Opisthostoma deccanense Beddome, 1875  

Beddome (1875)'s description

"Shell irregularly rhomboidal, pale pick, with an oblique rather distant costulation, prominent on the lowest whorl, but less so on the others; whorls 5, excentric, the two apical ones very small and depressed and only visible as a single small speck from a side view, the third much larger, convex, the fourth, or penultimate, convex, very large, and much dilated, lowest whorl constricted as usual and in front of the constriction deflected inwards, but not concealing the umbilicus; aperture reversed, circular, quite vertical and parallel with the penultimate whorl; peristome touching the centre of the penultimate whorl, double, both lips slightly dilated, with a broad channel between them; total length 1/18 inch, breadth 1/14 inch."