| 41. | "' Aphelaeceras " is evolute, compressed, with a wide umbilicus and small dorsal impression.
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| 42. | They have a shell morphology that is mostly evolute, typically with biplicate, simple, or triplicate ribbing.
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| 43. | The shell of " Maccoyoceras " is evolute, volutions only slightly impressed, whorl section hexagonal.
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| 44. | Because the evolute of the nephroid is another nephroid, so the involute of the nephroid is also another nephroid.
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| 45. | The shell is discoidal, primarily evolute, becoming mildly involute in later growth stage, moderately to rapidly expanding.
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| 46. | The caustic formed by spherical aberration in this case may therefore be described as the evolute of a Cartesian oval.
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| 47. | "Encoiloceras " has an evolute shell with a wide umbilicus and large umbilical perforation in the middle.
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| 48. | Shells are evolute, tuberculate and ribbed, with subquadrate to squarish whorl section wherein tubercles typically dominate over ribs.
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| 49. | In particular, if the object has an ellipsoidal cross-section the Arago spot has the shape of an evolute.
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| 50. | The line " YR " is normal to the curve and the envelope of such normals is its evolute.
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