Opisthostoma uranoscopia van Benthem Jutting, 1932  

Benthem-Jutting (1932) original descriptions on Opisthostoma (Opisthostoma) uranoscopia – “Shell dextral, obliquely cylindrical, with the last whorl ascending towards the aperture, the mouth consequently being turned upwards. Uniformly white or pale pink, opaque. Apical whorl smooth, the others ornamented with oblique costulations which become more projecting and more distant as growth proceeds. Whorls 4, convex, the apical and second ones very small and depressed, hardly projecting from aside view of the shell; third and fourth forming a short oblique cylinder. Last whorl slightly constricted at the commencement of the deviation in coiling. Suture deep. Aperture trumpetshaped, subangularly circular, turned upwards, lying in a nearly horizontal plane. Peristoma continuous, double, the final rim broad and a little dilated, especially towards the side of the shell; here it covers the penultimate whorl, reaching to the suture which separates the second from the third whorl. Umbilicus oval, not concealed by the last whorl. Operculum horny, tranclucent, indistinctly paucispiral, with a nearly central nucleus. Animal minute and generally extruding very little from the shell. The latter is borne in the reversed position with the top downward. Colour of the whole animal white, translucent. Tentacles two, hyaline, slender, bearing at their outside base the sessile eyes, appearing as black sprecks. When the snail is crawling narrow foot does not project beyond the shell behind.”