Cerion arangoi Pilsbry and Vanatta, 1896
"Shell similar to the type in form, but smaller. Latter two whorls only of equal diameter, those above forming a rather long cone. Whorls 8½ to 9. Surface closely and regularly ribbed throughout (except the smooth nepionic whorls), the ribs mainly white, interstices purplish-brown, mottled with white. Sutures without noticeably exserted margination. Aperture deep, rich purple within.
Alt. 23½, diam. lO⅔; alt. of aperture 9 mm.
Alt. 18⅔, diam. 9; alt. of aperture 8 mm.
Alt. 24, diam. 10⅔; alt. of aperture 9⅔ mm.
Cienfuegos, Cuba (R. Arango).
Strikingly different from iostomum at first sight, but we believe it to be closely allied and probably a subspecies thereof." (Pilsbry & Vanatta, 1896:330)