The parietal wall is provided with a thin callus.
The parietal wall is covered with a fairly strong callus.
The parietal wall is closed by a very thin callus.
The parietal wall is covered by a thin film of callus.
The parietal wall is covered by a thin translucent callus.
The parietal wall and the outer lip are thickened internally.
The angle of the parietal wall varies, but no precise information on this has been compiled.
The parietal wall is covered by a very strong callus.
The parietal wall is glazed with a very thin callus.
This fold on the parietal wall is characteristic for this species.