Bulletin - United States National Museum - Smithsonian Institution

34 BULLETIN 91, UNITED STATES NATIONAL MUSEUM.
threadlike, retractive, axial riblets and spiral lirations. The spiral
lirations are of varying strength. The strongest is at the angle of
the shoulder and its junction with the axial riblets forms a series of
sharp tubercles. Two other spirals, one at the periphery and another
a little posterior to the middle between the angulated shoulder and
the periphery, are of equal strength, and form weak tubercles at
their juncture with the riblets. The flat summits of the whorls are
marked by nine fine lirations, while the space between the angle and
the strong supramedian liration is marked by one moderately strong
thread followed by a weak one, which is succeeded by a stronger one
and three slender threads. The space between the tuberculated
median and peripheral cords is marked by three moderately strong
lirations, which in turn are separated by finer raised threads. Pe-
riphery rendered slightly angulated by the cord. Base of the last
whorl with a deep, moderately broad umbilicus, the space between
the umbilical margin and the periphery well rounded, marked by six
equal and equally spaced lirations which equal the median one of
the spire in strength. These lirations, like those of the spire, are
separated by finer ones, two of which usually occur in the space
between them. Umbilicus marked by strong fines of growth and
slender, crowded, equally developed, raised spiral threads. Aperture
angulated pear-shaped; outer lip angular; columella strongly re-
flected, almost straight, provided with two strong oblique folds.
The type, Cat. No. 17074, U.S.N.M., has five post-nuclear whorls
and measures: Length, 18 mm.; diameter, 13.4 mm.; greatest length
of aperture, 11 mm.; greatest diameter of aperture, 8 mm.; width of
shoulder immediately behind the aperture, 2 mm. The type comes
from the Cape of Good Hope.
Family OLIVIDAE.
Genus EBURNA Lamarck.
EBURNA PAPILLARIS Sowerby.
Cat. No. 227773, U.S.N.M., one specimen from Port Alfred (Coll.
No. 868).
Genus ANCILLA Lamarck.
ANCILLA OBTUSA Swainson.
Cat. No. 227771, U.S.N.M., one specimen from Port Alfred (Coll.
No. 866).
ANCILLA DECIPIENS Sowerby.
Cat. No. 163022, U.S.N.M., contains one specimen from Kowie, ob-
tained from Sowerby and Fulton.
ANCILLA REEVEI Smith.
Cat. No. 186702, U.S.N.M., six specimens from Port Alfred (Coll.
No. 62).