Costate Wentletrap, 162 Cowrie-helmet, 194, pi. 9c Cowrie, Panther, 7 Cowrie, Tiger, 7 Cowries, species of, 180, pi. 6 Crawford's Nutmeg, 252, fig. 55b Crenellas, species of, 350 Crenulate Tellin, 429, fig. 86h Crenulated Paper-bubble, 283 Crested Oyster, 373, pi. 28c Crispate Slit-shell, 91 Cristate Limopsis, 347 Cross-barred ^enus, 407, pi. 39h Cross-hatched Lucina, 391, pi. 30m Crosse's Tun, 199, pi. 2 3g Crown Conch, Common, 234, fig. 52 Crown Cone, 262, pi. 14m Crusaders, 1 1 Cuming, Hugh, 5 Cumingias, species of, 436 Cup-and-saucers, species of, 169 Clip and Saucer Limpet, see Striate Cup-and-saucer, 170 Cuspidarias, species of, 475-477 Cut-ribbed Ark, 344, pi. 27-0 Cuttlefish bone, 480 Cuttlefish, species of, 479 Cyclostreme, 121 Cylinder Sun-dial, 142 Cyphomas, species of, 183, pi. 4 Dall's Black Turret, 268, fig. 57J Dall's Caecum, 147, fig. 37h Dall's Deepsea Hoof-shell, 166 Dall's Dwarf Gaza, in, fig. 32d, e Dall's Dwarf Tellin, 424, fig. 86d Dall's Egg Cockle, 400 Dall's Little Abra, 437, pi. 30W Dall's Pitted Murex, 205, pi. 25J Dall's Razor Clam, 443 Dall's Rosy Top-shell, 112 Dall's Treasured Simnia, 182, pi. 7f Dall's Trophon, 208, fig. 46a Dall's Wentletrap, 161, pi. 22c Dall, William H., 7 Dark Dwarf Turban, 126 Date Mussels, species of, 356 Decussate Bittersweet, 348, pi. 2 7h Decussate Crenella, 350 DeKay's Dwarf Tellin, 423 Delicate Giant Turret, 268, pi. 13m Dclphinula Nut Clam, 335, fig. 70 Deltoid Rock-shell, 214, pi. 25b, k de Marco, Simon, 68 Dentaliums, species of, 327, fig. 69 Diplodons, species of, 383 Dire Whelk, 232, fig. 5od Discord Musculus, 355, pi. 28c Disk Dosinia, 417, fig. 81 c Dislocated Anger, sec Common Atlantic Auger, 265 Dispersal of shells, 9, 10 Distorsios, species of, 196, pi. 25 Distribution, bathymetric, 18, 32 Divaricate Nut Clam, 336, fig. 72c Doc Bales' Ark, 343, pi. 27k Docoglossate, 79 Dog-head Triton, 196, pi. 9] Dog-whelk, see Nassa or Dogwinkle Dogwinkles, species of, 214 Dohrn's Volute, 251, pi. 13J Domingo Cardita, 378 Donax, species of, 437 Dosinias, species of, 417 Dotted Horn Shell, see Fly-specked Cerith, 154 Doris, species of, 299-307, pis. 15, 16 Dove-shells, species of, 220-224 Drake's Aloon-shell, 187, fig. 43a Dredging, 59, fig. 20 Drillias, species of, 270 Drills, species of, 2 1 1 -2 1 3, 219 Drupes, species of, 211 Dubious Volute, 251 Duck Foot, see American Pelican's Foot, 173 Dusky Tegula, 120, pi. i8y Dwarf Atlantic Planaxis, 150 Dwarf Balloon Eolis, 309, pi. 15c Dwarf Brown Periwinkle, 133, pi. 19k Dwarf Cerith, 154, pi. 19-0 Dwarf Deepsea Miter, 248 Dwarf Glass-haired Chiton, 318 Dwarf Hairy Triton, 195, pi. 2 5n Dwarf Keyhole Limpet, 97 Dwarf Olives, species of, 246 Dwarf Purple Sea-snail, 160, pi. 4-I Dwarf Red Ovula, 181, pi. 