230 INDEX TO THE GENERA. 
Murex, 165 
Mus, 196 
Mya, 110 
Myacites, 110 
_ Mylodon, 196 
Myonia, 72 
Mpyriolepis, 117 
Mytilus, 72, 110 
Natica, 114, 166, 203 
Naticodon, 84 
Naticopsis, 84 
Nautilus, 90, 117, 171 
Nebulipora, 13 
Niso, 84 
Neggerathia, 102 
Notomya, 72 
Nototherium, 173, 184 
Nucleospira, 20, 201 
Nucula, 73, 111, 155 
Nuculana, 74, 111, 155 
Nummulina, 128 
Ochthodocaryon, 122 
Odontocaryon, 123 
Odontopteris, 97 
Omphalotrochus, 25— 
Omphyma, 13 
Onchopora, 149 
Operculina, 128 
Ophileta, 25 
Orbiculoidea, 48 
Orbitolites, 128 
Orbulina, 128 
Orthis, 18, 20, 49 
Orthoceras, 26, 90 
Orthonota, 23, 74, 79 
Orthotetes, 50 
Osphranter, 185 
Ostrea, 111, 156 
Otodus, 172 
Otopteris, 97 
Oxyrhina, 172 
Pachydomus, 72, 74 
Pachyodon, 67 
Pachysiagon, 186 
Palearca, 23, 76 
Paleaster, 14, 15, 140 © 
Paleoniscus, 117 
Paleopora, 12, 13 
Paleoseris, 136 
Palorchestes, 186 
Panopewa, 105, 111 
Paracyclas, 76 
Paracypris, 144 
Paradoxechinus, 142 
Patella, 84 
Pecopteris, 97 
Pecten, 76, 111, 156, 202 
Pectunculina, 155 
Pectunculus, 156 
Penniretepora, 44 
Pentacoila, 123 
Pentacrinus, 105 
Pentadia, 40 
Pentamerus, 20, 51, aye 
Penteune, 123 
Peragalea, 186 
Peragalia, 186 
Perameles, 186 
Perna, 72, 110 
Perna, 112 
Petraster, 14 
Phacops, 17 
Phalangista, 187 
_ Phascolagus, 187 
Phascolomys, 173, 188, 195 
Phillipsastrea, 37 
Phillipsia, 42 
Phocodon, 173 
Pholadomya, 76, 112 
Pholas, 112 
Phragmoceras, 90 
Phyllodes, 135 
Phyllograptus, 9 
Phyllotheca, 31, 98 
Phymatocaryon, 123 
Pileopsis, 80, 84 
Placotrochus, 136 
Planorbulina, 103, 129 
Planularia, 129 
Plasmopora, 13 
Platyceras, 80, 85 
Platycoila, 123 
Platycrinus, 40 
Platyschisma, 85 
Platytrochus, 201 
Plectodon, 190 
Pleiacron, 124 
Plesiocapparis, 124 
Plesiosaurus, 118 
Pleurodictyum, 13 
Pleuromya, 110 
Pleurophorus, 77 
Pleurorhynchus, 68, 77 
Pleurotoma, 166 
Pleurotomaria, 85, 114, 166, 2038 
Polycope, 42 
Polymorphina, 104, 130 
Polypora, 45 
Polystomella, 130 
Porambonites, 21 
Porcellia, 87 
Poteriocrinus, 41 
Prionotus, 7 
Procardia, 76 
Procoptodon, 190 
Productus, 51 
Proetus, 18 
Propora, 13 
Protaster, 14 
Protemnodon, 191 
Protocardium, 157 
Protoretepora, 45 
Psammechinus, 142 
Psileschara, 149 
Pteria, 64 
