Punctuated equilibria, morphological stasis and the palaeontological documentation of speciation: A biological appraisal of a case history in an African lake. In 8vo, offp., pp. 11. Offprint from Biological Journal of the Linnean Society 20. A recent study of a fossil sequence of molluscs in the Turkana basin throws new light on the history of African lake faunas. A confirmation of Gould & Eldredge punctuated equilibria.

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