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514 Smooth Giant Cockle, see Giant Pacific Egg Cockle, 400 Smooth Musculus, 355, pi. aSf Smooth Nut Clam, 335, fig. 70 Smooth Pacific Venus, 408, pi. 31k Smooth Panama Chiton, 325 Smooth Scotch Bonnet, 193, pi. pf Smooth Tellin, 422, pi. 40k Smooth Velutina, 175, pi. 22n Smooth Washington Clam, 417 Smooth Western Nassa, 237, fig. 53f Snails, Life of, 16 Snowflake Marginella, 257, fig. 56m Snub-nose Corbula, 457 Soft-shell Clam, 455, pi. 32X Solander's Trivia, 179, pi. 20U Solarelles, species of, iio-iii Solid Surf Cla?n, see Atlantic Surf Clam, 446 Sombrero Lucina, 385, fig. 78b Sooty Sea-hare, 285 Southern Dwarf Astarte, 376 Southern Miniature Natica, 191, pi. 22) Southern Quahog, 406, pi. 32g Southern Spindle-bubble, 280 Sowerby's Fleshy Limpet, 98, pi. i7h Sowerby's Paper-bubble, 279 Sowerby's Tusk, 331 Sozon's Cone, 261, pi. 14c Spathate Scallop, 367 Species, definition of, 71 Speckled Tegula, 119, pi. i8v Speckled Tellin, 422, pi. 40-I Spengler Clam, Atlantic, 460 Sphenia, Fragile, 455 Spindle-bubbles, species of, 280 Spindles, species of, 243 Spined Spindle-bubble, 281, pi. 26-I Spiny Cockle, see Giant Pacific Cockle, 398 Spiny Cup-and-saucer, 170, fig. ji Spiny Lima, 370, pi. 35g Spiny Margarites, species of, 1 09-1 10 Spiny Paper Cockle, 398, pi. 39n Spiny Periwinkle, see Beaded Peri- winkle, 134 Spiny Slipper-shell, 171, pi. 2iq Spiral sculpture, definition of, 76 Spiral Shell, see Common Spirula, 478 Spirula, Common, 478, fig. 98 Spitzbergen Colus, 229, fig. 5ih Splendid Top-shell, 116, pi. 33c Sponge Oyster, 374, pi. 28b Spoon Clams, species of, 472 Spotted Cla?n, see Calico Clam, 416 Spotted Limpet, 106 Spotted Northern Moon-shell, 189, pi. 22m Spotted Periwinkle, pi. 19J, not in text Spotted Sea-hare, 285 Spotted Slipper-shell, 171 Spotted Thorn Drupe, 211, pi. 24-0 Squamose Chiton, 325 Squid, habits, 47 species of, 479 St. Martha's Razor Clam, 445, pi. 3oh St. Thomas Frog-shell, 197 Star Arene, 122 Star-shells, species of, 123 Stiff Pen Shell, 360, pi. 27X Stearns' Cone, 262, pi. 2 2y Stearns' Mussel, 353 Stearns' Volute, 251 Stimpson's Colus, 227, pi. 23X Stimpson's Cone, 263, pi. 14) Stimpson's Surf Clam, 446, pi. 31W; fig. 26k Stimpson's Transennella, 412, fig. 83a, b Stimpson's Tusk, 329 Stocky Cerith, 154, pi. 19-I Stout Cardita, 379, pi. 29-I Stout Tagelus, 440, pi. 3od Striate Bubble, 277, pi. 13P Striate Cup-and-saucer, 170, pi. 2ir Striate Martesia, 464, pi. 32W Strigilla Clams, species of, 428 Striped False Limpet, 310, fig. 65 Stromboid notch, definition of, 76 Stuart's Trophon, 207, pi. 24J Subgeneric names, 86 Suffuse Trivia, 177, pi. 2iaa Sulcate Barrel-bubble, 280 Sulcate Limopsis, 347, pL 27f