The shell of Pommerhelix monacha is subglobose (almost round).
The shell has 5.6–6.0 whorls.
The color of the shell is dark brown to black, but it can also be dark red or purple in colour.
The shell sculpture consists of zigzag ridges combined with small ridges on the periostracum.
The umbilicus is closed.
The aperture is roundly ovate in shape.

The width of the shell is 26.2-30.3 mm.
The height of the shell is 18.1-23.2 mm.

The visible soft parts are a yellowish grey in colour: the body is grey to dark grey and the mantle is dark yellow or orange.
The shell of Pommerhelix monacha is subglobose (almost round). The shell has 5.6–6.0 whorls. The color of the shell is dark brown to black, but it can also be dark red or purple in colour. The shell sculpture consists of zigzag ridges combined with small ridges on the periostracum. The umbilicus is closed. The aperture is roundly ovate in shape.
The width of the shell is 26.2-30.3 mm. The height of the shell is 18.1-23.2 mm.
The visible soft parts are a yellowish grey in colour: the body is grey to dark grey and the mantle is dark yellow or orange.
Pommerhelix monacha