Brittle, plump, shell up to 3mm in length. It is cream in colour with yellow brown periostracum. The inside is dull white. The surface of the shell appears decussate due to radiating ribs crossed by concentric lines.
- Ribs are continuous over the shell surface
- Decussate effect on shell surface caused by more than 50 radiating ribs and about 40 concentric lines
Occurs in gravelly sand. It has only one siphon for expelling waste - water is taken in through the front of the shell. This species suspends itself by a single byssus thread.