- O'Dea, K.
- 1-22
- Oedipina (photograph)
- 3-2
- Oenothera lamarckiana
- 9-14-13
- Oguma, Dr. (photograph
- 1-44
- Oligochaeta
- 7-19
- Oliver, C.P.
- 3-3
- Oliver, J.H.
- 3-4 3-6 4-71
- Oliver, P.
- 3-3 3-24
- Omodeo, P.
- 3-33 3-47 4-63
- Ortiz, E.
- 3-3
- Orzack, S.H.
- 6-23
- Otiorrhynchus
- 7-21
- Otte, D.
- 3-5
- Oxford University
- 4-66
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