Shell from fusiform to claviform, solid, rather glossy, spire slightly shorter than last whorl. The first of the 10-11 whorls are slightly sloping down but readily become broader downwards giving the shell a more or less globose outline. First whorls are rather curved, later whorls more evenly and poorly curved. Depending on the general appearance the last whorl is prominently present, the last whorls sometimes only slightly thickened or steeply roof-shaped from the suture forming an edge in the transition to the whorl, its projection only slightly visible. Whorls are separated by a clear suture always followed by a thickened ridge or cord in the first whorls. This ridge or cord disappears afterwards or turns into a parietal callus, depending on the species involved. On the body whorl there is an anal sinus, rounded dorsally and broadened ventrally. The siphonal canal is clearly delineated and is slightly curved at its base. The mouth is oval, clearly separated from the last whorl, and constricted at the top where the parietal thickening ends. The interior of the mouth is whitish, with the darker colour of the outside shining through. The peristome is sharp. The first 1.5 whorls are smooth, glossy and translucent. Afterwards the spiral structure appears which is surely clearly visible in T. lineata, while in other species it is attenuated and only visible under a magnifying glass, yet sometimes prominently present. Curved folds cross all over the first whorls becoming obsolete later on and ending in short, oblique plicae above the suture which - depending on the species -only occur between the second and the seventh whorl and completely disappear later on. The siphonal canal is always provided with spiral grooves which are more or less developed. The operculum is oval, with a central nucleusl.


' This apparently monotypic genus differs from Perrona in its short, concavely outlined spire, massive peripherical fold, lack of a basal angulation, very heavy parietal callus pad, and deep slit-like anal sinus. Protoconch small, papillate, of 1.5 smooth whorls, followed by a whorl of sigmoid brephic axials. Colouration most distinctive, consisting of numerous narrow dark-brown axial lines on a cream coloured ground. The lines are chevroned in the region of the sinus fasciole, which is in the form of a very shallow groove, situated well below the massive peripheral fold. The anal fasciole does not show on the spire whorls, being immersed by each succeeding whorl. Parietal callus pad white, very massive. Radula with a small narrow-based unicuspid central and a pair of large long simple pointed marginals, with one of the basal limbs detached and overlaid. Known only by the type species, which is Recent from West Africa.'