Beds. Pennatulidoe. Pentacrinus; caput-medusoe; fasciculosus. Pentamerus; galeatus; Knightii. Pentremites (see Blastoidea). Pentremites conoideus; pyriformis.  Perching Birds. Percidoe. Periechocrinus. Perissodactyle Ungulates.  Permian period; rocks of, in Britain; in North America;
  life of. 
Persistent types of life. Petalodus. Petraster.  Petroleum, origin of.  Pezophaps. Phacops; Downingioe; granulatus; loevis; latifrons;
  longicaudatus; rana.
Phoenopora ensiformis.  Phalangers.  Phanerogams. Phaneropleuron. Phascolotherium. Pheronema. Phillipsastroea. Phillipsia; seminifera. Pholadomya. Phormosoma. Phorus.  Phosphate of lime, concretions of; disseminated in rocks; origin of. Phyllograptus; typus. Phyllopoda, of the Cambrian; of the Lower Silurian; of the
  Upper Silurian; of the Devonian; of the Carboniferous; of the
  Permian; of the Trias.
Phyllopora. Physa; columnaris.  Pigs.  Pilton Group. Pinites. Pisces (see_ Fishes). Pisolite.  Pisolitic Limestone of France. Placodus; gigas.  Placoid Fishes; of the Upper Silurian; of the Devonian; of
  the Carboniferous; of the Permian; of the Trias; of the
  Jurassic; of the Cretaceous; of the Eocene; of the Miocene.
Plagiaulax. Planolites; vulgaris. Planorbis.  Plants, of the Cambrian; of the Lower Silurian; of the Upper
  Silurian; of the Devonian; of the Carboniferous; of the
  Permian; of the Trias; of the Jurassic; of the Cretaceous;
  of the Eocene; of the Miocene.
Plasmopora. Platanus; aceroides. Platephemera antiqua. Platyceras; dumosum; multisinuatum; ventricosum. Platycrinus; tricontadactylus. Platyostoma; Niagarense.  Platyrhine Monkeys. Platyschisma helicites. Platysomus; gibbosus. Platystoma.  Pleistocene period; climate of. Plesiosaurus; dolichodeirus. Pleurocystites squamosus. Pleurotoma. Pleurotomaria. Plicatula.  Pliocene period; rocks of, in Britain; in Belgium; in
  Italy; in North America; life of.
Pliopithecus; antiquus. Pliosaurus. Podocarya. Podozamites; lanceolatus.  Polir-schiefer. Polycystina; of Barbadoes-earth. Polypora; dendroides. Polypterus. Polystomella. Polytremacis. Polyzoa, of the Cambrian; of the Lower Silurian; of the
  Upper Silurian; of the Devonian; of the Carboniferous; of the
  Permian; of the Trias; of the Cretaceous; of the Miocene.
Populus. Porcellia.  Porcupines.  Portage Group.  Port-Jackson Shark.  Portland beds.  Post-Glacial deposits.  Post-Pliocene period.  Post-Tertiary period. Poteriocrinus.  Potsdam Sandstone.  Pre-Glacial deposits. Prestwichia; rotundata. Primitia; strangulata.