| 1. | Growth lines outline a ventral hyponomic sinus but are otherwise transverse.
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| 2. | A fair degree of mobility is indicated by the deep hyponomic sinus.
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| 3. | The hyponomic sinus, through which the funnel projects, appears to be trilobate.
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| 4. | Growth lines indicate a shallow hyponomic sinus.
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| 5. | The aperture is without a hyponomic sinus.
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| 6. | The hyponomic sinus, observed in some, indicates active, directionally controlled hydro-jet propulsion.
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| 7. | Growth lines show a broad crest on either side that swings forward above the ventral hyponomic sinus.
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| 8. | Growth lines are fine, forward slanting, concavo-convex; indicate well developed ventrolateral salients and hyponomic sinus.
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| 9. | Shells are depressed, irregularly annulated cyrtocones with V-shaped hyponomic sinuses, ornamented by longitudinal and transverse ridges.
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| 10. | Apertures vary from round to T-shaped, with a long narrow, ventral, hyponomic sinus for the maneuvering funnel.
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