Test turreted, flatly subcaudate, striate, angulata, longitudinally ciliate, columella subplicate. (Translation.)
Shell similar to B. undatum, but thin, paper-like, and destitute of folds, except short ones near the suture, so as to give that part a crenated appearance. The whorls are more concavely rounded, so as to be nearly cylindrical; surface with minute and close revolving lines, color yellowish or livid, most specimens with blotches, or dashes of brown; epidermis fawn-colored and hispid, with short hairs, arranged for the most part along the lines of increase. Aperture short, rounded, lip very thin; throat pure white, or yellowish. The pillar has a very oblique, obscure fold. (Gould: Report on the Invertebrates of Massachusetts.)
TYPE in Copenhagen Zoological Museum. Type locality, Arctic.
RANGE. Point Barrow, Arctic Ocean, to Aleutian and Shumagins; and on the Atlantic from Greenland to the Newfoundland Banks. Fossil: Montreal.