Rivero’s shoulderband

Shell trochiform, fragile, sharply keeled, finely
sculptured, and imperforate. Color a uniform, medium golden
to olivaceous brown with a single dark brown band just below
the periphery. In some specimens there is an indication of an
additional brown band just above the keel.Whorls 5^, nearlystraight sided and sharply keeled; slightly concave above the
keel and slightly convex below. Spire extended and produced
at an angle of about 80°. Aperture ovate, depressed slightly
downward, and produced at an angle of about 42" from the
base. Palatal lip thin, narrow, white and slightly reflected.
Parietal wall thinly glazed. Columella short, not noticeably
thickened and curving into the base of the outer lip. Suture
well marked but not impressed. Axial sculpture consisting of
fine growth lines which become coarser on the later whorls.
Spiral sculpture consisting of numerous fine and somewhat
irregular threads. Nuclear whorls H and smooth. Mantle a
rather uniform light chocolate-brown with a dark brown subperipheral
stripe. Foot light brown, darkening posteriorly.