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- Pithecanthropus, the Sub-man of Java
- Poise of the Mousterian Man
- Primitive Amphibian
- Primitive armored fish
- Restoration of under side of a trilobite
- Rhinoceros tichorhinus, the wooly-coasted Rhinoceros
- Rostro-carinate or Eagle-beak Flint Implement
- Round-headed Ofnet Man
- Saurischian dinosaurs - Allosaurus
- Saurischian dinosaurs - Brontosaurus
- Shaft-straightening
- Skeleton of Tyrannosaurus in comparison with human skeleton
- Sketch of a coprolite—fossilized animal excrement
- Sketch of a gastrolith—the gizzard stone of an ancient reptile
- Skulls of Dinosaurs, illustrating the principal types
- Skulls of Horned Dinosaurs
- Skulls of Iguanodont and Trachodont Dinosaurs
- Solutrean Flints
- Spears and Harpoons
- Stone Age Man
- Strepyan Boucher or Hand-axe
- Swimming Reptiles - Ichthyossaur
- Swimming Reptiles - Mosasaur
- Swimming Reptiles - Plesiosaur
- Tertiary gastropods
- Tertiary mammals - Brontotherium
- Tertiary mammals - Uintatherium
- The Bow-drill
- The Cro-Magnon Man
- The Dance
- The formation of river terraces
- The Kayak
- The Largest Known Dinosaur
- The Piltdown Man's Bone Implement
- The Pitfall
- The Spokeshave
- Two extinct attached echinoderms
- Type of Huts suggested by Aurignacian drawings
- Type of Huts suggested by Magdalenian drawings
- Type of Huts suggested by Magdalenian drawings
- Type of Huts suggested by Magdalenian drawings 2
- Types of symmetry in a fossil coral
- Typical modern crinoid
- Typical Pennsylvanian crinoidal limestone
- Typical radiolarians
- Typical Texas Foraminifera