702 



INDEX. 



Tritun, sections of embryo, 39 

 Tritonida;, 382 

 Tritubercular teeth, 626 

 Tritylodon, 632 

 Trivium, 334 

 Trochal disc, 293 

 Trochanter, 463 

 Trochidae, 379 

 TrochilidiE, 616 

 Trochilus, 616 

 Trochlear nerve, 536 

 Trochophore, 306 

 Trochosa, 453 

 Trochus, 379 

 Troctes, 479 

 Troglodytidse, 616 

 Troglodytes, 651 

 Trombididae, 454 

 Trophi, 294 

 Tropic birds, 615 

 Tropidonotus, 601 

 Trout, 576 

 Trunk fish, 578 

 Trutta, tail of, 41 

 Trygonidas, 57^ 

 Tubicola, 313 

 Tubificidas, 315 

 Tubinares, 615 



Tubifex, 315 



Tubiporidie, 259 



Tubitelarite, 453 



Tubular glands, 77 



Tubular nervous system, 124 



Tubularije, 239, 241, 242 



Tubulipora, 324 



Tunic, 505 



Tunicata, 505 



TurbeUaria, 268 



Turbinated bone, 620 



Turbinidie, 379 



Turbo, 379 



Turbot, 578 



Turbids, 616 



Turdus, 616 



Turkey, C14 



Turke}' Inizzard, 617 



Turritopsis, 240, 242 



Turtles, 594 



Twixt brain, 534 



Tylenchus, 300 



Tylopoda, 643 



Tympanal organ, 128, 468 



Tympanic annulus, 544 



Tympanic bone, 526 



Tympanic cavity, 621 



Tympanic membrane, 544 



Tympanum, 544 



Type theory, 15 



Typhline, 599 



Typhlops, 601 



Tyrian purple, 380 ' 



Tyrannidte, 616 



Uca, 437 



Uintatherium, 643 



Ulmaris, 247 



Ulna, 529 



Ulnare, 529 



Umbilicus, 370, 554 



Umbo, 358 



Umbrella, 234 



Uncinate process, 605 



Ungues, 618 



Ungulas, 618 



Ungulata, 639 



Unguligrade, 640 



Unicellular glands, 77 



Unicorn, 646 



Unio, 367 



Unionidas, 367 



Ureter, 550 



Urinary bladder, 552 



Urinator, 615 



Urinatores, 615 



Urnatella, 322 



Uroceridse, 486 



Urochorda, 505 



Urodela, 587 



Urogenital sinus, 553 



Urogenital system, 120 



Urogenital system of vertebrates, 550 



Urosalpinx, 379, 380 



UrsidsE, 647 



Ursus, 647 



Use and Disuse. 55, 99 



Uterus, 120, 629 