2 2q Dwarf Suck-on Limpet, 106, pi. 17b Dwarf Surf Clam, 449, pi. 32-0 Dwarf Tiger Lucina, 391, pi. 30-I Dwarf Tritons (Ocenebra), species of, 216 Dwarf Turbans, species of, 125 Dwarf Turton Clam, eggs of, 41 Dwarf White Moon-shell, 186 Dyes, 1 1 Dye Shell, see Wide-mouthed Purpura, Dyson's Keyhole Limpet, 97, pi. i7n Eared Ark, 344, pi, 27P Eastern Micro-cockle, 399 Eastern Mud Nassa, 240, pi. 23P Eastern Oyster, 375, pi. 28a Eastern Turret-shell, 141, pi. 2ih Eastern White Slipper-shell, 172 Edentulous bivalve shell, 84 Edible Mussel, see Blue Mussel, 354 Egg-cases, of snails, 29, figs. 8, 9 literature on, 495 Egg Cockles, species of, 399 Egg laying, of Paper Nautilus, 49 of Periwinkle, 29 of Whelk, 30 Eggs, of clams, 41 Elegant Dosinia, 417 Elegant Fossarus, 176, pi. 25c Emarginate Dogwinkle, 216, fig. 48a Emerald Nerite, 130, pi. 4h 8id 25W 16 6h Emperor Helmet, 193, pi. 23V Empress Venus, 404, pi. 38-I; fig. Engina, White-spotted, 232, pi. Eolis, species of, 307-310, pis. 15, Equilateral, definition of, 82 Equivalve, definition of, 82, fig. 2 Eratos, species of, 176, pi. 22 Erect Worm-shell, 143-144 Eroded Periwinkle, 134, pi. 20a Eroded Turret-shell, 140, pi. 21 Ervilia, Concentric, 452 Escutcheon, fig. 27 Excavated Slipper-shell, 172 Exchanging shells, 66 Eye, of chitons, 53 of scallops, 43 Faba Crenella, 350, fig. 75a Falcate Date Mussel, 356, pi. 29k Fallen Angel Wing, 461 False Angel Wing, 420, pi. 32Z; fig. 94! False Cerith, 153, fig. 39, pi. 19s False Cup-and-saucer, 165, pi. 2ip False Dials, species of, 139 False Drill, 211, fig. 47f False Jingle Shell, 372, pi. 29d False Limpet, species of, 310, fig. 65 ij False Alussel, Conrad's, 382 False Prickly-winkle, 135, pi. i9h Fan Shell, see Zigzag Scallop, 362 Fargo's Worm-shell, 145, pi. 21b Fat Colus, pi. 23U, not in text Fat Dove-shell, 221 Fat Gulf Donax, 438 Fathom = 6 feet Fat Horsemussel, see Capax Horse Mus- sel, 352 Fat Neptune, 230, pi. 24s Fat Pacific Lepton, 397, fig. Sob Faust Tellin, 428, pi. 40) Fecal pellets, 36, fig. 13 Feeding, by snails, 21 by clams, 35 Fenestrate Limpet, 102, pi. i8t Festive Murex, 206, pi. 24-I Fighting Conch, Florida, 174, pi. 5h Fig Shell, Common, 200, pi. 9i File Dogwinkle, 216, fig. 48d File Fleshy Limpet, 98, pi. 17] File Limpet, 102, pi. 18-0 File Paper-bubble, 283, fig. 59f File Shell, see Lima, 370 File Yoldia, 340, fig. 71b Filose Turret, 273, fig. 57-I Fimbriated Shipworm, 467, fig. 95f Fine-lined Lucina, 387, fig. 78h Fine-ribbed Auger, 266, pi. 26k Fine-sculptured Frog-shell, 198 Fingered Limpet, 103, pi. i8f Fingerprint Cyphoma, 184, pi. 4t Flame Auger, 265, pi. 1311 Flame Helmet, 193 Flamingo Tongue, 183, pis. 8, 4r Flap-tipped Piddock, 463
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