_Platysomus_, 263 _Plaxiphora_, 190 _Plectroninia_, 112 _Pleioclinis_, 91 Pleistocene birds, New Zealand, 283 " bivalves, 188 " carinate birds, 283 " diprotodonts, 289 " fish, 272 " Foraminifera, 101 " gasteropods, 202 " lobster, 248 " plants, 91 " seal, 299 _Plerophyllum_, 117 _Plesiastraea_, 119 _Plesiolampas_, 148 _Plesiosaurus_, 279 _Pleuracanthus_, 263 _Pleurodictyum_, 114 _Pleuromya_, 183 _?Pleurostomella_, 98 _Pleurotoma_, 198, 199, 202 _Pleurotomaria_, 194, 196, 197, 200, 202 _Plicatula_, 186 Pliocene moa, New Zealand, 281 _Pliosaurus_, 278 _Plotus_, 283 _Podocarpus_, 90 _Poecilodus_, 262 _?Pollicipes_, 243 POLYCHAETA, 152, 154 _Polycotylus_, 279 _Polymastodon_, 286 _Polymorphina_, 98, 100 POLYPLACOPHORA, 189 _Polypora_, 157 POLYPROTODONTIA, 287 _Polystomella_, 101 POLYZOA, characters of, 59, 155 " subdivisons of, 155 Polyzoal limestone, 74 _Porcellia_, 196 Porcupine fish, 270, 271 _Porina_, 158 _Porphyrio_, 283 _Portheus_, 268 _Poteriocrinus_, 137 Prehensile Rat-kangaroo, 295 Preservation of fossils, 319 _Primitia_, 236, 237 _Pristisomus_, 262 _Procoptodon_, 290 _Productus_, 162, 163, 164 _Proechidna_, 287 _Proetus_, 229, 232 _Progura_, 283 _Prosopon_, 246 _Protaster_, 142 _Protocardium_, 185 _Protopharetra_, 113 _Protoretepora_, 157 _Protospongia_, 107,108 PROTOZOA, characters of, 36, 65, 95 _Psammechinus_, 145 _Pseudamaura_, 197 _Psilichthys_, 264 PTERIDOPHYTA, characters of, 40 PTERIDOSPERMEAE, characters of, 40 _Pterinea_, 178, 179 _Pteris_ (_Pteridium_), 91 PTEROPODA, 190, 192, 193, 194 _Pterygotus_, 248, 249 _Ptilograptus_, 122 _Ptychoparia_, 226, 227 _Pugnellus_, 184 _Pulvinulina_, 98 Purbeck marble, 74 _Purisiphonia_, 110 _Purpura_, 191 RADIOLARIA, characters of, 36, 66 " habitat of, 101 " structure of, 101 " subdivisions, 102 Rail, 283 Raised beaches as distinct from middens, 29 _Ranella_, 204 Range-in-time of fossils, 50 _Raphistoma_, 193, 195 Rat-kangaroo, 295 _Receptaculites_, 109 Regular echinoids, 144 _Reinschia_, 78 Reptiles, fossil, 53 " dentition of, 275 " structure of, 274 _Reteocrinus_, 135 _Retepora_, 158 _Reticularia_, 164 _Retiolites_, 124, 128 _Rhacopteris_, 86 _Rhinopterocaris_, 244, 246 _Rhipidomella_, 162 _Rhizophyllum_, 113 _Rhodocrinus_, 135 _Rhombopora_, 156 _Rhynchonella_, 158, 165, 166 RHYNCHOTA, 250 _Rhynchotrema_, 160 _Ringicula_, 202 _Risella_, 191 _Rissoa_, 198 _Rissoina_, 197 _Rostellaria_, 198 _Rotalia_, 96, 101 Rugose corals, 113