Shell stout, short, white, spirally channelled, with about six whorls; spire short, whorls moderately rounded, apex rather blunt; nucleus small, depressed, glassy, smooth ; spiral sculpture of (between the sutures) about a dozen broad flattened cinguli separated by narrower channelled interspaces, and covering very equally the whole shell; there are also a few faint spiral striae, especially in the channelled interspaces near the aperture; transverse sculpture only of rather strong lines of growth, most evident in the channels. Suture very distinct; aperture elongate, arched, the outer lip thin, smooth, and hardly thickened inside; a little callus in the commissure and on the body and pillar; canal wide, very short, deeply notched, strongly twisted to the left; siphonal fasciole narrow but distinct, sharp-edged, producing false plaits under the columellar enamel; columella arched, its anterior edge sharply keeled. Operculum rather bluntly pointed. Max. Ion. of shell, 31.0 mm; of last whorl, 25.0 mm; of aperture and canal, 21.5 mm; max. lat. of shell, 20.0 mm; of aperture, 9.5 mm.

This shell is thin, and recalls Oocorys as well as Liomesus. The nearest relatives, conchologically, are Clirysodomus ventricosus Gray, from Newfoundland, which is a much larger shell with a strong epidermis and longer canal, and the fossil shells named Ptychosalpinx by Gill, in 1867, of which B. escheri Mayer and B. altile Conrad are types. The animal is pure white, and destitute of eyes. The tentacles are small, the proboscis extremely long; the verge is long, sigmoid, flattened, and has a small pointed process at the tip. The dentition resembles that of Chrysodomus (Mohnia) Mohni Friele (North Atlantic Exp., Report, Part I., plate v. fig. 14, 1882), but the teeth are wider, the laterals more arched, and it is certain that the rhachidian tooth has only one prong or cusp, while the laterals have no small denticles between the two terminal ones. If this specimen had not retained the soft parts I should have supposed it to be a Liomesus. The keeled columella is peculiar, though this feature is common to Liomesus, but the faint plait-like ridges above are merely the raised edges of the siphonal fasciole, showing through the enamel, and they disappear in adult specimens and are not present in some young ones.

Caribbic. Little Bahama Bank.