INDEX 



557 



Swifts, 419 

 Swine, 454 

 Symbiosis, 124 

 Symmetry, 3, 92, 372 

 Sympathetic system, 354 

 Syrinx, 406, 432 



TcBfiia, 198 



Tail, 362 



Tape- worm (see Tania), 199 



Tapir, 455 



Tarso-metatarsus, 405 



Tarsus, 273, 333 



Teeth, 443 



Teleostei, 373 



Telophase, 26 



Tent caterpillars, 304 



Teredo, 259 



Tergum, 267 



Termites, 299 



Terrapene, 393 



Testis, 76, 233 



Testudinata, 393 



Tetrabranchiata, 263 



Thamnophis, 396 



Thread-worms, 200 



Thrips, 300 



Thrushes, 428, 431 



Thymus, 342 



Thyroid, 342 



Thysanura, 299 



Tibia, 273 



Ticks, 310 



Tiger, 455 



Tissues — definition, 48; differentiation, 



42 ; classification, 49 

 Toad, 382 

 Tortoises, 393 

 Tortoise-shell, 387 

 Toucans, 429 

 Touch, 81 

 Trachea, 338 

 Tracheae, 70, 282 

 Transverse section, 92 

 Tree-toads, 384 

 Trematodes, 196 

 Trichinella, 200 

 Trichoptera, 300 

 Trivium, 213 

 Trochanter, 273 



Trochophore, 202, 235, 255 

 Troglodytidae, 431 

 Trophoblast, 448, 449 

 Tube-feet, 215 

 Tubifex, 239 

 Tunicates, 313 

 Turbellaria, 194, 195 

 Turdidse, 431 

 Turkey, 417 

 Turtles, 393 



Tympanic membrane, 355 

 Typhlosole, 231 



Ungulata, 451, 453 



Unit characters, 492 



Unio, 240, 259 



Univalent chromosomes, 33, 34, 35 



Unsegmented worms, 148, 191 



Upupa, 403 



Urea, 72, 345 



Ureter, 345, 448 



Urethra, 345, 448 



Uric acid, 72 



Urinary bladder, 345, 448 



Uterus, 193, 346, 448 



Vagus (nerve), 353 



Variability, 103, 483, 493 



Varieties, no 



Vas deferens, 253, 287, 345 



Veins, 72 



Veliger, 255 



Venomous snakes, 390 



Ventriculus (stomach), 281 



Vermes, 204 



Vermiform appendix (csecum), 446 



Vertebrae, 330, 331 



Vertebral column, 329 ; divisions of, 330 



Vertebrates, 146, 313 



Villi, 336, 449 



Visceral arches, 337 



Viviparous, 346 



Volvox, 154, 159, 162 



Vorticella, 158, 159, 162 



Vultures, 420 



Walking-stick insect, 123, 126, 298 

 Walrus, 454 

 Warblers, 421 

 Wasps, 307 



