Epipodial lobes are with acute, conic, close warts, its edge white with irregular green dots.

Sole of the foot yellowish, narrow, the margin with a row of regular close green dots.

[4] The shell is involute, ovate, hyaline-white, swollen above, very slightly contracted immediately below the vertex, shining, with some irregular wrinkles of growth.

These pigments continue to carry out photosynthesis in the presence of sunlight, allowing O. antillarum to obtain additional nutrition.

[5] When irritated, O. antillarum will exude a thick white secretion, which contains chemicals unpleasant to many predators.