RJA thanks the Deutsche Forschungsgemeinschaft (AS 245/2-1) and a UK-South African Research Network grant from the Royal Society and South African National Research Foundation (to RJA and Nigel Bennett of the University of Pretoria). RJA also thanks the European Commission's Research Infrastructure Action via the SYNTHESYS Project (SE-TAF 4069). For comments on the manuscript,
we thank two anonymous reviewers and T. Shawcross and S. Leonard at Trinity Hall, Cambridge. For hospitality and access to collections we thank N. Bennett and T. Kearney in Pretoria; D. Hamerton, D. Stynder and K. van Willingh in Cape Town; L. Thibedi in King Williams Town; E. Mbua in Nairobi; O. Grönwall, P. Erikson, and B. Kajrup in Stockholm; R. MacPhee and E. Westwig in New York.