1. Le Gros Clark, W., Antecedents of Man (Edinburgh University Press, Edinburgh, 1959).
2. Gregory, W., Mem. Am. Mus. Nat. Hist., 3, 49–243 (1920).
3. Napier, J., and Davis, P., Foss. Mamm. Afr., 16 (1959).
4. Conroy, G., Contrib. Primat., 8, 1–134 (1976).
5. Fleagle, J., Simons, E., and Conroy, G., Science, 189, 135–137 (1975).