 Heterocyathus hemisphaericus, basal view
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 Heterocyathus aequicostatus,lateral view
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 Heterocyathus hemisphaericus, calicular view
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 Heterocyathus aequicostatus, oblique view
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 Placotrochus laevis, series showing an anthocaulus with incipient fracture line, an anthocyathus still attached to anthocaulus, and a detached anthocyathus
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 Heterocyathus hemisphaericus, basal view
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