1. Simpson, G. G., Bull. Amer. Mus. Nat. Hist., 85, 1 (1945).
2. Maberly, C. T. A., Animals of East Africa (Howard Timmins, Cape Town, 1960).
3. Buettner-Janusch, J., Folia Primat., 1, 73 (1963).
4. Parker, W. C., and Bearn, A. G., Ann. Human Genetics, 25, 227 (1961).
5. Schmitt, J., Biochem. Z., 333, 71 (1960).