In general features like that of E. fissura but thinner and sometimes shinier. The beak is more pronounced and projects back more markedly, in apical view lying almost or quite over the posterior margin of the shell or even beyond that. This results in the anterior profile being more convex and the posterior more concave than in fissura, in many shells the former making an almost perfect quarter circle with the posterior margin of the aperture as centre. The beak also lies further below the highest point of the shell, its height 70-75% of the total height. The sculpture of the shell is like that of fissura though the regular alternation of larger and smaller ridges is often not apparent in the anterior half of the shell. The major ridges number 35-40 and are about equal in breadth to the intervening furrows. They are crossed by about 20 narrower ribs, producing a very clear cancellation of the surface which to the naked eye appears rounder than the square areas of fissura. Small spines sometimes project at the crossing places of ridges and ribs. At high magnification each depression is seen to contain 2-4 rounded areas each with a deep pit. The slit is equal to about 1/5 of the distance from shell edge to beak; slit band marked with rather distinct transverse lines.
Aperture oval, the lip more, and more regularly, sinuous than in fissura because of the character of the ridges.
Colour. Outside, white or grey, often tinged with pink, frequently dirtied or stained; inside, nacreous, shiny, white or brownish yellow with lighter glistening areas under the slit band and points of intersection of ridges and ribs.
S/y:up lo6x4x4mm. Height = 50-60% of length; breadth = 70-75% of length.
Animal much as in fissura. The epipodial tentacles are more numerous — 24-28 round the foot with one behind the right eye stalk. The dorsal fold of the mantle edge is drawn out into rounded lobes neatly lodged in the bays of the shell edge; the ventral fold forms a smooth shelf projecting into the mantle cavity.
Colour. White.
Food. Presumably also a sponge eater. Faeces like those of fissura.
Breeding. Unknown. Sexes separate. Gametes broadcast and fertilized externally.
Collecting. May be found by sorting through dredgings off SW coasts of England. Diving might offer better chances.

Characteristic of this species is ratio height/width equal to one and the remarkable bending of apex overflowing from posterior margin. Even the peculiar sculpture makes it easily recognizable from its similar ones. It is made by solid axial ribs crossed by concentric little cords as many evident, giving a reticulated aspect to surface. Unique similar species is E.fissura that, besides reaching larger sizes and having a deeper habitat, is recognizable since it is more conic in outline, with apex subcentral and sculpture weaker. Also juvenile specimens are easily recognizable being conic in aspect and due to their solid axial ribs.
Uniform dirty white in colour. Internal of shell, pink in colour, resulted to be quite rare in the imaged shells we examined. Due to different authors' interpretations meant to separate the Atlantic form from the Mediterranean one, this species has a lot of synonyms at last gathered under taxon E. rosea. Average measures of adult specimens are around 6x5x5 mm.

Geographical distribution. A southern species, found on the N. coast of France, Channel Islands, Isles of Scilly, Cornwall, Devon; there is also one record each from the Fleet, Portland, Dorset and the Isle of Arran, Firth of Clyde. Absent from Ireland, E. Channel, N. Sea and coasts of Scandinavia.
Habitat. A sublittoral animal, trawled on rough stony or shelly grounds 12-28m deep presumably extending up to LWST since the specimen

Habitat: mainly it lives in the circalittoral zone but it is often collected in the infralittoral zone too.
Distribution: it is found all over the Mediterranean. Uncommon. Radular comparison between Atlantic and Mediterranean specimens sets up it deals with an unique entity.