Colus trophius: Shell of moderate size, short, white, with a pale olivaceous periostra¬cum with more than five well-rounded whorls, the apex eroded; suture distinct, not appressed; axial sculpture of faint concavely arcuate incre¬mental lines; spiral sculpture of (on the penultimate whorl, about a dozen) sharp, narrow, channeled grooves, with considerably wider flat interspaces, which, on the last whorl, are more or less divided by a shallow median groove; this sculpture is practically uniform over the whole sur¬face ; aperture wide, simple, white within; outer lip slightly reflected, thin, body erased; pillar short, straight; axis pervious. Height of shell, 32; of last whorl, 26; of aperture, 21; diameter, 19 mm. (Dall.)
TYPE in United States National Museum, No. 122628. Type locality, United States Fish Commission Station 3071, in 685 fathoms, off Sea Lion Rock, Washington.
RANGE. Eastern Bering Sea to Pribilof Islands to San Nicolas Island, in 1,100 fathoms.