1. a National Museum , P.O. Box 266, Bloemfontein, 9300, South Africa
2. b Department of Oceanography , University of Port Elizabeth , P.O. Box 1600, Port Elizabeth, 6000, South Africa
3. c Department of Zoology , University of the Witwatersrand , Johannesburg, 2001, South Africa
4. d P.O. Box 54, Newlands, 7725, South Africa
5. e 20 Crouch Hall Road, London, N8 8HX, United Kingdom
6. f P.O. Box 54, Newlands, 7725, South Africa
7. g P. O. Box 54, Newlands, 7725, South Africa
8. h Firle , P.O. Box 44, Mooi River, 3300
9. i Department of Mathematical Statistics , University of Cape Town , Rondebosch, 7700