Compsodrillia nana

The first one-half of the protoconch whorl is well rounded, smooth, the last half is marked by a few rather distantly spaced, slightly protractively slanting axial riblets.

The postnuclear are whorls well rounded, the first marked by three slender spiral cords, of which the anterior two increase more rapidly in size than the first one, which remains rather feeble.

The summit of the whorls is marked by a smooth spiral cord representing the portion appressed to the preceding turn.

The axial sculpture consists of strong, broad, rounded, protractively slanting ribs, which are about twice as wide as the spaces that separate them.

The columella is rather short and stumpy, marked by nine subequal, closely spaced, feebly nodulose spiral cords.