| 21. | The smooth nucleus consists of about one operculum is multispiral.
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| 22. | The operculum is white, thick, convex, and granose externally.
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| 23. | Their shell consists of few convex operculum being drawn in too far.
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| 24. | The aperture is subovate and the operculum is reddish brown.
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| 25. | The operculum is small, dark brown, multispiral, and chitinous.
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| 26. | The operculum is circular, light brown, multispiral, and chitinous.
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| 27. | The operculum is very thin with about 11 very faintly defined turns.
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| 28. | The multispiral operculum has an erect, calcified spiral lamella.
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| 29. | The operculum is multispiral with a thin, oblique lamella.
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| 30. | The operculum is attached to the rear top part of the foot.
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