There are nine, very shallow indentations along the posterior edge of the test.

The large mouth extends back to or past the posterior edge of the eye, and is angled upwards.

A white postocular stripe runs down and back from the posterior edge of the eye.

The female species posterior edge is distinct and U-shaped.

There is a black line on the posterior edge of the rhinophores, which have a semitransparent film raised around them.

It has two rounded projections on the posterior edge of the shell, and is slightly keeled.

The ventral fins are white and the tail has a dark posterior edge.

Its anterior border attaches to the posterior edge of the buccinator.

However, the vitreous base may have an irregular posterior edge.

The white line starts back from the eye spots and ends just before the border of the posterior edge.