Clark, H. L. (1925). Echinoderms from the South African Fisheries and Marine Biological Survey, Part I: Sea-Urchins (Echinoidea). Fisheries and Marine Biological Survey Report. 4: 1-16.
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Clark, H. L.
1925
Echinoderms from the South African Fisheries and Marine Biological Survey, Part I: Sea-Urchins (Echinoidea)