534 



MOLLUSCA — BRACHTOPODA 



Triopha, 434 



Tritaxeopus, 385 



Triton, 256, 275, 4^0 ; jaws, 212 



Tritonia, 433; protective coloration, 71 



Tritonidea, 424 



Trivia, 419 



Trochidae, egg-capsules, 125 



Trochiscus, 408 



Trochita, 248, 412 



Trochoceras, 395 



Trocholites, 395 



Trochomorpha, 306, 321, 324, 327, 333, 



441 

 Trochonanina, 831, 440 

 Trochosphere, 5, 130 

 Trochotoma, 266, 407 

 Trochus, 263, 4O8 ; eye, 182 ; stomach, 



239 

 TroiJhon, 423 



Tropical beach, Mollusca of a, 3 

 Tropidopliora, 414 

 Tropites, 397 

 Troschelia, 424 

 Truncaria, 423 

 Truncatella, 260, 414 

 Tryblidium, 405 

 Trypanostoma, 340 

 Trypho of Lampsacus, prayer against 



snails, 121 

 Tubed operculates, 157, 266, 300, 307, 



309 

 Tudicla, 424 



Tudor a, 291, 349, 351, 414 

 Tugonia, 456 

 Tulotoma, 340, 4I6 

 Turbinella, 100, 262, 264, 424, 424 

 Turbo, 409 ; eye, 182 ; osphradium, 



195 ; operculum, 268 

 Turbonilla, 250, 332, 422 

 Turcica, 4O8 



Turricula, 425 ; radula, 221 

 Turrilites, 399, 399 

 Turritella, 252, 417 ; radula, 215, 224 

 Tyleria, 459 

 Tylodina, 431 

 Tylopoma, 4I6 

 Tympanotonus, 4I6 

 Tyndaria, 447 

 Typhis, 423 



Ultra-dextral shells, 250 



Umbonella, 409 



Umbonium, 409 



Umbrella, 10, 431 ; radula, 217, 230 



[Incites, 505; stratigraphical distribu- 

 tion, 507, 508 



Underground snails, 48 



Ungulina, 452 



Unicardium, 452 



Unio, 452 ; shell, 254, 259, 273, 341 ; 

 variation, 92 



Union of Umax, 128 



Unionidae, origin of, 15 ; eaten by rats, 



57; larvae, 146 

 Urocyclus, 331, 440 

 Urosalpinx, 423 

 Utriculus, 430 

 Uvanilla, 409 



VagiNULA, 245, 319, 343, 352, 443 

 Vaginulidae, radula, 234 ; anus, 241 

 Valletia, 456 

 Vallonia, 441 



Valvata, 133, 4I6 ; branchia, 159 

 Valves of Chitonidae, 401 f. 

 Vanganella, 454 

 Variation, 82 f. 

 Varicella, 346, 348 

 Velates, 260, 410 

 Velifera, 353, 440 



Veliger stage, 131 ; mistaken for per- 

 fect form, 133 

 Velorita, 302, 453 

 Velum, 131 



Velutina, 275, 4II ; radula, 223 

 Veneracea, 454 

 Venericardia, 451 

 Venerupis, 454 

 Veniella, 451 

 Venilicardia, 451 

 Venus, 270, 271, 446, 454 ; V. merce- 



naria, 97, 374 '^ 



Verania, 391 



Vermetus, 247, 4I8 ; radula, 223 

 Veronicella, 443 

 Verticordia, 458 



Vertigo, 327, 442 ; V. arctica, 287 

 Vexilla, 423 

 Vibex, 417 

 Vitrella, 289 

 Vitrina, 22, 296 f., 332, 440; hardy 



habits, 24 ; jumping powers, 65 ; 



shell, 175 ; radula, 217 

 Vitrinella, 4O8 

 Vitriniconus, 314, 440 

 Vitrinoidea, 314, 440 

 Vitrinozonites, 340, 44O 

 Vitularia, 423 

 Vivipara, 324, 343, 4I6 

 Volume of water, effect in producing 



variation, 94 

 Voluta, 267, 425, 425; spawn, 125; 



radula, 217, 221; distribution, 370; 



prices given for rare, 122 

 Volutaxis, 348 

 Volutharpa, 267, 424 

 Volutolithes, 425 

 Volutolyria, 425 ; radula, 222 

 Volutomitra, 425; radula, 221 

 VohUopsis, 423 

 Volvaria, 429 

 Volvatella, 430 

 Volvula, 430 

 Vulsella, 76, 446, 449 



