Musculus niger (J.E. Gray, 1824)
Up to 50 mm in length.
Shell light tan to deeper brown, with a paler greenish area ventrally between the two ribbed areas; periostracum light brown or olive to deep brown or almost black in large specimens.
Occurs offshore, on sandy mud and fine gravel.
To 200 m.
Separate sexes; pelagic larvae.