| 31. | The siphuncle is tubular, typically found near the venter.
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| 32. | Siphuncle segments have short septal necks and thick connecting rings.
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| 33. | Actinosiphonate deposits in the siphuncle are confined to early part of phragmocone.
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| 34. | The siphuncle is central to subcentral with moderately to strongly inflated segments.
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| 35. | The siphuncle is ventral and is in contact with the shell wall.
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| 36. | The siphuncle is central with moderately expanded, spindle-like segmeents.
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| 37. | Sutures are generally straight, the siphuncle ventral, empty.
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| 38. | The siphuncle is ventral, near the outer, externally convex curvature.
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| 39. | The siphuncle, which is ventrally submarginal, contains laminar actinosiphonate deposits.
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| 40. | The siphuncle is ventral, diaphragms are rather common.
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