| 31. | The suture has a faint ventral saddle and shallow lateral lobes.
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| 32. | Sutures are straight and oblique, sloping dorsoventrally toward the apex.
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| 33. | Sutures have dorsal and lateral lobes and umbilical and ventral saddles.
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| 34. | The whorls are excavated above and somewhat margined at the suture.
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| 35. | The skull is well ossified, with tight sutures between bones.
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| 36. | There are faint furrows at the sutures that enclose these tubes.
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| 37. | The suture has a narrow ventral lobe and broad lateral lobes.
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| 38. | Nasals semidivided, the suture proceeding from the first upper labial.
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| 39. | Sutures form shallow lobes on the venter, flanks and dorsum.
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| 40. | Suture simpler than in the similar " Ataxioceras ".
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