| 21. | The morphology of the radula is related to diet.
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| 22. | Through this action the radula teeth are being erected.
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| 23. | The formula of the radula is 30 x 27 + 1 + 27.
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| 24. | The taenioglossan radula has seven teeth in each row.
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| 25. | The radula is taenioglossate . ( Thiele, 1925)
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| 26. | This appears to contradict the concept that the ancestral molluscan radula was mineralized.
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| 27. | The radula is unicuspid and the radular dentition is of the rhipidoglossate type.
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| 28. | Limpets scrape algae from rocks using radula equipped with exceptionally hard rasping teeth.
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| 29. | The Zemaciinae were distinguished from other subfamilies by the lack of a radula.
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| 30. | Verrill of medium size, but the radula shows marked and interesting differences.
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