Shell conical, moderately solid, as high as broad or slightly broader than high, to 8.7 mm high X 8.9 mm broad. Protoconch as in genus. Teleoconch up to 5-6 whorls. Spire sculptured with distinct beaded spiral cords, as wide as interspaces, one of which running beneath suture and continued on peripheral angle of last whorl; beads strong, aligned transversely in oblique rows parallel to growth lines. First teleoconch whorl with three spiral cords and a fine subsutural thread, number of spirals later increased by intercalation additional cords to 5-8 on last whorl. Profile of first teleoconch whorl convex, of later whorls less so but swollen subsuturally: shell profile regularly continued from one whorl to another. Suture underlined by adapical spiral cord, therefore somewhat canaliculated. Peripheral cord covered with 4-6 thin spiral threads. Abapical surface slightly convex, bearing 6-10 spiral cords, as wide as interspaces, crossed by growth lines but not beaded. Axis with distinct umbilicus, bordered by columellar edge. Aperture as in genus. Shell colour whitish with nacre generally showing through, some specimens without pattern, others with broad blown or reddish flames starting from suture and with peripheral rim white articulated by brown streaks; others with adapical cords and peripheral rim articulated; abapical cords generally colourless, sometimes articulated. Animal like C. miliaris but with stouter, distinctly more villose cephalic tentacles, stouter epipodial tentacles with comparatively larger papillae at their base. Sides of foot tinged with yellow and with small carmine flecks, remainder of animal colourless.

This is a common species on the upper part of the seamounts. As noted for the Lusitanian banks, the populations of Clelandella from the Meteor group seamounts are also homo¬geneous between banks. There are three discrete colour morphs, one of them with an entirely white shell, one with an articulated pattern on the adapical cords, and one with broad flames, and all three are found throughout the range. Clelandella perforata differs from C. dautzenbergi (and from the mainland species) in being distinctly umbilicate at all stages. As in C. dautzenbergi, there is a clear contrast between the strongly beaded adapical cords and the nearly smooth abapical cords, but the profile of the shell is different between the two species. Clelandella perforata has a distinctly channelled suture, resulting in a trochiform outline. Contrary to other species, the peripheral cord is not very much wider than the other adapical cords of the same whorl and does not form a conspicuous rim; it is covered by several minute spirals, which are never seen in C. dautzenbergi.

North East Atlantic. Range: On the upper part of the Meteor group seamounts Meteor, Hyeres, Irving and Atlantis Banks), alive in 280-520 m depth.