It is provided with a strong fold a little anterior to the umbilicus.

It is provided with a strong fold at its insertion.

It is provided with a well-developed fold at the insertion of the columella.

It is provided with a strong fold a little anterior to its insertion.

It is provided with an obsolete fold at its insertion.

The columella is provided with a strong fold at its insertion.

The columella is slender, slightly reflected, and provided with a fold at its insertion.

It is reinforced by the base and provided with a strong fold at its insertion.

It is provided with a weak fold some little distance anterior to its insertion.