Smith, A. B. & Wright, C. W. 1996. British Cretaceous echinoids. Part 4, Stirodonta 3 (Phymosomatidae, Pseudodiadematidae) and Camarodonta. Monographs of the Palaeontographical Society 150 (602), 268-341.
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Smith, A. B.; Wright, C. W.
1996
British Cretaceous echinoids. Part 4, Stirodonta 3 (Phymosomatidae, Pseudodiadematidae) and Camarodonta