We have used this name for a group of species which agree rather well with Gymnobela, except for having a more polished, greyish semitransparent shell, almost of vitreous structure, instead of a dull, chalky, brownish or porcellaneous structure. The upper post larval whorls are strongly shouldered. The sculpture consists of axial ribs and/or spiral lines or may be absent at least on the last whorls. All these species attain a considerable size, 40—60 mm. The species placed here seems to form a natural group.