Bulletin - United States National Museum - Smithsonian Institution

20 BULLETIN 91, UNITED STATES NATIONAL MUSEUM.
the parietal wall, in the posterior portion of which it becomes decidedly
thickened. Ground color cream yellow; intercostal spaces and
slight extensions of their areas posteriorly across the sulcus and the
summit of the keel chestnut brown. The same coloration appears
within the aperture.
The type and one other specimen, Cat. No. 186993, U.S.N.M., were
collected at Port Alfred (Coll. No. 525). The type has the last seven
whorls and measures: Length, 33.5 mm.; diameter, 11.8 mm.
Cat. No. 186998, U.S.N.M., contains an additional specimen from
the same locality (Coll. No. 530).
CLAVATULA HELENA, new species.
Plate 8, fig. 2.
Shell moderately large, spindle shaped, ground color wax yellow,
upon which are disposed blotches and streaks of chestnut brown. On
the spire, the anterior half of the intercostal spaces between the
sutures, is brown; nuclear whorls decollated; postnuclear whorls
flattened, with a narrow, well-rounded keel posterior to the sinus;
the sinus itself appears as a well-impressed, broad, shallow sulcus, the
two extending over the posterior half of the shell between the sutures.
The anterior half is marked with feeble, decidedly protractive, axial
ribs, of which 8 occur upon the first and second, 10 upon the third
and fourth, and 12 upon the penultimate turn. The spaces between
these ribs are about as wide as the ribs. In addition to the above
sculpture, the spire is marked by exceedingly fine lines of growth.
Sutures moderately impressed; periphery of the last whorl well
rounded. Base moderately long, marked by the feeble continuations
of the axial ribs, and about 20 poorly denned spiral threads which are
separated by narrow, incised lines. These threads are a little better
developed on the anterior half than on the posterior half of the base.
Aperture elongate-oval; posterior angle acute; outer lip quite thick,
notched at the sinus; inner lip appressed to the base; parietal wall
covered by a very thick callus.
The type and two specimens, Cat. No. 227761, U.S.N.M., come
from Port Alfred (Coll. No. 856). The type has lost the nuclear
whorls and probably the first post nuclear turn. The six remaining
measure: Length, 28 mm. ; diameter, 12 mm.
CLAVATULA, species?
Cat. No. 186995, U.S.N.M., contains a worn specimen from Port
Alfred allied to C. lialiplex (Coll. No. 527).
Genus DRILLIA Gray.
DRILLIA ROUSI Sowerby.
Cat. No. 186673, U.S.N.M., two specimens from Port Alfred (Coll.
No. 29).