Figures

Figure 15.12   Echinoid life modes: (a) transition from the sea urchins through the heart urchins to the sand dollars; (b) habits and modes of life of echinoids. (a, based on Kier, P. 1982. Palaeontology 25; b, based on Kier, P. 1982. Smithson. Contr. Paleobiol. 13.)

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