Shell is solid, oval conical, with five or six slightly tumid whorls. Sculpture of fine prosocline growth lines, with slight, strap-like spiral striae visible mainly below sutures on spire and toward base of the last whorl. Aperture is oval, with thickened peristome; outer lip arises tangential to the last whorl; inner lip is reflected over umbilical groove and basal area of the last whorl; umbilicus is absent.
Up to 3 x 1.6 mm.
Whitish or buff with two rows of red-brown, comma-shaped marks on the last whorl.
Body similar to Manzonia crassa , though with a short pallial tentacle on left and a longer one on right; metapodial tentacle is trilobed, opercular lobes are yellow.
Gregarious. Below stones, in fine weeds and in silted areas of rock pools below MTL; extends sublittorally to 100 m.
Distributed from Mediterranean to Norway (Distr. C. semistriata).