Shell small, elongated; its slender appearance is stressed by its pronounced axial ribs. Dimensions 11.0 x 5.6 mm. Colour very pale brown, with lines of pale brown patches on the axial ribs: dark brown blotches on the sutural area between the axial ribs. The spiral lines are whitish. Protoconch very pale brown, relatively large, paucispiral; consists of one whorl with a maximum exposed height of 1.2 mm and a maximum diameter (measured in a plane perpendicular to shell axis) of 1.1 mm. It has some very faint growth lines on the last half whorl; the first half is too eroded to show any delicate sculpture.
Teleoconch with four slightly rounded whorls; suture impressed, sutural ramp slightly sloping down outward. Axial sculpture starts abruptly at rim of protoconch; it consists of well defined ribs, width 0.5 mm; 12, 11, 10, 10 in number of lst-4th teleoconch whorl respectively. Spiral sculpture of rather vaguely indicated spiral ribs: 5,8,11 in number on lst-3rd teleoconch whorls and 25 on last whorl. The spirals are most prominent when crossing the axial ribs, especially on the younger whorls; they are only vaguely indicated in the area between the axials, where there is also a confuse axial growth-line pat-tern. Spiral cord near periphery is the most marked, but still not very conspicuous. The upper part of the axial ribs surmounts the sutural ramp, crossing it obliquely as a wedge ending adapically in a lamella with a slightly concave profile. The shoulder of the axial ribs forms a soft coronation.
Aperture rounded trapezoidal, height 5 mm, width 2.6 mm; no parietal tooth, no inner lirae on outer lip which is slightly flared out. Columella straight, with two rather oblique brown folds near its middle, contrasting with the white columella. The white rim of the siphonal canal might be interpreted as a third columellar fold. Umbilicus completely closed by a very thin columellar callus. Dimensions: verified on shells: up to 14.5 x 7.3 mm (Grasso 1985); Nordsieck (1968: 151) repeats the height of 18 mm given by Scacchi, and D'Angelo & Gargiullo (1978: 148) mention 21 mm.

Tribia angasi versus Tribia coronata:
- Tribia angasi has the suture deeply impressed, The sutural area sloping down outward, the whorl side profil almost straight, the axial ribs distant, a second carina present, the shell colour white to pale brownish.
- Tribia coronata has the suture lesser impressed, The sutural area almost horizontal, the whorl side profil slightly convext, the axial ribs more close-set, a second carina lacking, the shell pale to brownish red.

Central Southern Mediterranean