MOLLUSCA OF PORTO RICO. 
395 
Marginella subtriplicata d’Orbigny. 
MargineBM, subtriplicata d’Orbigny, Moll. Cubana, n, p. 99, pi. xx, figs. 30-32, 1845. 
Shell elongated, subcvlindrical; spire glazed, of moderate height; outer lip scarcely thickened, 
much advanced at the middle, where it is slightly inflected; aperture narrow, a very little wider below; 
columella straight, with three moderate, equal plaits, and sometimes a faint indication of a fourth one 
above; parietal wall with a narrow callus. Color yellowish white. 
Length, 10; diameter, 4 mm. 
Ensenada Honda, Culebra, one adult and two young specimens. 
Marginella pallida Donovan. 
Bulla pallida Donovan, Brit. Shells, pi. lxvi, fig. 527, 1800. 
Shell cylindrical, thin but strong, with a low, bluntly pointed spire; outer lips scarcely thickened 
but rounded on its edge, very slightly incurved in the middle; columella rather sharply curved, with 
four moderate, very oblique plaits, the two lower a little nearer together and elevated on a twisted 
ridge that forms the termination of the columella. Color whitish or straw color. 
Length, 15; diameter, 7 mm. 
Mayaguez, Porto Rico, one shell; Caballo Blanco Reef, Vieques, one young specimen. 
Subgenus Persicula Schumacher, 1817. 
Shell bulliform, with spire depressed or sunken, generally marked with broken bands of color; 
outer lip denticulated; inner lip callous above, having four plaits below and smaller ones above them. 
Marginella catenata Montagu. 
Marginella calenata Montagu, Test. Brit., p. 236, pi. vr, fig. 2, 1803. 
Shell obtusely ovate; spire concealed, covered by the last whorl, which incloses it with a plicate 
edge, and this is sometimes overlaid with callus; aperture narrow, curved, slightly wider below; outer 
lip having fine plications within; columella heavily callous, with four strong plaits below and a few 
fainter ones above; base slightly notched. Colorwhitish, with chain-like revolving bands of milk-white 
and brownish markings. 
Length, 3.5; diameter, 2.5 mm. 
Mayaguez, Porto Rico, two badly worn shells. The specimens are in such condition that they 
can only be referred to this species with doubt. 
Marginella catenata var. pulcherrima Gaskoin. 
Marginella pulcherrima Gaskoin, P. Z. S., 1849, p. 21. 
Marginella pulcherrima Try on, Man., v, p. 39, pi. xi, fig. 30, 1883. 
Has the form of M. catenata, but the ground color is pale Drown, with revolving rows of white 
spots. The callous nucleus is painted with a brown, many-pointed star, and there are two wide, 
whitish bands on the body whorl bearing vertical brown lines. At each edge of these light bands is a 
row of dark, minute spots, and there is a little dark color on the base. 
Mayaguez, Porto Rico, one beautiful shell. 
Marginella interrupte-lineata Muhlfeld. 
Marginella interrupte-lineata Muhlfeld, Berl. Mag. Naturf. Fr., 1818, p. 6, figured. 
Mayaguez, Porto Rico (Gundlach). 
Subgenus Volutella Swainson. 
Spire somewhat elevated, but wholly concealed by the last whorl; outer lip thickened and 
varicose; columella with three or four plaits. 
Marginella ovuliformis d’Orbigny. 
Marginella ovuliformis d’Orbigny, Moll. Cubana, ii, p. 101, pi. XX, figs. 33-35, 1845. 
Shell minute, glassy white, swollen above; outer lip heavy, developed into a well-marked varix 
which extends on to the spire and is feebly denticulated within; aperture narrow and of about even 
width throughout; columella with three plications. 
Length, 1.75; diameter, 1 mm. 
Mayaguez, three shells. 
