Turbonilla compsa

Turbonilla compsa is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.

Description
The shell grows to a length of 3.4 mm. It is  small, opaque white, with  considerable  lustre. Its upper portion is much more abruptly tapered  than the lower. The eight whorls of the teleoconch are flattened. The only curvature is just  above the  suture which is so deep and straight  that each whorl extends out  abruptly beyond the preceding  one. The transverse ribs are irregularly developed due to an injury. There are about 30 narrow and, perpendicular ribs. They are straight on the upper whorls, becoming slightly curved above. On the  lower whorls they are separated by wider, moderately  deep spaces, which end at  the periphery  of  the  well-rounded body whorl in  clean-cut,  rounded ends. The base of the shell is elongate, and well-rounded. The inner lip is straight and thickened.