The shell has some similarity to K. arteaga and its southern form M. roperi, but is much more lengthened and slender. The nuclear and some following whorls are broken off; 5,5 whorls remaining are strongly angular in the middle, on the last whorl at the shoulder. Axial sculpture of strong vertical ribs separated by concave intervals of about three times their width, Seven ribs on the last whorl, undulating the suture. Spiral sculpture of very finely crenulated cords and threads, with a somewhat larger one at the peripheral angle. On the penult whorl there are four major cords below the angle, three on the next earlier whorl. The aperture is rather narrowly oval, passing into a long siphonal canal equal to it in length. Anal sinus scarcely noticeable.
Length 7 mm. (as broken), diam. 2.3 mm.