Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 37
MARGINELLA EUCOSMIA, new species.
Plate 1, fig. 11.
Shell of medium size, marbled, excepting a broad whitish band
which extends over almost half the space between the shoulder and
the base. Whorls appressed at the summit, forming a very slightly
curved spire. Body of the last whorl very slightly convex. Outer
lip very much thickened at the edge, shouldered at the summit,
very slightly contracted in the middle, white or faintly spirally
streaked in front, decidedly so behind; columella provided with a
strong callus and four folds, the anterior two of which are much
more oblique than the rest; the first one is the weakest, and forms
the basal margin of the columella.
The type, Cat. No. 186986, U.S.N.M., comes from Port Alfred
(Coll. No. 518); it has 4| whorls and measures: Length, 12.5 mm.;
diameter, 6 mm.
Two additional lots, from Port Alfred, are in the collection of the
United States National Museum. One, Cat. No. 186987, U.S.N.M.,
four specimens (Coll. No. 519), and Cat. No. 186985, U.S.N .M., three
specimens (Coll. No. 517).
MARGINELLA, species?
Cat. No. 186986a, U.S.N.M., contains a specimen about the size
of M. eucosmia, but a little stouter, with fine brown spiral lines upon
a white background. The specimen is too worn to permit of proper
diagnosis. It comes from Port Alfred (Coll. No. 518).
MARGINELLA COSMIA, new species.
Plate 21, fig. 2.
Shell of medium size, polished, marked only by fine lines of
growth. Spire moderately elevated; whorls slightly angulated at the
periphery. Summits of succeeding turns creeping up on the preced-
ing whorl, to which they are appressed. Nuclear whorls light
yellow, succeeding turns flesh color, marked with many irregular,
wavy, axial bands of brown, which are preceded by a shadow of a
much lighter tint. Aperture wide; posterior angle very obtuse;
outer lip very much thickened, clouded with many oval spots of
ashy gray, the long axis of which is spirally disposed; columella
smoky white, provided with four almost equally strong oblique
folds; parietal wall covered by a moderately thick callus.
The type and two specimens, Cat. No. 249668, U.S.N.M., come
from Port Alfred (Coll. No. 940). The type measures: Length, 11.7
mm.; diameter, 6.8 mm. Cat. No. 186988, U.S.N.M., contains two
more from the same locality (Coll. No. 520).
80737°—Bull. 91—15 4