 Premocyathus compressus, lateral view
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 Premocyathus dentiformis (Pourtalès, 1868), side of calice.
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 Premocyathus compressus, calice of specimen with 7 pali
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 Premocyathus dentiformis, side view
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 Premocyathus dentiformis,calicular view
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 Premocyathus compressus, calice of specimen with 7 pali
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 Premocyathus dentiformis (Pourtalès, 1868), calicular view.
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 Premocyathus dentiformis, specimen showing regeneration from basal region
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 Premocyathus dentiformis, calicular view
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 Premocyathus compressus, side view showing thecal crest on convex edge.
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 Premocyathus compressus, calicular view
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 Premocyathus dentiformis, basal view
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