Shell small, similar to the last species (C. brunneus) in general characters, but covered with a grass-green epidermis, tinged with livid brown in some specimens. The canal is more clearly defined, the aperture much shorter and rounder, the ridges and grooves less prominent and clearly defined. The costae are more arcuated posteriorly, and the embryonic whorl larger, with revolving threads, instead of being smooth. Whorls five and a half. Costae, nine to eleven on the last whorl; ridges more numerous than in the last species, but almost too faint to count. Length, .65; width, .34; canal and aperture, .37; spire, .3; width of aperture, .17; length without the canal, .18 in. (Dall.)
TYPE in United States National Museum. Type locality, Kyska Har¬bor, in 10 fathoms.
RANGE. Bering Sea to Middleton Island, Alaska.

Aleutan Islands. Kyska Harbour.