462 



GENERAL ZOOLOGY 



Tortoises, 357; box, 35*8; painted, 359 

 Tracheal gills, 25 

 Tree-frogs, 344 ; Brazilian, 343 

 Tree-toads, 344 . 

 Trematoda, 227, 229 

 Trematode, 174, 226 

 Triceratops, 361 

 Trichina, 229 

 Trilobites, 153, 296, 347 

 Trocheiniintb.es, 231, 298 

 Trypsin, 199 

 Tube-feet, 239 

 Tubinares, 376 

 Tunicata, 303 

 Turbellaria, 226, 229 

 Turdidse, 390 

 Turkey-buzzard, 384 

 Turkeys, 381 



Turtles, 357 ; green, 357 ; hawk- 

 bill, 357 



TYNDALL, JOHN, 447 

 Tyrannidse, 388 



Umbo, 157 



Ungulates, 413, 431, 434 ; even-toed, 



416; odd-toed, 416 

 Urethra, 404 

 Uric acid, 162 

 Urodela, 339 

 Urostyle, 331 

 Ursidse, 420 

 Uterus, 405 



Vacuoles, contractile, 282, 288 

 Vacuoles, food, 287 

 Vane, 366 

 Varieties, 96 

 Venues, 234 

 Vertebrates, 292, 301 

 VESALIUS, ANDREAS, 441 

 Vireos, 388, 389, 395; white-eyed, 

 389 



VON BAER'S law, 100 

 Vultures, 383 ; black, 384 



Walking-leaves, 22 ; -sticks, 22 



WALLACE, ALFRED RUSSEL, 102, 450 



Warblers, wood, 388, 395 



Warning coloration, 40 



Wasps, digger, 69 ; mud-dauber, 69 ; 

 social, 65 ; solitary, 68 



Water-boatmen, 30 



Water-moccasin, 355 



Weevils, 90 ; cotton-boll, 90 



WEISMANN, AUGUST, 451 



Whale, sperm, 413; whalebone, 413 



Whip-scorpion, 122 



WHITE, GILBERT, 444 



WILLEY, PROFESSOR, on habits of 

 Nautilus, 192 



Wolves, 420 



Woodchuck, 418 



Woodcock, 381 



Woodpeckers, 385, 395, 397 ; golden- 

 winged, 385; sap-sucking, 385, 

 393; three-toed, 385; yellow-bel- 

 lied, 385 



Worm, acorn-tongue, 304 ; tube, 224 



Wren, house, 395 



AVRIGHT, PROFESSOR R. RAMSAY, on 

 intelligence of monkeys, 426 



Xiphosura,154 



Zoea, 153 



Zooid, 231 



Zoology, among the Greeks and 

 Romans, 437 ; definition of, 436 ; 

 definition of economic, 436; of 

 the sixteenth century, 441 ; of the 

 seventeenth century, 442; of the 

 eighteenth century, 443; of the 

 nineteenth century, 445; system- 

 atic, 436 



