— (1) The length varies from about 1.0 to 1.6 mm.
— (2) The shells are rather transparent with a light brown hue. They are decorated with darker brown spiral bands. Occasionally, the subsutural band may be missing. There is always a brownish area at the umbilical chink. All colour bands end at some distance from the aperture. There is a whitish spot at the apex.
— (3) Ornamental sculpture is completely absent.
— (4) The shells are not very solid. There is no labial rib, nor does the aperture show any other peculiarities.
— (5) Large specimens have about 4.5 whorls.
— (6) There is a weak umbilical chink.
— (7) The dimensions of the apex vary: d = 0.10-0.13 mm, D = 0.18-0.20 mm.
— (8) Seen from aside in position 1, the nucleus is little prominent and circumscribed by a shallow suture. Seen from aside in position 2, the nucleus and first lA whorl form a rather low segment of a sphere, circumscribed by a shallow suture.
— (9) At a magnification of 40 x , no ornamental sculpture can be seen on the protoconch.

E. cossurae is washed ashore regularly along the entire western Mediterranean, in Sicily and in the Adriatic Sea.