(from Coe, W. R. (1901). Papers from the Harriman Alaska Expedition. XX. The nemerteans.. Proc. Wash. Acad. Sci.. 1-110.)
Head with deep, horizontal furrows. Proboscis usually with three muscular layers and muscular crossings. Caudal cirrus absent. Body long and slender, rounded or flattened; very contractile.
A single row of 4-6 (or sometimes 8) ocelli on each side of head. Dusky, or brownish green, dark brown, or reddish brown; commonly paler beneath.