INDEX 



543 



Trapezium, 377. 



Trapezoid, 377. 



Tree hoppers, 209. 



Trematoda, 108. 



Trepang, 104. 



Treviranus, 504. 



Triassic period, 13, 443. 



Trichina spiralis, 122, 123. 



Trichinosis, 122. 



Trichocysts, 45, 46. 



Trichoptera, 226, 227. 



Tridacna gigas, 249. 



TVigonaspis crustalis, galls of, 223. 



Trilobitae, 175, 423. 



Trilobite larva, 173. 



Triradiate spicules, of sponge, 55. 



Triton nodiferus, exterior of shell, 234 ; 



radula of, 231 ; section of shell, 235. 

 Trivium, 90. 



Trochanter, of cockroach, 203. 

 Trochelminthcs, same as Rotifera, q.v. 

 Trochophore, 138. 

 Trochosphere, 138 ; of Gastropoda, 232. 



Troglodites gorilla, 411, 412 ; T. niger, 411. 

 Trogons, 348. 

 Trout, 291, 292. 



Tubipora r/iusica, 77. 

 Tab id arm, 64. 

 Tumblers, 461. 

 Tunic, of Tunicata, 264. 

 Tunicata, 264, 447. 

 Tunny, 293. 



Turbellaria, 106, 447, 451. 

 Turbinares, 349. 

 Turbol, 293. 



Turd us cyanus, 330; T. torquatus, 327. 

 Turkey buzzard, 345. 

 Turkeys, 349, 350. 



Tumtopsis nutricida, 68. 



Turtles, 321. 



Tusks, of elephant, 384; of hogs, 380; of 



walruses, 405. 

 Two-horned rhinoceros, 380. 

 Two-toed sloths, 371. 

 Two-toothed whales, 374. 

 Tympanic cavity, of birds, 332 ; of fowl, 331. 

 Tympanic membrane, of Amphibia, 302 ; of 

 birds, 332; of lizards, 312 ; of turtles, 322. 

 Tympanum, of Amphibia, 302. 

 Type, 9; when first used, 505. 

 Tyrant birds, 354. 



Ulna, of duck, 329 ; of fowl, 331 ; of gorilla, 



359; of Mammalia, 377. 

 Ulnar carpal, of duck, 329. 

 Umbilical cord, of Mammalia, 361 ; of rat, 



367- 

 Umbilical staik, 309. 

 Umbilical vesicle, 309. 



Umbilicus, 311. 



Umbo, 243, 244. 



I nciform, 377. 



Ungulate, 376, 433, 440, 453, 454. 



Unicorn, 496. 



Ureter, of frog, 301 ; of dogfish, 277 ; of 

 Mammalia, 361; of trout, 288. 



Urethra, of Mammalia, 361. 



Urinary bladder, of frog, 301 ; of Mam- 

 malia, 361; of Reptilia, 309; of trout, 

 288 ; of turtles, 322. 



Urochorda, 264. 



Urodasum, of pigeon, 333. 



Urodela, 302, 432. 



Urogenital opening, of Marsupialia, 364. 



Urogenital sinus, of dogfish, 277 ; of trout, 

 288. 



Uropod, 167, 169. 



Uropygial gland, 328. 



Urosalpinx cinerea, 235. 



Urostyle, of frog, 300 ; of Salmo, 292. 



Ursidee, 398. 



Ursus americanus, 398 ; U. arctos, 398 ; I '. 

 ferox (horribilis), 44T ; U. horribilis, 398 ; 

 U. prisons, 441 ; U. spelceus, 441 ; U. 

 syriacus, 398. 



Use and disuse, 459. 



Utamania tor da, 351. 



Uteri, of marsupials, 365. 



Uterus, of Cetacea, 373; of Cyclops, 154; 

 of Hirudo, 144; of Mammalia, 361; of 

 Placentalia, 367 ; of rodents, 386 ; of 

 Selachii,28o; of Sirenia, 372; of Tamia, 

 115; of Turbellaria, 108. 



Vagina, of Mammalia, 361 ; of Placentalia, 



367; of Turbellaria, 108. 

 Vaginas, of marsupials, 365. 

 Vampire bats, 397. 

 Vampyrus spectrum, 397. 

 Variation, methods of studying, 510; origin 



of, 469. 

 Variations, inheritance of, 477; under 



domestication, 461. 

 Variety, 10. 

 Vas deferens, of birds, 335; of Daplinia, 



152; of dogfish, 277; of Hirudo, [44; 



of Lepas, 157; of Mammalia, 361; of 



trout, 288 ; of Turbellaria, 108. 

 Vascular system, of birds, 334. 



ur tentacles, 269. 

 Veliger, 232, 233. 

 Velum, 65; of A mphio xus, 269; of lamprey, 



273; of veliger larva, 232, 233. 

 Velvet, of antlers, 382. 

 Ventral aorta, of dogfish, 277; of lamprey, 



273 ; of trout, 288. 

 Ventricle, of dogfish, 277 ; of frog, 301 ; of 



lamprey, 273; ofpigeon,333 ; of trout, 288. 



