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- Young Hoactzins
- Where a Dinosaur Sat Down
- Typical Texas Foraminifera
- Typical radiolarians
- Typical Pennsylvanian crinoidal limestone
- Typical modern crinoid
- Types of symmetry in a fossil coral
- Type of Huts suggested by Magdalenian drawings 2
- Type of Huts suggested by Magdalenian drawings
- Type of Huts suggested by Magdalenian drawings
- Type of Huts suggested by Aurignacian drawings
- Two extinct attached echinoderms
- Triceratops - A Huge Extinct Reptile
- Tooth of Mastodon and of Mammoth
- Time-chart 6000 B.C. to A.D.
- Thespesius, a Common Herbivorous Dinosaur of the Cretaceous
- The walking-fish or mud-skipper (Periophthalmus)
- The Track of a Three-toed Dinosaur
- The Toxodon
- The Three Giants, Phororhacos, Moa, Ostrich
- The Sub-Man Pithecanthropus
- The Spokeshave
- The Skull and Brain-Case of Pithecanthropus
- The Saurian Age
- The Pitfall
- The Piltdown Man's Bone Implement
- The oldest fossil fish known—discovered in the Upper Silurian strata of Scotland, and named Birkenia by Professor Traquair
- The Missourium of Koch, from a Tracing of the Figure Illustrating Koch's Description
- The Mastodon
- The Mammoth as Engraved by a Primitive Artist on a Piece of Mammoth Tusk
- The Largest Known Dinosaur
- The Kayak
- The Horned Ceratosaurus, a Carnivorous Dinosaur
- The gigantic three-horned Reptile, Triceratops
- The formation of river terraces
- The Development of the Horse
- The Dance
- The Cro-Magnon Man
- The Bow-drill
- The Archæopteryx
- Tertiary mammals - Uintatherium
- Tertiary mammals - Brontotherium
- Tertiary gastropods
- Swimming Reptiles - Plesiosaur
- Swimming Reptiles - Mosasaur
- Swimming Reptiles - Ichthyossaur
- Strepyan Boucher or Hand-axe
- Stone Age Man
- Spears and Harpoons
- Some Reptiles of the Late Paleozoic Age
- Some Oligocene Mammals
- Some Mesozoic Reptiles
- Some Late Mesozoic Reptiles
- Solutrean Flints
- Skulls of Iguanodont and Trachodont Dinosaurs
- Skulls of Horned Dinosaurs
- Skulls of Dinosaurs, illustrating the principal types
- Skull of Phororhacos Compared with that of the Race-horse Lexington
- Skull of Ceratosaurus
- Sketch of a gastrolith—the gizzard stone of an ancient reptile