| 11. | The outer lip is smooth, rarely denticulated, white and slightly sharp.
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| 12. | The posterior expansion of the flaring outer lip is always lower than the spire.
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| 13. | There is a callous tubercle at the junction of outer lip with the former.
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| 14. | The aperture broadly ovate and the outer lip is thin.
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| 15. | The shell contains 10 varix, indicating a previous resting stage with developed outer lip.
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| 16. | The outer lip is somewhat thicker at its margin and toothed on the inside.
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| 17. | The outer lip ( viewed laterally ) is obliquely incurved.
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| 18. | The outer lip is very thin, sharp and fragile.
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| 19. | The columellar plate is broad, passing into the expanded continuation of the outer lip above.
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| 20. | The outer lip is sharp, without fold or thickening.
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