The upper ones are spirally sulcate or carinate. The aperture is subquadrate and finely sulcate inside. Pollen sulcate but often inaperturate (lacking apertures). The shell is transversely spirally sulcate, the interstices longitudinally striated. The small aperture is contracted, sulcate and iridescent within. The aperture is subcircular, almost smooth (a trifle sulcate) within, and vividly iridescent. The aperture is subovate and delicately sulcate within . It is nacreous, iridescent and sulcate within. The aperture is irregularly subquadrate and sulcate within. It is lined with a closely sulcate silvery and iridescent nacre. The aperture is transverse, and scarcely sulcate within. Shell evolute, venter flat to sulcate. It may be even or sulcate (grooved). The lip is called "sulcate", when it is grooved within. The narrow body whorl narrow has a rounded shoulder, and is distantly sulcate below.