 220 

 Tubella pennsylvanica, 291 

 Tubifex, 21, 144, 291, 333, 368 

 Tubipora, 208 

 Tundra, 476 

 T urdus, 128 

 Turitella terebra, 192 

 Turnagra, 389 

 Tychocoen, defined, 141 

 Tylomelania, 347 

 Types of lakes, 343 

 Typhlichthys, 531, 532, 533 

 T. subterraneous, 532 

 Typhlomolge, 533 

 Typhlops braminus, 552 

 Typhlolriton, 533 

 T. spelaeus, 533, 535 

 Tyto alba, 407 



Ubiquitous occurrence, 127 



Uca, 477 



Ulmer, 71 42 , 319 15 



Ulva, 200 



Urtia, 466 



Umbellula, 267 



Umbra, 354 



Unio, 85, 123, 131, 298, 309, 330, 367 



means of dispersal, 61 

 U. margaritifer, 312, 316, 367 

 Upwelling oceanic currents, 154 

 Uranoscopus, 177, 188 

 Uria, 481, 483, 484 

 Urinator, 484 

 Urolophus, 104 



Uronectes, 94, 115 

 Utetheisa pulchella, 124 

 Uvarov, 468 60 , 556* 



Vaccinium, 510 

 Vagility, 122 

 defined, 76 

 Vaginula, 400 

 Valvata, 310, 363 

 V. piscinalis var. antigua, 333 

 Vanadis antarctica, 273 

 Vanadium, 165 

 Vanessa, 143, 396, 508 

 V. cardui, 122 



V. urticae, 394, 495, 496, 509 

 V. urticae var. ichnusae, 394 

 V. urticae var. polaris, 394 

 Vanhoffen, 247 27 

 Van 't Hoff formula, 15 

 Varanus, 548 

 V. komodoensis, 132, 521 

 V. niloticus, 447 

 V. salvator, 56, 132 



Variation of animals in inland waters, 296 

 Vaughan, 31 2 , 119 18 , 222 6B 

 Vavra, 376 



Velella, 226, 239, 252, 261, 262 

 Venerupis, 199 

 Venus, 185 

 V. ovata, 193 

 Verescagin, 96", 358 61 ' 82 

 Vermeleo, 413 

 Vermetus, 220 

 Vernon, 22 20 

 Verrill, 222« 

 Verruca, 267 

 V. stroemii, 193 



Vertebrae, increased number, 159 

 Vertebrate life of the seacoast, 477 

 Vertebrates of the steppes, 462 

 Vespertilio serotinus, 67 

 Vesperugo noctula, 67 

 Vicariation, 78 

 Victoria, 90, 98 

 Victoria Nyanza, 290 

 Vinciguerra, 287 68 

 Vinciguerria sanzoi, 282 

 Vipera berus, 509 

 V. berus var. prester, 493 

 Virbius, 261 



