Melanopsis, - 
Meleagrina, - 
Mitra, - 
Modiola, - 
Moutvsca, - 
Monoceros, - 
Monodonto, - 
Murex, . 
Multivalves, 
Myaria . 
Mya, = 
Mytilus, - 
Mytilacea, - 
Naiadea,_ - 
Natica, - 
Nautilacea, 
Nautilus, - 
Navicella, - 
Nerita, - 
Neritina, - 
Neritacea, - 
Nucula, - 
Nymphacea, 
Oliva, - 
Onchidium, 
Orbicula, - 
Ostrea, - 
Ostracead, - 
Otion, - 
Ovula, - 
Paludina, - 
Parmacella, - 
Parmophorus, 
Patella, - 
Pandora, - 
Panopea, - 
Pecten, - 
Pectinaria, - 
Pectunculus, 
INDEX. 
Page; 
lil Pedum, 
77, Pectinea, 
144) Peristomiana, 
74° Perna, 
85 Pertricola, 
140 Phasianella, - 
123. Pholas, 
133 Pholadaria, 
9 Physa, 
40 Phyllidia, 
40 | Phyllidiacea, 
73 
73 
Pirena, 
Pinna, 
Pileopsis, 
Planorbis, 
66 | Plicacea, 
116, Planaxis, 
150); Placuna, 
155 
Pleurotoma, 
Pleurobranchus, 
Plicatula,  - 
Plagivstoma, 
Pneumodermon, 
Pollicipes, - 
Podopsis,  - 
Psammobia, 
Psammotea, - 
Pteroceras, - 
Pteropoda, - 
Pupa, - 
Purpura, - 
Purpurifera, 
Pyramidella, 
Pyrula, - 
Pyrgoma, - 
Ranella, - 
Ricinula, 
Rostellaria, 
Rotella, - 
Sabellaria, - 
Sanguinolaria, 
S. 
