718 



INDEX. 



Troekus, development of, 264 



Trout, 452 



Trunk fish, 462 



Trygon, 424 



Tubularia, 60 



Tubipora, 85 



Tunicata, development of, 203, 211 



structure of, 196, 215 

 Turbellaria, 142, 162 

 Turdus migratorius, 556 

 Turkey, wild, 546 

 Turtle, green, 510 



hawkbill, 510 



loggerliead, 510 



sea, 510 



snapping, 510 



soft-shell, 510 



swamp, anatomy of, 506 



tortoise shell, 510 

 Tylenchus scandens, 170 

 Tylos, 306 



Typhlocolax acuminata, 145 

 Tyroglyplms sacchari, 360 



ULOCYATHUS ARCTICUS, 80 

 Umbel lularia greenlandica, 86 

 Ungulata, 600, 629 

 Unio complanatus, 244 

 Urchins, sea, 117 

 Urodela, 478, 484, 488 

 Urolabes palustris, 170 

 Ursus americanus, 616 



arctos, 616 



maritimus, 616 

 Urus, 612 

 Uvella, 32 



VARANUS, 504 



Variation of species, 672 



Veliger stage of molluscs, 252, 259, 



263, 266 



Velum of rotifers, 176, 178 

 Venus mercenaria, 249 

 Venues, characters of, 138 

 classification of, 238 

 Vertebra, 395 



Vertebrata, characters of, 389 



classification of, 630 



brain of, 392 



ear of, 405 



eye of, 404 



hair of, 403 



limbs of, 396 



notochord of, 393 



scales of, 403 



skeleton of, 395 



skull of, 397 



teeth of, 401 



Vertebrates, relations of ascidians 

 to, 207, 214 



molluscs to, 241 



worms to, 214, 219, 229 

 Vespertilio subulatus, 591 

 Vinegar worm, 170 

 Viper, 499 

 Vipera, 499 

 Vitellogene, 147 

 Viviparous fishes, 444 



reptiles, 495 



sea-urchins, 121, 122 



starfish, 110, 114 

 Vorticella, 39 

 Vulture, 548 



WALRUS, 614 

 Wapati, 608 

 Wasp, 380 

 Water bear, 361 

 Water flea, 299 

 Watering-pot shell, 250 

 Wax wing, 555 

 Whale, 591 



fishery, 594 



sperm, 593 



bone, 592 



white, 595 



Whale's tongue worm, 219 

 Whelk, 268 

 White ant, 367 

 Worms, 138 



flat, 141 

 ' fluke, 14G 



