Shells of Mitrolumna are of small size (maximum length ca. 10 mm), robust, fusiform, biconic. The sculpture consists prevalently of spiral cords, frequently vanishing on the periphery. Axial ribs present especially on the first teleconch whorls. Growth lines somehow lamellose visible over the entire surface. Anal sinus shallow. All species studied herein have a paucispiral protoconch, indicating a non-planktotrophic development, shiny and sculptured by sparse microgranules. Adults develop two columellar folds, of which the posterior is often stronger. Inner side of the outer lip with a series of denticles. Siphonal canal short and wide.
Coloration varying, from monochrome, to patterned with blotches, flammulae or bands.