Bulletin - United States National Museum - Smithsonian Institution

72 BULLETIN 91, UNITED STATES NATIONAL MUSEUM.
Two specimens of this species, Cat. No. 186841&, U.S.N.M., come
from Port Alfred (Coll. No. 208) . One of these is a young individual,
which has 10 postnuclear whorls, and measures: Length, 6 mm.;
diameter, 2 mm. The other, the type, has lost the nuclear whorls,
and early postnuclear turns; the eight remaining measure: Length, 9
mm.; diameter, 3 mm. The present species is closely allied to the
preceding, but is in every way much larger; it also differs in colora-
tion, and is more widely umbilicated.
PYRAMIDELLA (ORLNELLA) IMA, new species.
Plate 15, fig. 3.
Shell elongate-conic, pale flesh colored, with a broad, pale yellow
band immediately below the summit which extends over the posterior
third of the whorls between the sutures, and a very narrow, light brown
band a little anterior to the periphery. Nuclear whorls decollated.
Postnuclear whorls feebly shouldered at the summit, flattened in the
middle, marked by fine, slightly retractive lines of growth, and exceedingly
fine, closely spaced, spiral striations. Sutures moderately
constricted. Periphery of the last whorl strongly rounded. Base
short, very strongly rounded, narrowly umbilicated, marked like the
spire, the lines of growth being a little stronger than on the spire.
Aperture broadly ovate; posterior angle obtuse; outer lip thin;
columella slender, oblique, slightly revolute, provided with an ob-
lique fold near its insertion; parietal wall glazed with a thin callus.
The type, Cat.' No. 250408, U.S.N.M., comes from Port Alfred
(Coll. No. 1281). It has lost the nucleus and the early postnuclear
whorls; the eight remaining measure: Length, 7.5 mm.; diameter,
2.5 mm.
PYRAMIDELLA (ACTAEOPYRAMIS) NORNA, new species.
Plate 15, fig. 4.
Shell moderately large, elongate-conic, white. Nuclear whorls
slightly, obliquely immersed in the first of the succeeding turns,
above which the tilted edge of the last volution only projects. Post-
nuclear whorls strongly shouldered at the summit, marked by equal
and equally spaced, incised, spiral grooves, which permit the spaces
between them, which are about three times as wide as the grooves, to
appear as well-raised spiral cords. Of these grooves, six appear upon
the first and second, and seven upon the succeeding turns between
the sutures. In addition to the spiral grooves, the whorls are marked
by very slender, quite regular and regularly spaced, somewhat re-
tractive, axial threads, which are best shown in the grooves which they
divide into a series of punctations, about 80 of which occur upon the
last turn. The spiral cords between the spiral grooves are slightly