Shell short, conical, rather broad, very solid, white. The larval shell consists of 2.25 whorls, sculptured by fine spiral lines and its height is about 0.85 mm. The holotype has 2.8 postlarval whorls which are rather flat and sculptured by strong axial ribs; 11 ribs occur on the body whorl. There are also numerous irregular growth lines. The spiral sculpture consists of three often interrupted spiral lines on the upper whorls and two additional ones on the body whorl. The aperture is rather small with two large columellar folds and a strongly oblique outer lip.
Dimensions: height of the shell 7.6 mm, diameter 4.6 mm, height of the aperture 4.0 mm, breadth 2.1 mm." (Bouchet & Waren 1985: 260).
The largest shells from off Ireland measure 15.4 x 9.4 and 19.6 x 11.6 mm.

In shell form, B. azorica resembles B. nodosa; dimensions of both species have been compared graphically (Verhecken 2002: 513). The conical form of larger B. azorica shells resembles well that of B. decapensis. In form and sculpture, this species (and probably also B. decapensis when uneroded) rather well resembles a shell (dimensions not indicated) from Mozambique (Lussi in litt.) figured by Lussi et al. (2004: 7) under the incorrect name "Cancellaria" okutanii Petit, 1974.

Off the Azores, 1250-2220 m (4 specs, Bouchet & Waren 1985: 260); off NW Ireland, 2900 m (Verhecken 2002: 510).