Polystira florencae
Polystira florencae is a species of sea snail, a marine gastropod mollusk in the family Turridae, the turrids. Description The length of the shell varies between 17 mm and 30 mm. (Original description) The rather large shell has a fusiform shape. It is, pale brown, excepting the large median keel between summit and suture and a broad area that extends over a little more than half of the posterior part of the columella, which are white. The tops of the other spiral keels are also a trifle paler than the spaces between them. The first 1.5 whorls of the protoconch are large, well rounded, and smooth. These are followed by about one half of a turn that is crossed by about 10 slightly retractively curved, axial ribs, which are about one fourth as wide as the spaces that separate them. The postnuclear whorls are marked by very strong spiral keels, of which the most conspicuous one is the second one below the summit, which bears the deeply narrow posterior sinus. The first keel occupies the space almost midway between the summit and this keel. Anterior to the strong keel, there are on each whorl two additional keels, one, the stronger,