INDEX. 



m 



Touch, organs of, in mollusks, 



250 

 Toxodontia, 600, 629 

 Trachytnedusee, 62 

 Trachystomata, 478, 487 

 Transmission, law of, 11 

 Trematodes, structure of, 146. 

 163 

 development of, 147 

 pupa of, 149 

 Trichina spiralis, 169 

 Trichocephalus dispar, 169 

 Trigla, 443 

 Trigonocephalus, 499 

 Trilobita, young, 303 

 Trinucleus, young of, 308 

 Triton, 478 



Trivia californica, 239 

 Trochilus colubris, 551 

 Trochosphere, 239 



of polyzoa, 186 



of worms, 147 

 Trochus, development of, 244 

 Troul, 452 

 Trunk-fish, 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 



Ulocyathus abctictjb, 80 

 Umbellularia groenlandica, 86 

 Ungulata,.600, 629 

 Unio complanatus, 224 

 Urchins, sea, 117 

 Urodela, 478, 484, 488 

 Urolabes palustris, 170 

 Ursus Americanus, 616 



arctos, 616 



maritimus, 616 

 Urus, 612 

 Uvella, 32 



Vaeanus, 504 

 Variation of species, 673 

 Veliger stage of mollusks, 232, 



239, 243, 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, 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 aacidians 

 to, 386 



mollusks to, 221 



worms to, 199, 209, 294 

 Vespertilio subulatus, 591 

 Vinegar worm, 170 

 Viper, 499 



