Shell up to 50.0 mm in length and probably larger, fusiform-elongate, upper spire whorls not preserved in specimen examined but exceeding 7 whorls, whorls convex, sutures distinct. Early spire whorls sculptured with 6 pitted spiral cords, penultimate whorl with 7 cords and body whorl with 24-25 cords; strength of cords variable, some cords slightly elevated and others almost flat. Axial sculpture consists of fine axial striae which usually intrude onto the spiral cords. Aperture narrow, smooth within, columella with 3-4 oblique folds which decrease in strength anteriorly. Color is a calcified white under a straw-colored periostracum, aperture porcellaneous white.

The species seems to be extremely rare and I was able to examine only a single specimen. The South American C. larranagai appears to be a relic of the European Miocene C. scrobiculata scrobiculata (Brocchi) and bears a close resemblance to the living W. African C. scrobiculata crosnieri Cernohorsky.

Range - From S. Brazil to Punta Medanos, Argentina. On a sand and mud substrate, from 40-175 m.