Sun-dials, species of, 142 Sim-ray Shell, see Sunray Venus, 416 Sunray Venus, 416, pi. 39b Sunrise Tellin, 421, pi. 4oe Sunset Clam, see Californian Sunset Clam, 441 Superb Gaza, 118, pi. 3b Surf Clams, species of, 446-449 Swift's Corbula, 458, fig. 93b Swimmer's itch, 4 Swollen Egg Shell, see Flamingo Tongue, 183 Tabled Neptune, 231, fig. 5 if Taenioglossate, 78 Tagelus, species of, 440 Tall-spired Turret, 271, fig. 57b Tampa Drill, 213 Tampa Tellin, 424, fig. 86b Tainpa Urosalpifix, see Tampa Drill, Tan Marginella, 254, fig. 56c Tantilla Transennella, 413 Taphria Nut Clam, 338, fig. 72a, b Tawny Murex, see Giant Eastern AIu- rex, 203 Teardrop Alarginella, 259, fig. 56-0 Tectibranchs, species of, 275 Teeth, in mouth, 79, figs. 6, 75 of shell material, 76, 84 Tegulas, species of, 11 8-12 1, pis. 3, 17, 18 Tcinostomas, species of, 139 Tellin-like Cumingia, 436 Tellins, species of, 421-430 Ten-ridged Whelk, see Brown-corded Neptune. 229 Tenta Macoma, 431 Teredos, species of, 465 Tereinus Scallop, 363 Tessellate Nerite, 128, pi. 4f Test's Limpet, 102, pi. i8g Texas Tusk, 329, fig. 69c Texas V^enus, 416, pi. 32k-, fig. 28c Textbooks on moUusks, 490 Thea Drillia, 270, fig. 57f Thick Buttercup, see Thick Lucina, 388 Thick-lipped Drill, 219, fig. 47b Thick Lucina, 388, pi. 38g Thick-ribbed Buccinum, 227, fig. 51b Thick-shelled Heart, see Pointed Venus, 409 Thin Nut Clam, 336, fig. 71a Thin Nut Shell, see Smooth Nut Clam, .335 Thin-shelled Littleneck, 410 Thorn Drupes (Acanthina), 211 Thorny Oysters, species of, 369, pi. 36 Thorny Scallop, see Sentis Scallop, 363" Thorny Slipper Shell, see Spiny Slip- per-shell, 171 Thorson, Gunnar, 30 Thracias, species of, 471 Threaded Abalone, 93, pi. 2d Threaded Vitrinella, 138, pi. i7r Three-colored Top-shell, 113, fig. 33e Three-toothed Cardita, 380 Tides, 57 Tiger Cowrie, 7 Tiger Lucina, 390, pi. 38d Tile-roof Dog-whelk, see Western Mud Nassa, 238 Tindaria, Brown, 341 Tinted Cantharus, 232, pi. 25y Tollin's Wentletrap, 164 Top-shells, species of, 112-117, fig. 33; pis. 3, 17 Tower-shell, see Turrets, 267 Toxoglossate, 79 Trade routes, 8, fig. 2 Trader Pyrene, see Common Dove- shell, 220 Transennellas, species of, 412 Transparent Razor Clam, 442 Transverse Ark, 345, pi. 27s Trapping mollusks, 59 Trellised Chiton, 323 Triangular Limpet, 104 Triangular Marginella, 258 Triangular Trophon, 208, fig. 46b Tridacna Clam, 37 Triforas, species of, 159 Tritons, species of, 194-197, pis. 9, 24, 25 Trivias, species of, 177-179, pis. 20, 21 Trophons, species of, 206-209, ^g- 4*^ True Spiny Jewel Box, 394, pi. 37h True Tulip, 242, pi. 13b Trumpet Triton, 197, pi. 5f Truncate Soft-shell Clam, 455, pi. 32V Trimcated Angel Wing, see Fallen Angel Wing, 461 Tryon, George W., 68