06 Gibbula magus. Height 19 mm, breadth 25 mm. Cardigan Bay, Wales. 2015.

06 Gibbula magus. Height 19 mm, breadth 25 mm. Cardigan Bay, Wales. 2015.

Right: large conical umbilicus exposes entire interior of columella.
Left: wide comma-shaped groove leads into umbilicus.

Green algae on base of shell is protected by body and wide epipodium from abrasion by sand when animal moves.
Circular spiral operculum with many narrow coils, transparent horn colour, darkening with age/growth; pale opercular disc visible through it.

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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