| 31. | The radula has the teeth in about 48 rows.
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| 32. | The radula consists of numerous rows of delicate teeth.
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| 33. | All species have a radula and gizzard plates.
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| 34. | On the right is an illustration showing the operation of the radula in mollusks.
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| 35. | The first bilateral teeth is tricuspid in radula.
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| 36. | The radula, when present, has two or three teeth in a row.
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| 37. | Central tooth of radula is bicuspidate, laterals are unicuspidate and marginals are tricuspidate.
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| 38. | The radula is as usual in the Helicidae.
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| 39. | The radula is broad and generally rather short.
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| 40. | A radula has been found in one species, with seven teeth per row.
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