Nassarina xeno: The shell is obesely fusiform, solid. Color various, the type faintly yellowish with white ribs, with an interrupted brown peripheral line on the last whorl, appearing also on the penult; nest earlier two whorls have a few small black spots scattered along the middle. Whorls moderately convex, the first 2,5 smooth (worn), following whorls with axial sculpture of rounded ribs scarcely equal to their intervals, about 10 on the last, 11 on the penult whorl, and fiiie, thread-like growth-lines, which are obsolete or subdued on the spirals. Spiral sculpture of rather strong spiral cords, six on the penult whorl, a trifle stronger on the ribs than in the intervals; on the last whorl and anterior canal there are 18 cords. The aperture is indistinctly sigmoid, having a broad, rounded, anal sinus, the outer lip slightly retracted there, preceded by a low swelling, thin, with a series of five teeth within, the upper strongest. Siphonal canal not differentiated, a little recurved, deep. Columellar lip white calloused, with about five weak denticles and a slightly raised outer edge. Siphonal fasciole weakly convex. Length 6 mm., diam. 2,8 mm.
Each small black spot of the spire colors a single tubercle of the third or fourth spirals from the upper suture, on alternate ribs, or more widely spaced. The brown dashes form an interrupted line on the last whorl, or sometimes two lines on adjacent spirals.
It differs from N. poecila by the evenly convex upper and peripheral outlines of the last whorl.

Nassarina xeno: Type location: San Juan del Sur, Nicaragua .