The gill attached to the left side lies across the top of the body just within the mantle edge.

It has a thin blue or purple line on the mantle edge.

The mantle edge secretes a shell which has two components.

Dark upperparts; brown with grey mantle edges; plump bill base.

The mantle edges are fringed with white and are fused together.

A pallial tentacle arises from the mantle edge on the right.

The upper dorsum is also often marked with light blue streaks near the mantle edge.

The mantle edges are well extended along the body, with a thin bluish border.

There are red dots in a circular pattern on its dorsum next to the mantle edge.

Its mantle edge is usually white, sometimes dotted with black spots.