438 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Family XENOPHORID/E. 
Genus XENOPHORA Fischer de Waldheim, 1807. 
Shell trochiform, concave or flat below; whorls flat, bearing a row of extraneous objects, which are 
attached near the suture; sometimes these are placed all over the upper part of the shell; last whorl 
compressed and carinated at the periphery; aperture large, oblique; operculum suboval or trapezoidal. 
Xenophora caribsea Petit. 
Xennplinrn caribiea Petit, Journ. de Conchyl., 1856, p. 248, pi. x, figs. 1, 2. 
Thin, pale yellowish brown or whitish, white beneath; the carina of the last whorl extended 
much beyond the base; the surface sculptured with fine, oblique, corrugated wrinkles, and having an 
interrupted row of fragments agglutinated along the suture; base with faint, revolving lines, crossed 
by very fine growth lines; umbilicus moderate. 
Diameter, 60; height, 30 mm. 
One young specimen was obtained at Aguadilla, Porto Rico. 
Family NATIClDtE. 
Genus NATICA Scopoli, 1777. 
Shell oval or globular, porcellanous, shining, solid, generally smooth, umbilicated, the umbilicus 
spirally ribbed; aperture semilunar or oval, entire; columellar edge subvertical; operculum semilunar, 
calcareous, paucispiral, its nucleus excentric, the outer surface often spirally ribbed. 
Natica canrena (Linnseus) Auctorum. 
Nerita canrena Linnaeus, Syst. Nat., ed. x, p. 776, 1758 (ex parte). 
Nation canrena Reeve, Conch. Icon., ix, pi. iv, tig. 14, 1855. 
Shell with five and a half rounded whorls, the suture well impressed, the surface below it slightly 
flattened and wrinkled, last whorl descending; aperture large, semioval; umbilicus narrow, spirally 
entering; upper callus of the columella short, separated from the lower callus by a square notch. The 
ground color varies from whitish to tawny; the last whorl has three rather broad, darker bands about 
its middle, and over entire shell, except the base, there are wavy or zigzag, longitudinal strigations, 
which show through the dark bands to some extent; base white. Sometimes it has very faint revolving 
sculpture. 
Height, 45; diameter, 40 mm. 
Mayaguez, Porto Rico; one large, broken shell and two young ones. 
The original N. canrena of Linnseus comprised several species. 
Natica sagraiana d’Orbigny. 
Natica sagraiana d’Orbigny, Moll. Cubana, n, p. 34, pi. xvm, figs. 20, 22, 1842. 
San Juan; Quebradillas, Porto Rico (Gundlach). 
Section STIGMAULAX Morch, 1852. 
Natica sulcata Born. 
Nerita sulcata Born, Mus. Ctes. Vind., p. 400, pi. xvn, figs. 5, 6, 1780. 
Shell with six rounded whorls which are not flattened on the shoulder, shining, sculptured 
throughout with strong, longitudinal ribs; these are crossed by rather fine, impressed striae, which 
give the surface a somewhat cancellated appearance; umbilicus rather strong and opening near the 
upper end of the columella, the revolving ridge within it wide and rounded. Color pale fulvous, 
irregularly banded with darker color, often marked with wavy, longitudinal markings; sometimes the 
shell is nearly a uniform livid brown; base white. 
Height, 20; diameter, 18 mm. 
Porto Rico, no special locality, two shells. 
