Diagnosis: Shell broadly claviform (b/l 0,45. a/l 0,39). body whorl rather oblong-quadrate, apex moderately blunt, base short, slanting slightly to right; suture not undulating; whorls weakly convex, without angle or shoulder, slightly swollen below suture; fasciole feeble; siphonal canal relatively short and rather wide, labrum medially flattened; columella straight; parietal nodule moderately small, laterally compressed, slightly constricting anal sinus, which is deep, rather wide and asymmetrical, its lower border not alate, stromboid notch very slight; axial ribs thin, very low, weakly reversed-sigmoid. suture-to-suture but very weak on shoulder slope. 17 ribs on penultimate whorl; low spiral threads overall, about 18 on penultimate whorl; body whorl with weak, broad varix behind lip; surface dull, uniform light brown. Protoconch narrowly domed; breadth 1,13 mm. Attains 8,9 mm.
Description: Shell small, somewhat broadly claviform (b/l 0,45, a/l 0,39) with subcylindrical body whorl and fairly blunt apex, rostrum moderately short, base slanting somewhat to right, rather squarely truncate; teleoconch whorls 4, suture rather shallow; whorls rather weakly convex, not shouldered, periphery slightly below mid-whorl, very slightly concave above periphery, slightly swollen below suture, but without a definite subsutural cord; left side of base of body whorl only slightly concave, with a faint fasciole. Aperture oblong, greatest width median, labrum flattened medially, columella almost straight, parietal region concave, siphonal canal short, very broad, moderately shallow, oblique and slightly tapering, its termination shallowly indented dorsally; labial callus moderate, outer edge slightly free on columella, parietal nodule moderately small, laterally compressed, continuous with labrum, slightly constricting entrance to anal sinus; labrum fairly strongly convex in side-view, with a feeble stromboid notch and deep, moderately wide and asymmetrically U-shaped anal sinus, which is directed outwards, its lower border not alate.
Sculptured by thin, low, more or less suture-to-suture axial ribs, crossed by low but distinct spiral threads; growth-lines somewhat coarse, pliculate in places; body whorl with a broad but weak prelabral varix, overridden by the axial sculpture. Axial ribs somewhat irregular in places, weakly reversed-sigmoid, opisthocline, weak and strongly recurved below suture, on body whorl extending to columellar parietal junction, more or less equal to intervals, crests sharply rounded, sides gradually sloping; 1st whorl with 14 ribs, penultimate whorl with about 17. Spiral threads 6 on 1st whorl, where equal in strength; on penultimate whorl about 18, those on shoulder slope fine, except for the 2nd thread below suture which is angular; base of body whorl with 22 threads, those on rostrum relatively coarse, widely spaced and somewhat declivous.
Colour uniform light brown. Protoconch narrowly domed, of about 2 whorls, initially small and depressed, 2nd whorl moderately convex, smooth except for growth-lines and about 6 spiral striae near termination, lip strongly arcuate, opisthocline; breadth 1,13 mm, height 1,05 mm (b/h 1,08). Dimensions: 8,9 x 4,0 mm (holotype).

The unique holotype somewhat resembles C. falcicosta (Barnard, 1958), but has a more oblong-quadrate body whorl and stronger spiral threads which cover the entire whorl.

South-Africa. Continental shelf of eastern Transkei.