- The Skull and Brain-Case of Pithecanthropus
- The Spokeshave
- The Sub-Man Pithecanthropus
- The Three Giants, Phororhacos, Moa, Ostrich
- The Toxodon
- The Track of a Three-toed Dinosaur
- The walking-fish or mud-skipper (Periophthalmus)
- Thespesius, a Common Herbivorous Dinosaur of the Cretaceous
- Time-chart 6000 B.C. to A.D.
- Tooth of Mastodon and of Mammoth
- Triceratops - A Huge Extinct Reptile
- 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
- Where a Dinosaur Sat Down
- Young Hoactzins