1: shell height 19mm; 76% of breadth.
2: height of body whorl 72% of shell height so spire small.
3: height of aperture 41% of shell height.
4: shell breadth 25mm.
5: angle of peripheral keel about 100º.
6: flat sided whorl.
7: adapical angle of whorl.
8: adapical step of whorl.
9: apical angle about 100º.
10: deep suture.
11: obtuse adapical angle of aperture about 160º.

01 Gibbula magus. Large specimen, height (apex to base of shell) 25.5 mm, breadth 31.5 mm. Cardigan Bay, Wales. 2015.

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