MOLLUSCA OF PORTO RICO. 
445 
Family LI0TIID4E. 
Genus LIOTIA Gray, 1842. 
Shell turbiniform or discoidal, longitudinally ribbed or elathrate; aperture slightly nacreous, 
with continuous peristome, which is thickened and callous. Operculum multispiral, corneous, 
hispid, with a calcareous layer of pearly particles spirally disposed. 
Liotia gemma Tuomey & Holmes. 
Trochus gemma T. & H., Pleioc. Fos. S. Car., p. 118, pi. XXVI, fig. 4, 1856. 
Architectonica tricarinata Stearns, I’roc. Bost. Soc. Nat. Hist, for 1872, p. 23. 
Shell low conical, with four whorls, which are sloping above and have on the wide periphery 
three revolving carinas; these Carinas are slightly beaded; there is a revolving row of beads just 
below the deep suture; there are on the body whorl additional fine beaded ridges; aperture round, 
the lip but slightly thickened, with a sulcus separating it from the previous whorl; umbilicus 
moderate, with a beaded carina. Surface whitish pink or purplish, maculated with darker color. 
There is a row of reddish spots on the lower peripheral carina. 
Diameter, 3; height, 2 mm. 
Mayaguez, Porto Rico, one slightly broken and worn shell. 
Family VITRI NELLI D4E. 
Genus LEPTOGYRA Bush, 1897. 
Shell minute, dull, dirty white or pale brown, covered with a thin straw-colored epidermis; 
whorls few, convex; spire elevated, with twisted nuclear whorl; umbilicus large; aperture very 
oblique; lip simple, continuous. 
Leptogyra inconspicua Bush. 
Leptogyra inconspicua Bush,? Trans. Conn. Acad. Sei., x, p. 137, 1897. 
Shell with two and a half whorls, with low obtuse apex; surface nearly smooth, with microscopic 
growth lines and ill-defined wrinkles extending from the suture some distance down the shell. 
Diameter, 1.3; height, 1.8 mm. 
Mayaguez, Porto Rico, one young shell, of which the identification is doubtful. 
Family NER1TID4L 
Genus NERITA (Linnaeus, 1758) Lamarck, 1799. 
Shell imperforate, globular or oval, solid, smooth or with spiral sculpture; spire short; aperture 
semilunar, entire; lip thick, generally toothed within; columellar area large, flattened, often sculptured, 
its border dentate. Operculum calcareous, the external face granulous or sculptured, paucispiral; 
nucleus excentric; internal face callous; apical and claviform apophyses well developed. 
Nerita peloronta Linnaeus. 
Nerita peloronta Linnaeus, Syst. Nat., x, p. 778, 1758. 
Nerita peloronta Reeve, Conch. Icon., ix, pl.n, figs. 8, 86, 1855. 
Shell with a sharp-pointed spire and somewhat rounded whorls, the last concave just below the 
shallow suture; sculptured with revolving ridges which are strong and sharp on the earlier whorls 
but which become rounded and rather faint toward the aperture; within the lip there are two teeth 
above, a larger and a smaller, and one at the base, and between these there are vestigial teeth; there 
are two strong teeth on the columella, the upper the larger; the columellar face is slightly ridged, 
and at its upper termination there is a small canal. Color whitish, yellowish, or purplish, variously 
mottled and zigzagged with red or black. The columellar area is stained red as if with blood, hence 
the popular name “ Bleeding tooth shell.” 
Height, 40; diameter, 45 mm. 
San Juan; Hucares; Aguadilla, Porto Rico; Culebra Island. 
