Cylichnoides occultus: Cylichna occulta: Shell solid, white, covered with a very thin, whitish-yellow epidermis; ovate, rather short and swollen, the diameter about two-thirds the altitude. Vertex obtusely truncated, slightly concave in the middle; base rounded aperture not very narrow, dilated below, the outer lip projecting above the crown of the shell, a little arcuate and inflexed in the middle; columella nearly straight, with a broad fold. Surface smooth, polished, shining, but covered with many impressed undulating lines, which are quite conspicuous.

Cylichnoides occultus: Cylichna occulta: Point Barrow, Aleutian Islands; circumboreal.