The Echinoid Directory
Tiaromma michelini (Agassiz & Desor, 1846). Cenomanian, Upper Cretaceous. Camera lucida drawings of ambulacral zone, apical disc, perignathic girdle and three ambulacral plates, from Smith, A. B. & Wright, C. W. 1993. British Cretaceous Echinoids. Part 3, Stirodonta 2 (Hemicidaroida, Arbacioida and Phymosomatoida, part 1). Monograph of the Palaeontographical Society (publication no. 593, part of vol. 147), 199-267, pls 73-92.