394 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
This species needs to he well magnified and closely scrutinized to reveal its peculiarities. When 
worn the striation is often destroyed. The specimen figured had not acquired the crenulation of the 
outer lip. There is an allied species with short rather prominent small riblets on the shoulder of 
the whorls which is found in the West Indies, hut it can not be confounded with the present one 
if the characters he attended to. 
Section VOLVARINA Hinds. 
Marginella torticula Dali. 
Marginella torticula Dali, Bull. Mus. Comp. Zool., IX, p. 73, 1881. 
.1 farginella torticula Ball., Blako Report, ir, p. 141, pi. xix, fig. 7, 1889. 
Shell slender, glossy, grayish waxen white, with about live whorls; spire roundly pointed, 
glazed so as to nearly cover the sutures, last whorl appressed on the shoulder; axis laterally curved 
so that the spire and base turn to the right; aperture long, narrow; columella with four very oblique 
plaits; outer lip simple, not reflected, slightly thickened and produced posteriorly; canal wide. 
Length, 11.5; diameter, 3.75 mm. 
Mayaguez Harbor, one young and one badly broken adult shell. 
Marginella avena Valenciennes. 
Marginella avena Valenciennes in Kiener, Coq. Viv., Marginclla , p. 17, pi. vi, fig. 24, 1841. 
Shell elongated, with an elevated, somewhat glazed spire; aperture long and narrowed above; 
outer lip thickened and slightly varicose, somewhat incurved at middle; columella curved, armed with 
four strong plaits, lower ones a little the heaviest. Color milky white or subtranslucent, generally 
having three wide, faint hands of yellowish brown on body whorl that are usually more or less broken. 
Length, 12; diameter, 5 mm. 
Aguadilla, Porto Rico, three worn shells; Ensenada Honda, Culebra, two shells. 
Marginella albolineata d'Orbignv. 
Marginella albolineata d’Orbigny, Moll. Cubana, ii, p. 99, pi. xx, figs. 27-29, 1840. 
Shell elongated, rounded and rather inflated above, somewhat narrowed below; spire low, bluntly 
pointed, glazed; aperture long, narrow above, wider below; outer lip incurved a little at the middle, 
slightly thickened and varicose; columella curved below, with four elevated plaits, the lower a little 
stronger. Color yellowish white or amber, with from three to five more or less developed brownish 
bands, which show more distinctly on the varix. 
Length, 9; diameter, 4 mm. 
Ensenada Honda, Culebra, one shell. 
Marginella lactea Kiener. 
Marginella lactca Kiener, Coq. Viv., Marginella, p. 42, pi. xm, fig. 3, 1841. 
.Shell rather small, with a moderately developed glazed spire; outer lip thickened a little, scarcely 
varicose, incurved in the middle; columella nearly straight, with four strong, nearly even plaits. Color 
milky white throughout. 
Length, 7; diameter, 3 mm. 
Mayaguez, Porto Rico, one shell; Ensenada Honda, Culebra, six specimens. Close to the last, but 
having a rather higher spire and differing in color pattern. 
Marginella fusca Sowerby. 
Marginella fusca Sowerby, P. Z. S., 1846, p. 95. 
Marginella fusca Sowerby, Conch. Icon., xv, pi. xvn, fig. 82, 1865. 
Shell elongated, with rather elevated, glazed, pointed spire; outer lip with a delicate, narrow 
varix ascending the spire, decidedly incurved at the middle; columella nearly straight, with four 
oblique plaits, the lower the strongest; parietal callus widened below. Color smoky brownish, with 
two or more wide, faint, darker bands. 
Length, 8; diameter, 3.5 mm. 
Arroyo, Porto Rico, one specimen. 
