INDEX 
Nautilus vadiatus, xxii. 
Neomenia cavinata, ix. 
Neomenians, 69 
Neomeniina, 15, 87 
Neptunea, 63 
Neptunea antiqua, 55 
Nevita, 21, 57, 63 
Nevita ustulata, ix. 
Neritida, 103 
Nevitina = Theodoxis 
Nervitodryas, 59 
Nerve centres, 6 
Nervous system, 7, 131, iii. 
Nidamental ribbon, 89 
Northern range of Mollusca, 59, 
60 
Notarchus, 117 
Nucleus of shell, 19 
Nucula (Nut Shell), 32, 34, 106, 
118 
Nucula Cobboldia, xvii. 
Nuculidz, 109 
Nudibranchia (Sea Slugs), 25, 69, 
80, 105, 130 
Nut Shells. See Nucula. 
Ocean-swimming Mollusca, 56 
Octopoda, 42 
Octopus, 43, 75, 132, 137 
Odostomia, 19 
Oigopsida, 42, 132 
Oleacina, 70 
Olfactory sense, 9 
Oliva, 63, 119: 
Oliva porphyria, xi. 
Olivella jaspidea, xi. 
Ommastrephes, xxiv. 
Oncidiida, 96 
Oncidium, 53, 106, 133 
Onychoteuthis Banksii, xxv. 
Ofeas, 88 
Opening shells for prey, 69 
Operculum, 22, 96 
Operculum, types of, viii. 
Opisthobranchia, 25, 126 
Opisthogyre, 31 
Opisthostoma, 98 
Opisthostoma grandispinosa, xxxii. 
Opisthoteuthis, 43 
153 
Ormer. See Haliotis, 
Ornament, uses for, 140 
Ornamentation, 5, 21 
Orthoceras, 37 
Ovihoceras Ludense, xxii, 
Orthogyre, 31 
Oscanius, 122 
Oscanius membyvanaceous, xii. 
Osphradium, 9 
Ostracum, 4 
Ostvea (Oyster), 26, 34, 35, 74, 
83, 89, 98, 112, 119, 133 
Ostvea cornucopia, 98 
Ostrea edulis, Embryo, xxix. 
Ostvea Ricovdeana, xviii. 
Ostreidz, 109 
Otocysts, 9 
Oviparous Mollusca, 88 
Ovo-viviparous Mollusca, 89 
Ovula, 121 
Owenella, 45 
Oxygyurus Kevaudveni, xxvi. 
Oyster. See Ostrea. 
Oyster cultnre, 139 
Oysters on trees, 54 
Pace of a Snail, 115 
Painter’s Mussel. 
pictorum. 
Palzoconcha, 34, 46, 109 
Palaoctopus, 43 
Palaoctopus Newboldi, 49, 111 
Pallial line, 33 
Pallial sinus, 33 
Paludestrina thermalis, 71 
Paludestrinide, 58 
Pandova inequivalvis, xx. 
Panopea Americana, xix. 
Paper Nautilus. See Avgonauta, 
Parasites of Mollusca, 78, 79 
Parasitic Mollusca, 81, 82 
Parmacella calyculata, xiii, 
Partula faba, xiii. 
Patella (Limpet), 10, I1, 53, 94, 
103, 129, 132, 137 
Patella vulgata, 53, ix. 
Patelia vulgata : radula, iii. 
Patellidz, 10, 53 
Patina Pellucida, ix. 
See Unio 
