Cellana radiata enneagona: Shell moderately large, up to 53 mm. (2,125 inches) in length but usually smaller, narrowly ovate to irregularly angular, with the apex between the center and the anterior third. Sculpture consisting of 9 conspicuous, rounded, radial folds. The entire surface, folds and interspaces alike, is crowded with narrow, crisp radial cords that are rendered slightly scabrous by concentric growth lines. Margin of shell irregular, being strongly projecting at the terminal points of the radial folds, and concave in the interspaces. Colour pattern of interior variable, consisting of radial dark purplish brown streaks upon a pale creamy ground, or the streaks may either ramify towards the margin or break up into tessellated patterns. Usually there are 9 narrow radial areas free from colour pattern, and these correspond to the external folds. Spatula long and narrow, dark-chestnut, sometimes white-callused to a varying degree.Length: 25-50 mm; Width: 20-43 mm; Height: 6-13,5 mm

Cellana radiata enneagona: The elongated, narrowly ovate shape, nine prominent radial folds, and irregularly indented margin, characterise this form or subspecies.

Cellana radiata enneagona: Madagascar, Andaman Islands, Indonesia, Philippines and Bonin Islands, Japan.