INDEX. 



721 



Touch, organs of, in mollusks, 



2."i0 

 Toxodontia, 600, 629 

 Trachymedusse, 62 

 Tracbystomata, 478, 487 

 Transmission, law of, 11 

 Trematodes, structure of, 146. 

 163 

 development of, 147 

 pupa of, 149 

 Tricliina spiralis, 169 

 Trichocepbalus dispar, 169 

 Trigla, 443 

 Trigonocephalus, 499 

 Trilobita, young, 303 

 TriDUcleus, young of, 303 

 Triton, 478 



Trivia californica, 239 

 Trochilus colubris, 551 

 Trocbospliere, 289 



of polyzoa, 186 

 of worms, 147 

 Trocbus, development of, 244 

 Trout, 452 

 Trunk-fisb, 462 

 Trygon, 424 

 Tubularia, 60 

 Tubipora, 85 



Tunicata, development of, 393, 

 401 

 structure of, 386, 405 

 Turbellaria, 142, 162 

 Turdus migratorius, 556 

 Turkey, wild, 546 

 Turtle, green, 510 

 hawkbill, 510 

 loggerhead, 510 

 sea, 510 

 snapping, 510 

 soft-shell, 510 

 swamp, anatomy of, 506 

 tortoise-shell, 510 

 Tylenchus scandens, 170 

 Tylos, 286 



Typhlocolax acuminata, 145 

 Tyroglyphus sacchari, 341 



ULOCTATnUS ABCTICUS, 80 



TJmbellularia groenlandica, 86 

 TJngulata, 600, 629 

 Unio complanatus, 224 

 Urchins, sea, 117 

 Urodela, 478, 484, 488 

 Urolabes pahistris,170 

 Ursus Americanus, 616 



arctos, 616 



maritimus, 616 

 Urus, 613 

 Uvella, 33 



Varan OS, 504 

 Variation of species, 673 

 Veliger stage of mollusks, 233, 



239, 343, 246 

 Velum of rotifers, 176, 178 

 Venus mercenaria, 229 

 Vermes, characters, of 138 



classification of, 238 

 Vertebra, 375 

 Vertebrata, characters of, 369 



classification of, 630 



brain of, 872 



ear of, 385 



eye of, 385 



hair of, 383 



limbs of. 376 



notocbord of, 873 



scales of, 383 



skeleton of, 375 



skull of, 377 



teeth of, 881 

 Vertebrates, relations of ascidians- 

 to, 386 



mollusks to, 221 



worms to, 199, 309, 294 

 Vespertilio subulatus, 591 

 Vinegar worm, 170 

 Viper, 499 



