Sabal major.  Sabre-toothed Tiger. Saccammina. Saccosoma.  Salamanders.  Salina Group. Salix; Meeki_. Salmonidoe. Sao hirsuta. Sassafras cretacea. Sauropterygia. Scalaria; Groenlandica. Scaphites; oequalis. Schizodus.  Schoharie Grit. Scolecoderma. Scoliostoma. Scolithus; Canadensis.  Scorpions of the Coal-measures.  Scorpion-shells.  Screw-pines. Scutella; subrotunda.  Sea-cows (see Sirenia).  Sea-lilies (see Crinoidea).  Sea-lizards (see Enaliosaurians).  Seals.  Sea-mats and Sea-mosses (see Polyzoa).  Sea-shrubs (see Gorgonidae).  Sea-urchins (see Echinoidea).  Sea-weeds.  Secondary period.  Sedimentary rocks. Semnopithecus.  Septaria. Sequoia; Couttsioe; gigantea; Langsdorffii. Serolis.  Serpents (see Ophidia). Serpulites.  Sewalik Hills (see Siwalik Hills).  Sheep.  Shell-sands. Sigillaria; Groeseri.  Sigillarioids.  Silicates, infiltration of the shells of Foraminifera by.  Siliceous rocks.  Siliceous Sponges.  Silicification.  Silurian period (see Lower Silurian and Upper Silurian). Simosaurus; Gaillardoti. Siphonia; ficus.  Siphonostomatous Univalves. Siphonotreta. Sirenia; of the Eocene; of the Miocene. Siren lacertina. Sivatherium; giganteum.  Siwalik Hills, Miocene strata of.  Skiddaw Slates.  Sloths. Smilax. Smithia.  Snakes (see Ophidia).  Soft Tortoises. Solarium.  Solenhofen Slates.  Solitaire. Spalacotherium. Spatangus. Sphoerospongia. Sphagodus. Sphenodon. Sphenopteris.  Spiders of the Coal-measures.  Spider-shells.  Spindle-shells. Spirifera; crispa; disjuncta; hysterica; mucronata; Niagarensis;
  rostrata; sculptilis; trigonalis.
Spiriferidoe. Spirophyton cauda-Galli. Spirorbis; Arkonensis; Carbonarus; laxus; Lewisii; omphalodes;
  spinulifera.
Spirulirostra. Spondylus; spinosus.  Sponges, 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.
Spongilla. Spongillopsis. Spongophyllum.  Spore-eases, of Cryptogams in the Ludlow rocks; in the Coal.  Squirrels. Stagonolepis.  Staircase-shell.  Stalactite.  Stalagmite.  Star-corals.  Star-fishes.  St Cassian Beds. Stephanophyllia. Stereognathus. Stigmaria; ficoides.  Stonesfield Slate; Mammals of.  Strata, contemporaneity of.  Stratified rock. Streptelasma. Streptorhynchus. Stromatopora; rugosa; tuberculata. Strombodes; pentagonus. Strombus. Strophalosia. Strophodus. Strophomena; alternata; deltoidea; filitexta; rhomboidalis;
  Subplana. 
Sub-Apennine Beds.  Sub-Carboniferous rocks.  Succession of life upon the globe. Suida.  Sulphate of lime. Sus Erymanthius; scrofa. Synastroea. Synhelia Sharpeana. Synocladia; virgulacea. Syringopora; ramulosa.