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