Smith, A. B. & Wright, C. W. 1993. British Cretaceous echinoids. Part 3, Stirodonta 2 (Hemicidaroida, Arbacioida and Phymosomatoida, Part 1). Monographs of the Palaeontographical Society 147 (593), 199-267.
176092
Smith, A. B.; Wright, C. W.
1993
British Cretaceous echinoids. Part 3, Stirodonta 2 (Hemicidaroida, Arbacioida and Phymosomatoida, Part 1