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Lunar Dove-shell, 223, pi. 25gg I- 1 Lunar-marked Cohnnbella, see Lunar Dove-shell, 223 Lunate Crassinella, 377, fig. 28k Lunule, definition of, 82, fig. 27 Lurid Dwarf Triton, 217, figs. 49c, d Lynnhaven Oysters, 375 Lyonsias, species of, 468 MacFarland's Blue Doris, 303 MacFarland's Grand Doris, 304, pi. i6b MacFarland's Pretty Doris, 300, pi. i6g Macomas, species of, 430-434 Macron, Livid, 234, pi. 24X Mactra Clams, species of, 445 Maculated Baby's Ear, 19a Maculated Doris, 304, pi. i6f Magdalena Chiton, 321 Magnum Cockle, 397 Magpie Shell, see West Indian Top- shell, 117 Mahogany Clam, see Ocean Quahog, 381 Mahogany Date Mussel, 357, pi. 28n Maltbie's Trivia, 178, pi. 21Z Mangelias, species of, 272 Mantle-arm index, 486 Many-Angled Drill, see False Drill, 211 Many-lined Lucina, 386, fig. 78f Many-named Caecum, 147, fig. 37m Many-ribbed Ark, 344 Many-ribbed Scallop, see Atlantic Bay Scallop, 367 Many-ribbed Trophon, 207, fig. 46c Marbled Chiton, 325 Margarites, species of, 107-110, fig. 31, pl-3 Marginal tooth (radula), 79 Margin of bivalve shell, 82 Marginellas, species of, 254-260, pi. 11; fig. 56 Maria's Turret-shell, 142, pi. 2oh Marsh Periwinkle, 132, pi. 19c Martesias, species of, 464 Mask Limpet, 103, pi. i8q Mauger's Erato, 176, pi. 22W Mauve-mouth Drill, 211, fig. 47g Mayor's Cadulus, 328 Mayr, Ernst, 72 Maze's Cone, 264, pi. 14k McGinty's Cyphoma, 184, pis. 8, 4s McGinty's Distorsio, 197, pi. 25Z McGinty's Latirus, 241, pi. iib Measled Cowrie, 180, pi. 6d Melo, Miniature, 276, pi. 26U Mera Tellin, 423, fig. 86c Meropsis TeUin, 426, pi. 30U Merten's Chiton, 322 Mesh-pitted Chiton, 320 Messanean Nut Clam, 337 Middle-spined Cerith, 154, pi. i9p Mildred's Scallop, 363, pi. 34c Milk Conch, 174, pi. 23b Milk Moon-shell, 185, pi. 22i Milky Pacific Venus, 411, pi. 3 if Milky Turret-shell, 141 Miniature Ceriths, species of, 157 Miniature Melo, 276, pi. 26U A4iniature Pheasant, 127 Miniature Triton Trumpet, 233, pi. 13-0 Mitchell's Wentletrap, 163, fig. 40b; pi. 22f Miters, species of, 248, pis. 13, 26n Modest Tellin, 425, pi. 31U Modulus, Atlantic, 151, fig. 38 iMoney Cowrie, 7 Money Wentletrap, 165 Monterey Cingula, 135 Monterey Doris, 299, pi. i6h Monterey Miniature Cerith, 158 Monterey Tegula, 121, pi. i8x Moon Snail, feeding, 22, fig. 6 Moon-shells, species of, 185-190, pis. 5, 22 Moore, Hilary B., 247 Moore's Dwarf Olive, 246 Mopalias, species of, 315 Morch's Pitted Murex, 205, pi. 251 Morrhua Venus, 414, pi. 32-1-, fig. 8ie Morris, Percy, 153, 164, 174, 203 Morrison, J. P. E., 68 Alorro Mangelia, 272, fig. 57! Morton's Egg Cockle, 400, pi. 39-I Mossy Ark, 342, pi. 27) Mossy Mopalia, 315 Mottled Caecum, 149, fig. 37f Mottled Red Chiton, 313 Alottled Trifora, 159, pi. 19ZZ Mottled Venus, see Lady-in-waiting Venus, 407 Mouse Cone, 262, pi. 14-0 Mud-flat Octopus, 489 Mijller's Nut Clam, 336 Murex, species of, 201-204, pl- 10 Muscle scars in bivalves, 83 Musculus, species of, 355 Museum Comparative Zoology, 68 Music Volute, Common, 250, pi. i3g Mussel poisoning, 39 Mussels, species of, 351-354 Mya, Arctic Rough, 453 Myopsid squids, species of, 479 Name changing, 86 conservation, 87 Names of mollusks, 85 Narrow Dish Clajn, see Catilliform Surf Clam, 448 Nassa Mud Snail, 18, fig. 3 Nassas, species of, 237-240 Naticas, species of, 191 Native Pacific Oyster, 374, pi. 29f Nautilus, Chambered, 48 Paper, 49, 485 Nautilus, The (Journal), 492 Near Nut Shell, see Atlantic Nut Clam, 334 Neat-ribbed Keyhole Limpet, 98 Needle-pteropods, species of, 294, fig. 64 Neptunes, species of, 229-231 Nerites, species of, 128-130, pi. 4 Netted Ohve, 245, pi. 12c New England Nassa, 239, pi. 23 j Noble Canoe-bubble, 281 Noble False Dial, 1 39 Noble Pacific Doris, 300, pi. i6c Noble Wentletrap, 161, fig. 40c Nomenclature, 85 Norris Shell, 117, pi. i8m North Atlantic Top-shell, 113 Northeast Lucina, 389, pi. 38) Northern Blind Limpet, 107, pi. 17J Northern Cardita, 379, pi. 28t Northern Dwarf Cockle, 404, pi. 30c Northern Dwarf Tellin, 422, pi. 5ox; fig 86f t i^ ^ , g Northern Green Abalone, 93 Northern Horse Mussel, 351, fig. 26) Northern Propeller Clam, 453 Northern Quahog, 406, pi. 32h Northern Razor Clam, see Pacific Razor Clam, 442 Northern Rosy Margarite, 107, pi. i-jt Northern Rough Periwinkle, 133, pi. i9d Northern Yellow Periwinkle, 133, pi. i9f Northwest Onchidella, 275 Northwest Pacific Trophon, 208, fig. Northwest Ugly Clam, 469, pi. 29m Nucleus Scallop, 368, pi. 34h Nudibranchs, species of, 299-310, pis. 15, 16 Nut Clam, feeding by, 38, fig. 14 Nut Clams, species of, 334 Nutmegs, species of, 252 Nuttall's Bladder Clam, 469, pi. 29q Nuttall's Cockle, 403, pi. 31b Nuttall's Lucina, 388, pi. 3ig Nuttall's A'lahogany Clam, 439, pi. 29X Nuttall's Thorn Purpura, 219, pi. 24f Obscure Solarelle, no, fig. 3if, g Ocean Quahog, 381, pi. 32f Octopus, habits, 47 species of, 485-489 Odostomes, species of, figs. 62, 63 Oigopsid squid, species of, 483 Oldroyd's Fragile Moon-shell, 188, fig. Olive Nerite, 129, pi. 4g Olives, species of, 245 Onchidella, Florida, 274 One-banded Lacuna, 131, fig. 36b Onyx Slipper-shell, 171, pi. 2 of Open-mouthed Purple, see Wide- mouthed Purpura, 213 Operculum, definition of, 77, fig. 24 Opisthobranchs, species of, 274-310 Orange-banded Marginella, 258, pL up Orange Hoof -shell, 166 Orange Marginella, 254, pi. iik Orange-spiked Doris, 305, pi. i6e