| 11. | The surface ( periostracum ) is glossy with regular concentric ribbing.
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| 12. | The U shaped body chamber has coarser ribbing and large tubercles.
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| 13. | It has irregular ribbing on its shell and an irregular margin.
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| 14. | The Guides Special models are Cruisers that have close-ribbing.
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| 15. | The inner whorls are slightly oval-shaped with prominent ribbing.
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| 16. | "In the ribbing, " he says, finally.
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| 17. | Will that be OK ?'I deserved the ribbing.
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| 18. | And the ribbing didn't stop with the Rockets'rookie.
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| 19. | There are times when his good-natured ribbing backfires.
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| 20. | The jokes and ribbing are all part of the game.
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