MOLLUSC A OK PORTO RICO. 
393 
Mayaguez, Porto Rico, many slightly worn shells. 
Lamarck’s description is too brief to properly characterize this species, and the figure he refers to 
in the Conchylien Cabinet is a dorsal view and rather poor. 
Olivella nivea Gmelin 
Voluta nivea Gmelin, Syst. Nat., p. 3442, 1792. 
Olivella nivea Try on, Man.,v, p. 67, pi. xv, figs. 74-88, 1883. 
San Juan, Porto Rico (Gundlach); Florida; West Indies. 
Olivella verreauxi Duclos. 
Oliva verreauxi Duclos, Rev. Crit., p. 97, pi. in, figs. 86 a, b, 1857. 
According to Gundlach this form is found at Aguadilla and Quebradillas, Porto Rico. 
Family MARGINELLIILE. 
Genus MARGINELLA Lamarck, 1801. 
Shell imperforate, ovoid conical or subcylindrical, porcellanous, smooth and shining, sometimes 
having longitudinal ridges; spire rather short or often sunken; aperture long; outer lip thickened and 
sometimes toothed; columella with three or four plaits. 
Marginella apicina Menke. 
Marginella apicina Menke, Syn. Meth. Moll., p. 87, 1828. 
Marginella conoiclalis Reeve, Conch. Icon., xv, pi. xvni, fig, 87. 
Shell solid, conoidal; spire low, plane, the suture merely marked by a line; outer lip having a 
heavy, distinctly marked varix, smooth within; base rounded; columella with four- strong, nearly 
equal plaits, the two lower a very little nearer together than the others; parietal wall callous above. 
Color white, amber, or sometimes pale ashy reddish, the nucleus generally reddish and always 
translucent; there are usually three or four brown blotches just at the back of the varix, one of these 
on the spire and one at the base of the shell, but they are sometimes partly or wholly wanting. 
Length, 12; diameter, 7.5 mm. 
Three fine, small specimens were taken on the beach at Mayaguez. 
A beautiful, common, and widely distributed species, quite variable in size and coloring. It is 
often faintly banded. 
Marginella hematita Kiener. 
Marginella hematita Kiener, Coq. Vivantes, genus Marginella, p. 11, pi. vn, fig. 31, 1841. 
Shell conoidal, solid, with a rather elevated spire; whorls five, slightly rounded; outer lip 
heavily varicose, advanced in the middle, with about fifteen teeth inside; base rounded; columella 
with four very prominent strong, even plaits, which are evenly spaced; columellar area not calloused; 
surface smooth, sometimes slightly pustulous or pitted. Color purplish or deep red. 
Length, 9; diameter, 5.5 mm. 
Aguadilla, Porto Rico, one worn shell. 
This is a beautiful species when fresh, and is often colored very brilliant deep red. 
Marginella striata Sowerby. 
Marginella striata Sowerby, Thes. Conch., i, pi. lxxv, figs. 81, 82, 1846. 
Shell volutiform; spire moderately produced, the whorls slightly rounded; spire and body whorl 
covered with straight, longitudinal ribs; outer lip thickened into a distinct varix, strongly crenated 
within; columella with four strong, equal plaits. Color whitish. 
Length, 3; diameter, 1.5 mm. 
Mayaguez Harbor, Porto Rico, one worn, broken shell. 
Marginella evadne, n. sp. Plate 57, fig. 10. 
Shell minute, white, solid, polished; form and proportions essentially as figured; the whorls 
sculptured by fine, even, axial, close-set strife, obsolete anteriorly; the aperture narrow; the pillar lip 
with six or seven close-set plaits, enlarging anteriorly, the most anterior being considerably the largest; 
outer lip not marginate; in fully adult specimens minutely crenulate within. 
Length, 2.5; maximum diameter, 1.5 mm. 
Mayaguez Harbor, Porto Rico. 
