Shell oblong-biconic (b/l 0.42-0.46, a/1 0.42-0.52), spire turreted, somewhat cyrtoconoid; early whorls strongly convex, developing on later whorls into a prominent, rounded shoulder at about 0.3 whorl below suture, subsutural region strongly sloping; end of siphonal canal obliquely rounded-truncate, not indented; teleoconch whorls to about 3.6. Aperture narrowly elliptical, inner lip with a thin callus, thickening slightly in parietal region, length of lip bearing about 12 fine, rather weak and irregular transverse pleats, those in parietal region sharpest, inner edge of columella with a few denticles; outer lip smooth or with up to 14 weak pleats, usually strongest below anal sinus; edge of lip in side view gently convex, with wide, very shallow stromboid notch, anal sinus rather shallow, widely, asymmetrically U-shaped. Varix strong, in t/s rounded, trailing edge steep. Sculpture of narrow axial ribs, crossed by very fine spiral threads. Axial ribs narrow, opisthocline, shallowly sinuous on last whorl, slightly arcuate on spire whorls, extending from suture to base, in t/s rather low, somewhat compressed, angularly rounded, more or less equal to intervals, 11-12 per whorl. Spiral sculpture throughout of fine threads, 6-8 on penultimate whorl, their intervals densely filled with even finer spiral threads; collabral threads absent. Translucent white, dorsum of last whorl with a faint yellowish tinge or a few short pale yellowish-brown bars.
Protoconch bluntly domed (helicoid), of about 1.5 whorls, protoconch 1 tilted, smooth, except for a few weak terminal riblets, breadth 0.31 mm.

This species shows some similarity to Eucithara eumerista (Melvill & Standen, 1895) and E. abakcheutes (Kilburn, 1992), but E. perhumcrata differs from these in its prominent shoulder, translucent shell and finer apertural teeth. The protoconch in E. perhumerata is unusual among the species referred to Eucithara. In overall appearance this species seems somewhat intermediate between Eucithara and Agathotoma Cossmann, 1899, a genus to which many of the Indo-Pacific species of Eucithara auct. appear to be referable.

Yemen. Red Sea.