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