| 11. | All species in this genus have sinistral or left-coiling shells.
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| 12. | Whorls are strongly depressed, but still evolute in coiling.
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| 13. | The shell is sinistral in coiling and has 8 or 9 whorls.
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| 14. | In normal coiling you introduce a twist with each loop.
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| 15. | Coiling this way imparts a twist to the rope.
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| 16. | All planorbids have sinistral or left-coiling shells.
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| 17. | Like all other planorbids it has a sinistral or left-coiling shell.
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| 18. | Coiling is eccentric, a character of the family.
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| 19. | Vessels were formed by coiling the plaster around baskets.
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| 20. | Coiling it up decreases its ability to dissipate heat.
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