— (1) Length about 1.45-2.25 mm. The slenderness is rather variable.
— (2) The shells are somewhat transparent, with a yellowish-gray colour. There is a weak colour pattern of darker yellowish spots on the body whorl. The top whorls are of the same transparency as the lower ones, but sometimes of a slightly lighter colour.
— (3) The ornamental sculpture of the body whorl consists of about 7 medium coarse and somewhat close-set spiral striae on the basis plus about 3 striae just below the suture. The spiral striae below the periphery may be slightly stronger than the other ones. At the periphery sculpture is weak or absent.
— (4) The shells are medium solid. There is a broad and flat labial rib. The aperture does not show any other peculiarities.
— (5) Large specimens have about 4.7 whorls.
— (6) The umbilical chink is weak or absent.
— (7) The dimensions of the apex vary: d = 0.09-0.10 mm, D = 0.15-0.18 mm.
— (8) Seen from aside in position 1, the nucleus is somewhat prominent and circumscribed by a medium deep suture. Seen from aside in position 2, the nucleus and first ¼ whorl form a medium high segment of a sphere with a medium deep suture.
— (9) At a magnification of 40 x , the surface of the top whorls is frosted, without manifest ornamental sculpture.

A detailed description was provided by VERDUIN (1988).
Shell studied by us fairly solid, large specimens with a little more than 4.5 whorls reaching up to 1.6 x 0.9 mm. The body whorl occupies between 70 and 75 % of the total height. Profile of the shell quite convex, although in some shells the upper part of the whorls can be somewhat flat. It has about fifteen somewhat uneven shallow furrows that delimit flat cords of similar width. These cords are more evident in the upper part of the whorls and in the basal area of the shell. Usually the furrows are not visible in the central part of the whorls. A thicker spiral cord in the upper third of the whorls causes a slight angulation. Suprasutural and subsutural cords also thicker leading a canaliculated suture. Shell whitish, semi transparent, with four bands of reddish spots in the body whorl, one subsutural more evident, two more diffuse in the middle, and the fourth at the base. Paucispiral protoconch of 1.5 whorls and about 320 µm (diameter of the nucleus slightly less than 100 µm). Ornamentation somewhat variable. There are irregular granules densely arranged all over the surface of the nucleus. On further whorls of the protoconch, the granules become aligned into spirals. In some protoconchs at first these granules are fused in a crude and irregular way, but towards the end of the protoconch they form about five irregular cords.

The shell profile and details of the sculpture of the protoconch of C. innominata show some variability and we cannot rule out that we are facing more than one species. This species has a resemblance to the Mediterranean species C. beniamina and C. ramosorum, but is larger than both, with a more convex profile and a more marked suture in C. beniamina, while C. ramosorum Oliver, Templado & Kersting, 2012, is more squat with the weakest sculpture. The sculpture of the protoconch it is also different in C. innominata.

Madeira and Canary Islands.