| 41. | The spire is conic with operculum is nearly round with an excentric nucleus.
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| 42. | On the underside of the operculum the larva spins a mat of silk.
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| 43. | The operculum is unguiculate, with an apical nucleus.
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| 44. | The operculum is oval, light brown within, with a sublateral nucleus.
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| 45. | The operculum is oval, with a submarginal nucleus.
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| 46. | The operculum is flat inside, with five whorls and a subcentral nucleus.
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| 47. | The operculum is rounded oval, with four whorls and a subcentral nucleus.
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| 48. | The operculum is flat and brown inside with four whorls and subceutral nucleus.
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| 49. | The circular operculum is flat or slightly concave within.
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| 50. | The diameter of the operculum is about 13 mm.
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