Radiobrissus gneffensis Fourtau, 1913; Miocene, Egypt. Apical, oral and lateral views, with detail of petal, from Fourtau, R. 1913. Notes sur les Echinides Fossiles de L'Egypte. Bulletin de L'Institute Egyptien, 5, 62-71, pl 7. (plate 7, figs 4, 4a , b, c).
Length of test 36 mm.