386 



INDEX. 



OUva, 328 

 Olive shells, 328 

 Olivella, 329 

 OlividiB, ;;28 

 Olynthoidea, G2 

 Omraastrepliidie, 375 

 Oimiiastreplies, 370 

 Oncliklella, £0;» 

 OnchidiidiE, S09 

 Onoliidiuin, 209 

 Oncliidoi'is, 301 

 Oniscia, 352 

 OnyclioteutUis, 375 

 Opalina, 41 

 Opei-cularia, 45 

 Operculum, 288 

 Ophiacantlia, 151 

 Ophiactis, 150 

 Ophidaster, 159 

 Ophidomonas, 33 

 Opliiobyisa, 152 

 Ophioceramis, 149 

 Ophiociasma, 152 

 Opliiocoina, 151 

 Opliiocnida, 150 

 Ophiocreas, 152 

 Opiilocteii, 149 

 Opliiocyinbium, 151 

 Ophioglyplia, 149 

 Ophiolielus, 152 

 Ophiomiti-a, 151 

 Opliiomusium, 149 

 Ophiomyoes, 152 

 Ophlomyxa, 152 

 Ophionella, 45 

 Ophlopholis, 150 

 Ophiothrix, 151 

 Ophiozona, 149 

 Ophiura, 149 

 Ophiuridse, 148 

 Ophiuroidea, 147 

 Oplirydinae, 43 

 Ophrydium, 27, 45 

 Ophryocotyle, 201 

 Ophyomyces, 152 

 Opisthobranchiata, 295 

 Orbiculina, 18 

 Oi'bitolites, IG 

 Orbuliiia, 20 

 Oreastcr, 159 

 Organic bodies, ii 

 Organ-pipe coral, 123 

 Organs, xiii 



Organs, correlation of, xiv 

 Organs of Bojauus, 251 

 Ormers, 320 

 Orthida), 247 

 Ortlioceras, 368 

 Ostrea, 257 

 Ostreidse, 257 

 Ostrich plume, 86 

 Otina, 307 

 Otocysts, XXX, 84 

 Otoliths, XXX 

 Ovulum, 349 

 Oxygyrus, 355 

 Oxyuris, 212 

 Oyster, 257 



pearl, 262 

 „ thorny, 262 



Pachybatron, 352 

 Pachydrilus, 223 

 Pachytrocha, 45 

 Pallets, 283 

 Pallial chamber, 288 

 Pallial line, 250 

 Pallial sinus, 257 

 Pallium, 249 

 Paludioellidffl, 241 



Paludina, 340 

 PaludinidEB, 340 

 Palythoa, 69 

 Pandora, 282 

 PanopsEa, 281 

 Pantostomata, 32 

 Paper nautilus, 370 

 Paper sailor, 370 

 Paphia, 280 

 Parallolipedum, 268 

 Paramecidse, 39 

 Paramecium, 28, 39 

 Parapodia, 219 

 Parasira, 370 

 Partula, 315 

 Parthenogenesis, xlviii 

 Parypha, 80 

 Patella, 320 

 Patellidae, 320 

 Patiria, 139 

 Peachia, 116 

 Peacock tail volute, 327 

 Pear-shells, 352 

 Pear-snail , 332 

 Pearl oyster, 232 

 Pearly nautilus, 368 

 Pecten, 261 

 Pectinaria, 228 

 Pectinatella, 244 

 PcctinidEe, 260 

 Pectinura, 149 

 Pectunculus, 269 

 Pedata, 180 

 Pedicellaria, 153 

 Pedicellina, 239 

 Pedicellinidas, 239 

 Pedipes, 306 

 Pelagia, 92 

 PelagidsE, 92 

 Pelecypoda, 252 

 Pelican 's-foot shell, 351 

 Pelodera, 207 

 Peneropolis, Ki 

 Pennaria, 80 

 Pennatula, 123 

 Pennatulidae, 123 

 Pentaoeros, 159 

 Pentacrinus, 142 

 Pentacta, 181 

 Pentremites, 139 

 Perichaeta, 222 

 Peridinidfe, 38 

 Peridinium, 38 

 Perinopsis, 172, 176 

 Periphylla, 94 

 PeriphyllidfB, 94 

 Periploma, 282 

 Perisarc,77 

 Peritricha, 43 

 Perivisceral space, xx 

 Periwinkles, 338 

 Perna, 266 

 Peronia, 309 

 Person, 57 



Perspective shell, 326 

 Petalostioha, 172 

 Petricola, 277 

 Petricolidae, 277 

 Petrified fingers, 373 

 Phalansterium, 35 

 Pharetrones, 63 

 Phascolosoma, 217 

 Phasianella, 323 

 Pheasant shells, 323 

 Pheronema, 71 

 Philinldae, 302 

 Philonexidfe, 369 

 Phileus, 162 

 Pholadidea, 286 

 Pholadinae, 283 



Pholas, 285 



Phormosoma, 168 



Phoronis, 218 



Pliorus, 020 



Phospliorax, 319 



Phragmocone, 373 



Phreoryctes, 223 



Piireoryctidse, 222 



Phylactolaimata, 243 



Phyllacanthus, 166 



Phyllidida;, 298 



Phyllirhoe, 300 



Phyllirhoidae, 300 



Phyllodoce, 229 



Physa, 308 



Physalia, 104 



Physemaria, 61 



Physiology, xviii 



Physophora, 102 



Physophorae, 98 



Physophoridse, 102 



Pilgrim's shells, 261 



Pilidium, 217 



Pin-worm, 212 



Pinna, 87, 207 



Pisidium, 275 



Plaouua, 200 



Planaria, li:8 



Planorbinse, 307 



Planorbis, 308 



Plant, iii 



Plants and animals, differences 



between, iii 

 Planula, 78 

 Plastidules, 4 

 Plathelminthia, 187 

 Platycola, 33, 45 

 Platycrinus, 146 

 Platytheca, 33 

 Pleurobrachia, 111 

 Pleurobranchidae, 303 

 Pleurobranchea, 295, 303 

 Pleuro-peritoneal cavity, xii 

 Pleurotoma, 337 

 Pleurotomaridse, 323 

 Pleurotomidse, 337 

 Plumatella, 244 

 Plumularia, 86 

 Plumularidae, 86 

 PneumatopliorsB, 104 

 Pneumodermon, 360 

 Pneumodermonidae, 360 

 Pneumophora, 180 

 Podocyrtis, 12 

 Podoplu-ya, 47 

 Podophryae, 47 

 Podostoma, 32 

 Podostomata, 244 

 Polar globule xlv 

 Polia, 216 



Polian vescicle, 137 

 Polycells, 189 

 Polycera, 300 

 Polyceridae, 300 

 PolychsBta, 225 

 Polycirrus, 235 

 Polyclonia, 92 

 Polycystina, 8, 11 

 Polydora, 227 

 Polygastrica, 6 

 Polygordius, 219 

 Polykrikos, 40 

 Polymastiga, 32 

 Polymorphism, 49 

 Polyseca, 35 

 Polyps, 112 

 Polyp stem, 99 

 Polypides, 237 

 Polypites, 100 

 Polyplaoophora, 293 



