IKDKX. 



721 



Touch, organs of, in mollusks, 



250 



Toxodontia, 600, 629 

 Trachymedusse, 62 

 Trachystomata, 478, 487 

 Transmission, law of, 11 

 Trematodes, structure of, 104, 



121 



development of, 105 

 pupa of, 107 

 Trichina spiralis, 127 

 Trichocephalus dispar, 127 

 Trigla, 443 

 Trigouocephalus, 499 

 Trilobita, young, 303 

 Trinucleus. young of, 303 

 Triton, 478 



Trivia californica, 239 

 Trochilus colubris, 551 

 Trochosphere, 233, 244 



of polyzoa, 144 



of worms, 105 



Trochus, development of, 244 

 Trout, 452 

 Trunk-fish, 462 

 Trygon, 424 

 Tubularia, 60 

 Tubipora, 85 



Tunicata, development of, 393, 

 401 



structure of, 386, 405 

 Turbellaria, 100, 120 

 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, 128 

 Tylos, 286 



Typhlocolax acuminnta, 103 

 Tyroglyphus sacchari, 341 



UI-OCYATFIUS ARCTICUP, 80 

 Umbellularia groenlandica, 86 

 Ungulata, 600, 629 

 Unio complanatus, 224 

 Urchins, sea, 199 

 Urodela, 478, 484, 488 

 Urolabes palustris, 128 

 Ursus Americanus, 616 



arctos, 616 



maritimus, 616 

 Urus, 612 

 Uvella, 32 



VARANUS, 504 

 Variation of species, 672 

 Veliger stage of mollusks, 232, 



239, 243, 246 



Velum of rotifers, 176, 178 

 Venus mercenaria, 229 

 Vermes, characters of, 96 



classification of, 176 

 Vertebra, 375 

 Vertebrata, characters of, 369 



classification of, 630 



brain of, 372 



ear of, 385 



eye of, 385 



hair of, 383 



limbs of, 376 



notochord of, 373 



scales of, 383 



skeleton of, 375 



skull of, 377 



teeth of, 381 



Vertebrates, relations of ascidians 

 to, 386 



mollueks to, 221 



worms to, 157, 167 

 Vespertilio subulatus, 591 I 

 Vinegar worm, 128 

 Viper. 499 



