| 1. | The shell is rather evolute, whorl section circular to oval.
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| 2. | The evolute will have a cusp at the center of the circle.
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| 3. | It is nearly identical in form to the evolute of an ellipse.
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| 4. | The cusps in the green curve are on the evolute.
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| 5. | These are the points where the curve touches the evolute.
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| 6. | Whorls are strongly depressed, but still evolute in coiling.
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| 7. | "Zaraiskites " has a ribbed evolute shell without tubercles.
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| 8. | The shell is evolute with only a slight overlap of previous whorls.
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| 9. | The shell is evolute, coiled such that all whorls are exposed.
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| 10. | The evolute of a circle is therefore a single point at its center.
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