Vokesinotus perrugatus (Conrad, 1846) Gulf Oyster Drill (Upper Right)

The remaining three shells are color forms of  Hesperisternia multangulus (Philippi, 1848) Ribbed Cantharus.

Near Hurricane Cut, Kice Island, just south of Marco Island, Collier County, Florida 12/2/2013. Digital images by Amy Tripp.