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Rh 24a pi- Do^^ Fryon's Scallop, 366, pi. 33a Tyron's Scallop, 366, pl. 33a. Tucked Margarite, 109, fig. 31a Tulip Band Shell, see True Tulip, 242 Tulip Mussel, 351, pi. 35-I Tulips, species of, 242 Tuns, species of, 199 Turbans, species of, 123-126, pis. 3, 18 Turbine-shell, see Turbans, 123 Turbonilles, species of, figs. 62, 63 Turkey Wing, 342, pl. 27n Turner, Ruth D., 68, 460 Turnip Spindle, 243, pl. 11g Turnip Whelk, 237, pl. 1a Turrets (Turris), species of, 267-273 Turret-shells (Turritella), 140-142 Tusk-shells, habits, 53 morphology, 54, fig. 19 species of, 327, fig. 69 Two-kneeled Hairy-shell, 168, pi. Two-spotted Keyhole Limpet, 99 18e Two-spotted Octopus, 488 Two-tinted Amphissa, 225 Tyrian Purple Dye, 12

Umbilicus, definition of, 76 Umbo, definition of, 81 Umbrella Octopus, Common, 485 Uncinal teeth (radula), 79 Unequal Spoon Clam, 473, pl. 28x United States National Museum, 9, 68 Unstable Limpet, 105, pl. 18zz Uses of moUusks, 3 Value of shells, 6 Valve (bivalve shell), 81 Van der Schalie, H., 68 Vanhyning's Cockle, 401, pi. 32b Vanikoro shell, 167 Variable Arene, 123, pi. 17s Variable Bittium, 155, pi. i9r Variable Cerithiiim, see Dwarf Cerith, 154 Variable Dwarf Olive, 246, pi. 22V Variable Nassa, 239, pi. 2 3r Variable Top-shell, 116, fig. 33b Variable Wedge Shell, see Coquina Shell, 437 Variation in shells, 71 Variegated Dove-shell, 223 Variegated Lacuna, 131 '^ariegated Screw Shell, see Variegated Turret-shell, 141 /ariegated Turret-shell, 141, pi. 2ii ■/arix, definition of, 75 Vase Shell, 245 Vatikiotis, Sozon, 262 Veiled Pacific Chiton, 316, fig. 66a Velie's Marginella, 258 Velutina, Smooth, 175, pi. 2 2n Venus Clams, species or, 404-416 Venus-heart, see Astarte, 375 Verticord, Ornate, 474, fig. 97c, d Villepin's Cone, 263, pi. i4f Violet Snails, see Purple Sea-snails, 160 Virgin Marginella, 257, fig. 56h Virgin Nerite, 129, pi. 41 Virginia Oyster, see Eastern Oyster, 375 Virgulate Chiton, 325 Vitrinellas, species of, 138 Viviparity, 28, 42 Volcano Limpet, 100, pi. i8c Volute Turret, 273 Volutes, species of, 250 Walking Sea-hare, 286 Wart-necked Piddock, 436 Warty Cone, 263, pi. 22Z Washington Clam, Common, 417, pi. 31-1 Washington Wood-eater, 463 Water glass, 59, fig. 20 Watson's Canoe-bubble, 281, pi. 26m Watson's Gaza, 118, fig. 32a Waved Astarte, 376, pi. 2 8r Wavy-lined Scallop, 367 Wavy Pacific Thracia, 472, pi. 31s Wavy Turban, 124, pi. i8p Weathervane Scallop, see Giant Pacific Scallop, 361 Wedge Clam, Arctic, 451, pi. 32r Wedge-shaped Martesia, 465 Wedge-shell, see Donax, 437 Well-ribbed Dove-shell, 221, pi. 2 5ff Wentletrap, Precious, 6 Wentletraps, species of, 161-165, pl. 20, 22 West Coast Bittersweet, 349, pi. 316 West Coast Rupellaria, 420, pi. 3 it Western Atlantic Tusk, 329 Western Atlantic Ventletrap, 163 Western Baby's Ear, 190 Western Banded Tegula, 120, pi. i8h Western Barrel-bubble, 281 Western Caecum, 149, fig. 37J Western Chubby Simnia, 183, pi. 7g Western Fat Nassa, 239, fig. 53e Western Lean Nassa, 240, fig. 53d Western Mud Nassa, 238, pi. 2on Western Pandora, 470 Western Ringed Lucina, 389, fig. 2 8f Western Three-winged Murex, 205, fig. 45c Western Tree Oyster, 358 Western White Slipper-shell, 172 West Indian Awning Clam, 333 West Indian Chank, 244 West Indian Crown Conch, 235, pi. 23h West Indian Cup-and-saucer, 169, pi. 21S West Indian Fighting Conch, 173, pi. 5g West Indian Dwarf Olive, 246, pi. iih, ] West Indian Murex, 203, pi. loa West Indian Pointed Venus, 409 West Indian Tegula, 118 West Indian Top-shell, 117, fig. 34 West Indian Vanikoro, 167 West Indian Worm-shell, 144, fig. 22i, pi. 21C Whelks (Busycon), species of, 235-237 White Amiantis, see Pacific White Venus, 416 White Atlantic Doris, 302 White Atlantic Semele, 434, pi. 4og White-banded Drillia, 270 White-barred Chiton, 317, fig. 67b White Bearded Ark, 342, pi. 27r White Cancellate Bittium, 156 White-cap Limpet, loi, pi. i8r White Crested Tellin, 430, pi. 30-0 White Dwarf Turban, 125 White Giant Turret, 268, pi. 13-I White Globe Trivia, 179 White Hoof -shell, 166, pi. 2 it White-knobbed Drillia, 271, fig. ^-jd. White Miniature Ark, 343, pi. 27U White Northern Chiton, 322 White Pygmy Venus, 408 White Sandcla?n, see White Sand Ma- coma, 432 White Sand Macoma, 432, fig. 88c White Smooth-edged Jewel Box, 392 White-spotted Dove-shel', 222, pi. 25hh White-spotted Engina, 232, pi. 25W White-spotted Latirus, 241, pi. iie White-spotted Marginella, 256, pi. iim White Strigilla, 429 Wide-mouthed Purpura, 14, 213, pi. 25-I Willcox's Sea-hare, 285 Wi?je-colored Auger, see Concave Au- ger, 266 Winged Stromb, see Fighting Conch, Winged Tree Oyster, see Flat Tree Oyster, 358 Wobbly Keyhole Limpet, loi, pi. i7g Wood-louse, Atlantic, 192, pi. 25s Woody Mopalia, 315 Worm-shells, species of, 143-145, pis. 20, 21 Woven Lucina, 388 W'rinkled Lepton, 395, fig. 80a Wrinkled-ribbed Wentletrap, 164 Writhing Shell, see Atlantic Distorsio, 196 Wroblewski's Wentletrap, 162, pi. 20J Yellow Apolymetis, see Pacific Grooved Macoma, 434 Yellow Cockle, 397, pi. 39P Yellow False Doris, 306, pi. 15J Yellow Helmet, see Emperor Helmet, 193 Yellow Mussel, 352, pi. 351 Yellow-spotted Cowry, see Atlantic Yellow Cowrie, 180 Yoldia-shaped Macoma, 433 Zebra Cowrie, see Measled Cowrie, i8o Zebra Nerite, 129, pi. 46 Zebra Periwinkle, 132, pi. i9e Zebra Shell, see Zebra Nerite, 129 Zigzag Scallop, 362, pi. 33d Zoological Record (publication), 490