Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 89
clear turns well rounded, ornamented with strong spiral keels, of
which two occur upon the first and second, while upon the third the
anterior one is divided by a slender incised line which gradually in-
creases in strength on the succeeding turns, splitting this cord into
two equal and equally strong cords equaling the posterior one, on
the last turn. On the last two turns the infraperipheral cord
makes its appearance in the suture. We have, therefore, four cords
shown between the sutures on the last turn. Summit of the whorls
tabulatedly shouldered, the first cord beginning at the angle of the
shoulder. The grooves separating the spiral cords are strongly im-
pressed. The one immediately posterior to the supraperipheral cord
is a little stronger than the rest. In addition to the spiral sculpture
the whorls are marked by feeble lines of growth on the spire, which
appear strongest in the spiral grooves. Sutures strongly constricted.
Periphery of the last whorl marked by a spiral sulcus. Base moder-
ately long, well rounded, very narrowly umbilicated, marked by 11
spiral cords, the five anterior to the periphery being much stronger
than the six remaining, which are very fine. Aperture oval; poste-
rior angle obtuse; outer lip thin, rendered sinuous by the spiral sculp-
ture, showing the external sculpture within; inner lip short, strongly
curved, reflected and appressed to the preceding turn, provided with
a very strong oblique fold opposite the umbilical chink; parietal wall
covered by a strong callus.
The type, Cat. No. 271615, U.S.N.M., comes from Port Alfred (Coll.
No. 1599). It has six postnuclear whorls, and measures: Length, 3.3
mm.; diameter, 1.5 mm.
ODOSTOMIA (EVALEA) LUCIDA Sowerby.
Cat. No. 186853, U.S.N.M., contains two specimens from Port
Alfred (Coll. No. 220).
ODOSTOMIA (EVALEA) LAVERTINAE Smith.
Cat. No. 186852, U.S.N.M., contains six specimens from Port
Alfred (Coll. No. 219).
We have seen 33 additional specimens from Port Alfred in Colonel
Turton's collection (Coll. No. 1589).
ODOSTOMIA (EVALEA) AETHRA, new species.
Plate 19, fig. 7.
Shell elongate-conic, white. Nuclear whorls deeply immersed in
the first of the succeeding turns, above which a very small portion
of the tilted edge of the last volution only projects. Postnuclear
whorls well rounded; feebly shouldered, at the summit; marked
with fine, incremental lines, and exceedingly fine, microscopic, spiral
striations. Periphery of the last whorl somewhat inflated, feebly