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$5/8$ to $3/4$ inch in length, equally wide. Moderately thin with a sharp lip. The round, narrow umbilicus is partially covered by the top of the columella. Color pearly-white. Sculpture of whorls in spire with 3 evenly spaced spiral rows of prickly beads. Suture wavy. Base of shell with 4 to 5 spiral threads which bear smaller, often obscure, beads. Nuclear whorls with axial lamellae. S. regalis Verrill and Smith is the same Species. Common from 50 to 100 fathoms.

$1/4$ inch in length, similar to Margarites costalis, but with whorls made more angular by one large, feebly beaded, spiral cord above the periphery. Base smoothish except for microscopic, spiral scratches. Umbilicus narrower and bordered by an angular rim. Color grayish to pinkish tan, often worn to reveal a pearly-golden color. Aperture pearly-white. Some Specimens may have weak axial riblets below the strongest spiral cord on the periphery of the whorl. Commonly dredged from 3 to 400 fathoms, especially on the Grand Banks.

$3/8$ inch in length, equally wide, thick, pure white. Whorls convex. Aperture circular, internally pearly. Suture channeled. Whorls with 6 spiral cords, bottom 3 smooth, the upper ones axially beaded. Nuclear whorls glassy, with microscopic axial ribs. Umbilicus round, narrow, deep, lined with spiral rows of coarse beads. Very commonly dredged from 18 to 100 fathoms.

$1/8$ inch in length, similar to S. lacunella, but with a much deeper channel at the suture below which are numerous, small axial, short lamellar-like ribs.