Brittle shell up to about 1.5cm in length. The right valve is slightly larger than the left. Both inside and outside of shell is white. The surface of the shell is sculptured with fine concentric lines (?and irregular concentric undulations). The pallial sinus is deep.
Key identification features
- ?Chondrophore not projecting beyond dorsal anterior line
Ecology and behaviour
Lives attached by byssus threads in crevices or holes bored by other molluscs or within Laminaria holdfasts.