Mollusc a of porto rtco. 
391 
Cancellaria ag-assizii Dali. 
Tn'gsnostoma agassizii Dali, Blake Report, n, p. 130, pi. xxxv, fig. 4, 1889. 
Shell with live whorls, the first, rounded and smooth, the second gradually becoming cancellated, 
the subsequent whorls somewhat roundly shouldered above, having very strong, slightly flexuous ribs, 
ten on the last whorl, and about sixteen strong, revolving line, which are slightly nodulous on the 
ridges; in addition to this there are very fine, longitudinal threads all over the surface; varix on the 
outer lip but little stronger than the ribs; aperture ovate; outer lip strongly ridged within; canal short, 
open; columella scarcely callous, the threads running over it into the aperture, and having three 
plaits; umbilicus nearly closed by the reflected columella. Color reddish brown or brownish orange. 
Length, 8; diameter, 5 mm. 
A single slightly worn and bleached shell was obtained at Mayaguez, Porto Rico. The species 
extends north to Cape Hatteras, North Carolina. 
Superfamily RHACHIGLOSSA. 
Family OLIVID^E. 
Genus OLIVA Bruguieres, 1789. 
Shell oblong, subcylindrical, brilliantly polished; spire rather short; last whorl covering the 
greater part of the others; aperture elongated, slightly dilated in front; columella vertical, callous, 
more or less plicate; lip simple, thick, not reflected or toothed within; a sinus above is continued as 
a canal along the suture; notch at the base short, but well marked. No operculum. 
? Oliva litterata Lamarck. 
Oliva litterata Lamarck, Ann. du Mus., xvi, p. 315, 1809. 
Oliva literate Reeve, Conch. Icon., vi, pi. xi, fig. 18, 1850. 
This species was found at San Juan, Porto Rico, according to Gundlaeh. It is quite probable 
that the specimens he so named were the nearly allied form described in this paper as 0. caribseensis. 
Oliva reticularis Lamarck. 
Oliva reticularis Lamarck, Ann. du Mus., xvi, p. 314, 1809. 
Oliva reticularis Tryon, Man., V, p. 83, pi. xxx, figs. 90-95, 1883. 
Shell rather slender, slightly swollen at the middle; spire somewhat elevated; ridges on the 
columella numerous and strong. Ground color whitish overlaid with a faint pattern of purplish brown 
reticulations, which sometimes shows the white as triangular spots. Frequently there are two darker 
bands near center of outer whorl, and under the suture are clusters of brownish, subvertical lines. 
Length, 35 to 50; diameter, 15 to 20 mm. 
Aguadilla ; Mayaguez, Guanica, Porto Rico, many worn specimens; St. Thomas, one shell; 
Vieques, one fine specimen taken alive. A dark variety was found at Fajardo, Porto Rico. 
Oliva caribaeensis, n. s. Plate 56, fig. 9. 
Shell rather short and stout, its greatest diameter being near the shoulder; spire low, the suture 
being deeply channeled; outer lip heavy; columella having a strong white callus extending up for 
two-thirds of the length of the aperture, where it thins out; columellar plications numerous and 
distinct but not strong. The ground color is ashy yellow, becoming darker below, overlaid with a 
close faint reticulation of reddish brown. There are two faint bands of darker reticulations on the 
outside whorl and splashes and lines of this dark color under the suture. The interior is purplish; 
the columella is a little lighter colored. 
Length, 32; diameter, 15 mm. 
Mayaguez Harbor, Porto Rico. 
A rather dull and inconspicuous species, the most cylindrical of the Antillean forms and perhaps 
nearest to 0. litterata Lamarck. 
Genus OLIVELLA Swainson, 1835. 
Shell small, polished, oblong; spire acuminate ; internal shell absorbed; suture cana’iculate; 
aperture wider below ; outer lip but slightly thickened; columella plicate below, with a stronger plication 
at or near its base. Operculum generally present, oval, elongated, obtuse at its extremities, nucleus 
subapical. 
