Shell small, fusiform, white, strongly keeled above the middle of the whorls, very finely spirally sculptured. Spire approximately the same height as the aperture plus canal. Base rather strongly contracted, canal long, widely open. Whorls 5,5, including a typical protoconch of 1,5 whorls. Axials rather narrow, extending iroin suture to suture on the body whorls, but becoming obsolete across the base on the body whorl, 15 in number on the penultimate, 16 on the body whorl. Spiral forming the keel moderately strong and nodulous, all other spiral sculpture very line. A weak subsutural fold with 8 very fine raised spirals on the shoulder on the spire whorls, 10 on the body whorl. Below the keel on the spire whorls there are some 10 fine spirals which are rather more variable in strength of development. On the body whorl some 40 fine spirals across the body base, and fasciole, every fourth or fifth spiral noticeably stronger. The fine spirals are crossed by fine regular growth lines which break the spirals into minute squares, which in well-preserved specimens are raised into microscopic processes. Aperture long and narrow, outer lip thin. Sinus broad and shallow, occupying the shoulder.
Height, 8,2 mm.; diameter. 3,7 mm.

The numerous fine spirals differentiate this form from any other described species of Antiguraleus.