 Concentrotheca laevigatus (Pourtalès, 1871), calicular view of very young specimen with concentric theca visible in calice.
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 Concentrotheca laevigatus (Pourtalès, 1871), specimen of large size.
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 Concentrotheca laevigatus (Pourtalès, 1871), basal fracture of a smaller size specimen, showing concentric theca rings
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 Concentrotheca laevigatus (Pourtalès, 1871), longitudinal section showing walls at base of concentric theca.
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 Concentrotheca laevigatus (Pourtalès, 1871), calicular view.
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 Concentrotheca laevigatus (Pourtalès, 1871), calicular view.
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