Specimen collected by TGW Fowler Coll from Dogger Bank. Length = 38mm.
<em>Musculus niger</em> (J E Gray, 1824)
LocalFrom the north of Norway to the south of Britain
Lives on muddy gravel bottoms where it filters phytoplankton.
Brittle shell up to 5cm in length. The shell is dark brown in colour but obscured by brown periostracum (tends to appear black in older specimens). The inside of the shell is pearly tinged with blue or brown. The surface is sculptured with obvious concentric lines crossed with ribs in the anterior and posterior regions. The margin of the shell is crenulate where the ribs are present but smooth elsewhere.