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Common names not used in this book appear in italics and are followed by the modern usage.

Abalone Borer, 464 Abalone, Great Keyhole, 99, pi. i8a AbaloTie Jingle, see False Jingle Shell, 372 Abalones, species of, 92-94, pi. 2 Abbreviations of author names, 87 Abra Clams, species of, 437 Academy Natural Sciences of Phila., 68 Acrior Chiton, 321 Adams' Baby-bubble, 275, pi. 26t Adams' Miniature Ark, 344, fig. 26b Adams' Miniature Cerith, 158, pi. 22t Adams' Spiny Margarite, 109, fig. 3ih Adanson's Pleurotomaria, 92, pi. 36 Adductor muscles, definition of, 81 Admete, Common Northern, 253, fig. 55a Affinis Tagelus, 440 Agate Cha7/m, see Clear Jewel Box, 393 Age, of clams, 34 of snails, 21 Aguayo, C. G., 493 Alaskan Gaper, 450 Alphabet Cone, 260, pi. i4p Alternate Bittium, 155 Alternate Keyhole Lij/tpet, see Cayenne, 96 Alternate Tellin, 427, pi. 4on Amber Pen Shell, 360, pi. 27W American INlalacological Union, 492 American Pelican's Foot, 173, pi. 23c American Star-shell, 124, pi. 3) American Thorny Oyster, see Atlantic Thorny Oyster, 369 Amethyst Gem Clam, 418, pi. 38k; fie;. Amphissas, species of, 223-225 Ample Rough Mya, 454 Ancula, Atlantic, 306, pi. i^i Angel Wing, 460, fig. 94a habits of, 32 Angel Wing, Campeche, 462, pi. 321 Angel Wing, Fallen, 461 Angel Wing, False, pi. 32Z; fig. 94b Angular Triton, 195, pi. 5d Angulate Periwinkle, 133, pi. 19a Angulate Wentletrap, 164, pi. 22b Anthus Clam, see Florida Marsh Clam, 38. Antillarian Date, see Giant Date Mussel, .357 Antillean Lima, 370 Antillean Limpet, 106, pi. 17a Antillean Miter, 248 Antillean Nerite, 129, pi. 4c Antillean Scallop, 366, pi. 34g Antillean Trivia, 178 Antillean Tusk, 330 Aperture, definition of, 75, fig. 23 Apple Murex, 202, pi. lo-l Apple Seed (Erato), 176, pi. 20-0 Approximate Lucina, 387, fig. ySg Archaeology, 7 Arctic Barrel-bubble, 280, fig. 59a Arctic Cancellate Chiton, 312 Arctic Natica, 191, fig. 43b Arctic Paper-bubble, 277, fig. 59b Arctic Rock-borer, see Arctic Saxicave, 452 Arctic Rough Mya, 453 Arctic Saxicave, 452, fig. 92a Arctic Wedge Clam, 451, pi. 32r Arenes, species of, 122 Argonaut, see Paper Nautilus, 485 Arks, species of, 342-346 Arrow Dwarf Triton, 232, pi. 25X Astartes, species of, 375 Atlanta, Peron's, 184, fig. 41 Atlantic Bay Scallop, 367, pi. 331 Atlantic Bittersweet, 348, pi. 27g Atlantic Bob-tailed Squid, 480, fig. 99d Atlantic Carrier-shell, 173, pi. 5b 505 Atlantic Cleft Clam, 384 Atlantic Crenulate Nut Clam, 335 Atlantic Deep-sea Scallop, 365, pi. 33c Atlantic Deer Cowrie, 180, pi. 6f Atlantic Distorsio, 196, pi. 2533 Atlantic Dogwinkle, 214, pi. 25g Atlantic Flat Lepton, 395 Atlantic Gem Turret, 267, fig. 57c Atlantic Gray Cowrie, 180, pi. 6c Atlantic Grooved Macoma, 434, pi. 32y Atlantic Hairy Triton, 195, pi. 9-I Atlantic Jackknife Clam, 443, pi. 30k Atlantic Left-handed Jewel Box, 393, pi. Atlantic Long-finned Squid, 480, fig. 99a Atlantic Modulus, 151, fig. 38 Atlantic Nut Clam, 334, fig. 70a, b Atlantic Oval Squid, 482 Atlantic Oyster Drill, 212, fig. 47c Atlantic Partridge Tun, 199, pi. 9d Atlantic Pearl Oyster, 359, pi. 35c Atlantic Plate Limpet, 104, fig. 22b Atlantic Razor Clam, 442, pi. 3of Atlantic Ribbed Mussel, 351, pi. 28h Atlantic Rupellaria, 420, pi. 3oe Atlantic Sanguin, 439, pi. 4od Atlantic Strawberry Cockle, 398, pi. 39m Atlantic Surf Clam, 446, pi. 32P Atlantic Thorny Oyster, 369, pi. 36b Atlantic Wing Oyster, 359, pi. 35d Atlantic Yellow Cowrie, 180, pi. 6a Augers, species of, 265-267 Austin's Cone, 264 Author names, list of, 87 Awl Miniature Cerith, 157, pi. 19W Awning Clams, species of, 333 Axial, definition of, 76 Baby-bubbles, species of, 275 Baby's Cradle, see Common Atlantic Slipper-shell, 170