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SEM images of typical spirorbid shells from specimens in the trials. (a) Spirorbid shells at end of trials held in ambient pH (7.9); (b) spirorbid shell remains at end of trials held at low pH (7.7); (c) high magnification view of spirorbid shell structure from low pH (7.7) treatment showing loose matrix of randomly aligned prisms. Scale bars a = 200 μm; b = 500 μm; c = 2 μm.
