Vertex, in the Patella the top or most prominent part, situated in general nearly in the middle. In the genus Bulla it is used for the apex.
Verrucose, warted.
Verticulated, whorled.
Umbilicated, having a depression in the centre like a navel.
Umbo, in bivalve shells, the round part which turns over the hinge.
Umbonate, bossed, having a raised knob in the centre
Undulated, waved, having a waved surface.
Ungulate, shaped like a horse’s hoof.
Unilocular, with a single chamber or compartment.
Univalve, shells consisting of one valve or piece.