MOLLUSCA OF PORTO RICO. 
439 
Genus POLINICES Montfort, 1810. 
Shell oval elongate, subglobular or depressed, generally smooth, umbilicated or having the umbilicus 
closed by a callus. Operculum corneous, paucispiral, semilunar, having the nucleus nearly lateral, 
concave externally. 
Subgenus Payraudeautia Bucquoy, Dautzenberg & Dollfus. 
Polinices nubila Dali. Plate 58, fig. 6. 
Neverita nubila Dali, Blake Report, n, p. 294, 1889. 
Shell with four and a half convex whorls which are slightly concave below the suture, with strong 
growth lines which are somewhat plicate above, but are smoother below; it is also sculptured with 
exceedingly faint spiral lines; aperture semilunar; columella straight; umbilicus moderately open, 
surrounded by a revolving ridge at its base, which projects within, partly closing it. Color dirty milky 
white, faintly clouded with brownish. 
Height, 10; diameter, 10 mm. 
Mayaguez, Porto Rico; two slightly worn shells; also Barbados and the Gulf of Mexico. 
Subgenus Mammilla Schumacher, 1817. 
Shell rather thin, ovate, with a partially open umbilicus and a conspicuous epidermis when living. 
Polinices uberina d’Orbigny. 
Natica uberina d’Orbigny, Moll. Cubana, II, p. 31, pi. XVII, fig. 19, 1842. 
Shell white, covered with a thin, horn-colored epidermis, subovate; the last whorl large; whorls 
flattened or slightly excavated above, with very fine growth lines, and sometimes exceedingly faint 
revolving striae; aperture semilunar; outer lip thin; columella straight; umbilicus small, situated below 
the middle of the shell. 
Height, 20; diameter, 17 mm. 
Mayaguez, Porto Rico; Ensenada Honda, Culebra. 
Polinices lactea Guilding. 
Nalicina lactea Guilding, Linn. Trans., xvii, p. 29, 1833. 
Natica lactea Tryon, Man., vm, p. 49, pi. XVI, figs. 54-57, 1886. 
San Juan, Porto Rico (Gundlach). 
Extremely close to the preceding species. 
Polinices mamillaris Lamarck. 
Natica mamillaris Lamarck, An. sans Vert., Vi, part 2, p. 197, 1822. 
Natica mamillaris Tryon, Man., vm, p. 43, pi. xvm, fig. 74, 1886. 
Shell solid, conic ovate, the whorls scarcely rounded, flattened or faintly excavated above, with 
fine growth strite and still finer revolving lines; umbilicus wide, with a broad entering callus, the 
columella having an elevated callus above. The upper surface of the shell is chocolate colored and is 
covered with a thin epidermis; when worn smooth it generally shows faint longitudinal whitish 
narrow bands or lines; the base of the shell and the columella are white; within the outer lip the 
external color is seen. 
Height, 40; diameter, 31 mm. 
Aguadilla, Porto Rico, one young shell. 
Genus SIGARETUS Lamarck, 1799. 
Shell auriform, depressed, perforate or imperforate, spirally grooved ; aperture very large, oval; 
columellar border regularly arcuate; operculum corneous, small, paucispiral, prolonged below. 
Sigaretus martinianus Philippi. 
Sigaretus martinianus Philippi, Abbild. und Besehr., I, p. 144, pi. I, fig. 5, 1844. 
San Juan, Porto Rico (Gundlach). 
