1. Hickling, C. F., Nature, 161, 748 (1948).
2. Copley, Hugh, Review of Kenya Fisheries (1947).
3. Vaughan Jones, T., Game and Tsetse Control Dept. Ann. Rep. 1944.
4. Union of South Africa, Inland Fisheries Dept., Ann. Rep. 1944.
5. Huet, M., Actes du Congrès Limnologique, Suisse 1948 (in the press).