It is provided with an oblique fold at its insertion.

It is marked by an inconspicuous oblique fold near its insertion.

It is reinforced for the greater part by the attenuated base and provided with a strong oblique fold at its insertion.

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

An oblique fold in front of the shoulder.

A short oblique fold or pit in front of the shoulder covered with small granular scales.

It bears a strong oblique fold a little anterior to its insertion.

It is provided with a strong oblique fold at its insertion.

The pillar has a broad, strong, oblique fold, a little anterior to its insertion.