Aperture shape | Aperture, top, junction with previous whorl | Outer lip flared | Sculpture, axial, on last whorl | Sculpture, spiral, on last whorl | Shell proportions | Size in millimeters | Spire angle in degrees | Teeth / ridges / lamellae in aperture | Whorls, number of , range

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Number scored for a state is in green.

1. Size in millimeters

137Under 5    865 to 10    32210 to 25    58Over 25   

2. Shell proportions

252Taller than wide    304Wider than tall   



3. Spire angle in degrees

172Under 30    7730-60    5860-90    13790-120    127120-150    21150-180   







4. Aperture shape

3Bean    71Crescent    97Half-moon    176Oval or teardrop    147Round    88Taller than wide, top angle acute    35Teeth constrict aperture   








5. Whorls, number of , range

73Under 4    3174-6    1826-10    31Over 10   





6. Outer lip flared

246No    71Slightly    252Strongly   




7. Sculpture, axial, on last whorl

13Absent    345Growth lines only    231Ribs or grooves   




8. Sculpture, spiral, on last whorl

388Absent    146Cords   



9. Aperture, top, junction with previous whorl

89Acute    59None, detached    286Oblique    69Radial    77Tangential or almost so   






10. Teeth / ridges / lamellae in aperture

488Absent    60Present