- Oliva, 554
- Ootype, 660
- Operculina, 594
- Operculum of gastropods, 521
- Oppel, A., 88
- Optimum temperature, 110
- Orbitolites, 605
- Orbulina, 59, 225, 257, 587, 598, 604, 607
- Organs, growth of, 88
- Orthagoriscus, 751, 775, 777
- Orthis, 561, 567
- Orthoceras, 515, 548, 551, 556, 579, 735
- Orthogenesis, 549
- Orthogonal trajectories, 305, 377, 400, 640, 678
- Orthostichies, 649
- Orthotoluidene, 219
- Oryx, horns of, 616
- Osborn, H. F., 714, 727, 760
- Oscillatoria, 300
- Osmosis, 124, 287, etc.
- Osmunda, 396, 406
- Ostrea, 562
- Ostrich, 25, 707, 708
- Ostwald, Wilhelm, 44, 131, 426; Wolfgang, 32, 77, 82, 132, 277, 281
- Otoliths, 425, 432
- Ovis Ammon, 614
- Owen, Sir R., 20, 575, 654, 669, 715
- Ox, cannon-bone of, 730, 738; growth of, 102
- Oxalate, calcium, 412, 434
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