The columella is arcuate, covered with a thin callosity. The columellar lip has a median callosity. The columella is nearly straight, covered by the inner lip which forms a callosity. Consistent callosity patterns ensured it was the same animal. Some specimens lack the rose-coloured line round the umbilical callosity. These ulcers start with callosity under which suppuration takes place. The edge of the callosity is always of a more or less deep orange color.