INDEX 



153 



Nautilus radiatus, xxii. 



Neomenia carinata, ix. 



Neomenians, 69 



Neomeniina, 15, 87 



Neptunea, 63 



Neptunea antiqua, 55 



Nevita, 21, 57, 63 



Nerita ustulata, ix. 



Neritidae, 103 



Neritina = Theodoxis 



Neritodryas, 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. 

 Nuculidse, 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 



Oliv a porphyria, xi. 



Olivellajaspidea, xi. 



Ommastrephes, xxiv. 



Oncidiidae, 96 



Oncidium, 53, 106, 133 



Onychoteuthis Banksii, xxv. 



O/ws, 88 



Opening shells for prey, 69 



Operculum, 22, 96 



Operculum, types of, viii. 



Opisthobranchia, 25, 126 



Opisthogyre, 31 



Opisthostoma, 98 



Opisthostoma grand? spinosa, xxxii. 



Opisthoteuthis, 43 



Ormer. See Haliotis. 



Ornament, uses for, 140 



Ornamentation, 5, 21 



Orthoceras, 37 



Orthoceras Ludense, xxii. 



Orthogyre, 31 



Oscanius, 122 



Oscanius membranaceous, xii. 



Osphradium, 9 



Ostracum, 4 



Os^mi (Oyster), 26, 34, 35, 74, 



83, 89, 98, 112, 119, 133 

 Ostrea cornucopia, 98 

 Ostrea edulis, Embryo, xxix. 

 Ostrea Ricordeana, xviii. 

 Ostreidae, 109 

 Otocysts, 9 



Oviparous Mollusca, 88 

 Ovo-viviparous Mollusca, 89 

 Ovula, 121 

 Owenella, 45 



Oxygyurus Keraudreni, xxvi. 

 Oyster. See Ostrea. 

 Oyster culture, 139 

 Oysters on trees, 54 



Pace of a Snail, 115 



Painter's Mussel. See Unio 



pic tor um. 

 Palaeoconcha, 34, 46, 109 

 Palceoctopus, 43 

 Palaoctopus Newboldi, 49, 11 1 

 Pallial line, 33 

 Pallial sinus, 33 

 Paludestrina thermalis, 71 

 Paludestrinidse, 58 

 Pandora inaquivalvis, xx. 

 Panopea Americana, xix. 

 Paper Nautilus. SeeArgonauta. 

 Parasites of Mollusca, 78, 79 

 Parasitic Mollusca, 81, 82 

 Parmacella calyculata, xiii. 

 Partula faba, xiii. 

 Patella (Limpet), 10, 11, 53, 94, 



103, 129, 132, 137 

 Patella vulgata, 53, ix. 

 Patella vulgata : radula, iii. 

 Patellidas, 10, 53 

 Patina Pellucida. ix. 



