Length, 13.5; breadth, 1.3 mm. (Whiteaves)

Shell slender, moderately but distinctly curved, large and much elongated for the genus, increasing very slowly but regularly in diameter, not distinctly (if at all) swollen in advance of the middle, and very slightly and scarcely perceptibly constricted immediately behind the aperture. Testa extremely thin, surface polished, very glossy and shining, smooth to the naked eye, but under a lens it is seen to be marked with minute and transverse but somewhat oblique lines of growth.

Quatsino Sound. Catalina Island California.

TYPE in Ottawa. Type locality, Quatsino Sound, British Columbia.