| 11. | Growth lines outline a ventral hyponomic sinus but are otherwise transverse.
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| 12. | Sculpture consists only of growth lines, sometimes with delicate spiral ornamentation.
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| 13. | Growth lines are usually biconvex, forming ventral and lateral sinuses.
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| 14. | The shell is surface smooth, covered merely by growth lines which form two salients.
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| 15. | The external surface is smooth, ornamented only by growth lines.
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| 16. | The shell itself bears short radial ribs, sinuous growth lines, and prominent longitudinal striae.
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| 17. | The shell is coarsely ribbed and contains growth lines.
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| 18. | Growth lines are fine, forward slanting, concavo-convex; indicate well developed ventrolateral salients and hyponomic sinus.
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| 19. | In the intervals of the longitudinals and parallel to them are very faint growth lines.
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| 20. | Let's see how the revenue growth line comes along,"
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