| 41. | The last whorl is slender and, in apertural view, the outer lip continues the profile of the spire.
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| 42. | The outer lip is smooth within,
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| 43. | The type specimen has 12 or 13 ( the first is probably lost ) outer lip is thin.
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| 44. | A fourth complex consists of species with small, turbinate shells, strongly sculptured with the outer lip serrate or undulating.
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| 45. | Outer lip thin and fragile instead of strongly thickened, columellar tubercle more of a spiral twist than a tooth.
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| 46. | The outer lip is strongly re-enforced within by a callus which bears about 15 denticulations on the inner surface.
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| 47. | The white shell is slightly and irregularly marbled with pale brown, between the ribs and especially behind the outer lip.
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| 48. | Noticeable is the complete absence of a flared outer lip; juvenile shells have a simple sharp conical or biconic outline.
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| 49. | It passes imperceptibly into the outer lip, and is united above with the latter by a very thin white callus.
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| 50. | To the outer lip of the superior border, on either side, the buccinator is attached as far forward as the first molar tooth.
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