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Pourtalesia jeffreysi, Wyville Thomson.
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Ceratophysa ceratopyga / upper right: oral view, lower left: lateral view, (after A. Agassiz, 1881).
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Echinocrepis cuneata / left: apical view, right: lateral view, (after A. Agassiz, 1881).
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Helgocystis carinata / upper view: oral side, lower view: lateral side, (after A. Agassiz, 1881).
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Pourtalesia aurorae / left: apical view, right: oral view.
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Pourtalesia debilis / left: apical view, right: oral view, (after Koehler, 1926).
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Pourtalesia hispida / left: apical view, right: oral view.
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Spatagocystis challengeri / left: apical view, right: oral view, (after A. Agassiz, 1881).