Primordial Trilobites.  Primordial zone. Proboscidea, of the Miocene; of the Pliocene; of the
  Post-Pliocene.
Producta; horrida; longispina; semireticulata. Productella. Productidoe. Proetus.  Prong-buck. Protaster; Sedgwickii. Proteaceoe. Proteus. Protichnites. Protocystites. Protornis Glarisiensis. Protorosaurus; Speneri. Protospongia; fenestrata. Prototaxites; Logani. Psammobia. Psammodus. Psaronius. Pseudocrinus bifasciatus. Psilophyton; princeps. Pteranodon; longiceps. Pteraspis; Banksii. Pterichthys; cornutus. Pterinoea; subfalcata. Pteroceras. Pterodactylus; crassirostris. Pterophyllum; Joegeri. Pteropoda, of the Cambrian; of the Lower Silurian; of
  the Upper Silurian; of the Devonian; of the Carboniferous;
  of the Permian; of the Jurassic.
Pterosauria; of the Jurassic; of the Cretaceous. Pterygotus Anglicus. Ptilodictya; acuta; falciformis; raripora; Schafferi. Ptychoceras; Emericianum. Ptychodus. Pupa vetusta.  Purbeck Beds; Mammals of. Puryuroidea. Pycnodus. Pyrula.

Quadrumana, of the Eocene; of the Miocene; of the
  Pliocene; of the Post-Pliocene. 
Quadrupeds (see Mammalia). 
Quaternary period. 
Quebec Group.
Quercus.

Rabbits.
Rana.
Raptores.
Rasores. 
Recent period.
Reptaculites. 
Red clays, origin of. 
Red Coral. 
Red Crag. 
Red Deer. 
Reindeer.
Remopleurides. 
Reptiles; of the Permian; of the Trias; of the Jurassic; of
  the Cretaceous; of the Eocene.
Retepora; Ehrenbergi; Phillipsi.
Retiolites.
Retzia.
Rhaetic Beds.
Rhamphorhynchus; Bucklandi.
Rhinoceridoe.
Rhinoceros Etruscus; leptorhinus; megarhinus; tichorhinus.
Rhinopora verrucosa.
Rhizodus.
Rhombus minimus. 
Rhyncholites.
Rhynchonella; cuneata; neglecta; pleurodon; varians.
Rhynchosaurus; articeps. 
Rice-shells. 
Richmond Earth. 
Ringed Worms (see Annelida). 
River-gravels, high-level and low-level.
Robulina. 
Rocks, definition of; divisions of; igneous; aqueous;
  mechanically-formed; chemically-formed; organically-formed;
  arenaceous; argillaceous; calcareous; siliceous.
Rodentia, of the Eocene; of the Miocene; of the
  Post-Pliocene. 
Roebuck.
Rostellaria.
Rotalia; Boueana. 
Rugose Corals; of the Lower Silurian; of the Upper Silurian;
  of the Devonian; of the Carboniferous; of the Permian; of
  the Upper Greensand. 
Rupelian Clay.