| 31. | The aperture is not modified in form by the preceding whorl.
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| 32. | Its synthetic aperture radar has a resolution of 3m-50m.
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| 33. | The Aperture is obliquely ovate with a single distinct columellar fold.
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| 34. | This was prior to the advent of automatic electronic aperture devices.
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| 35. | The aperture is narrow and may be constricted towards the rear.
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| 36. | The height of the aperture is 14.7 15 mm.
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| 37. | The color inside the aperture shows various shades of pale brown.
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| 38. | The blunt smooth protoconch contains about one aperture but deeply cut.
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| 39. | The body chamber in the adult is contracted toward the aperture.
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| 40. | The aperture is ovate and entire with the peristome incomplete behind.
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