Shell of moderate size, rather slender, with acute apex, sculptured with fine wavy striae, the interspaces between which are usually flat, but occasionally rise above the general surface as flattened threads. Junior whorls with seven to nine faint, very oblique transverse costae, the prominence of which varies in different specimens. Epidermis very thin, smooth, dehiscent. Color whitish, painted with oblique reddish-brown flammules, irregularly distributed in patches transverse to the whorls. Columella twisted with a strong fasciole, lightly glazed; outer lip smooth, entire, slightly thickened, white on the edge, orange-yellow within, extending a little in advance of the columella. Apex rather acute, suture appressed; whorls seven, regularly tapering, not inflated. Length, 2.18; width, 2; length of aperture, 1.05 in. (Dall.)
TYPE in United States National Museum. Type locality, Aleutian Islands.
RANGE. Aleutian Islands, eastward to Bristol Bay and Kodiak Island, Alaska.
Figure 9 is form tricarinatum Dall, not described.