Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 177
Genus FISSURIDEA Swainson.
FISSURIDEA ELIZABETHAE Smith.
Cat. No. 186891, U.S.N.M, one specimen from Port Alfred (Coll.
No. 261).
FISSURIDEA SPRETA Smith.
Cat. No. 186893, U.S.N.M., one specimen from Port Alfred (Coll.
No. 263).
FISSURIDEA ELEVATA Dunker.
Cat. No. 98040, U.S.N.M., two specimens from Peddie or Albany,
South Africa. Cat. No. 186894, U.S.N.M., one specimen from Port
Alfred (Coll. No. 264).
FISSURIDEA CALYCULATA Sowerby.
Cat. No. 98039, U.S.N.M., four specimens from Peddie, South
Africa. Cat. No. 186892, U.S.N.M., one specimen from Port Alfred
(Coll. No. 262). Cat. No. 249778, U.S.N.M., three young specimens
from the same place (Coll. No. 1050). Cat. No. 249779, U.S.N.M.,
three additional young specimens from the same locality (Coll. No.
1051).
FISSURIDEA AUSTRALIS Krauss.
Cat. No. 227801, U.S.N.M., two specimens from Port Alfred (Coll.
No. 896).
FISSURIDEA PARVIFORATA Smith.
Cat. No. 187134, U.S.N.M., three specimens from Port Alfred (Coll.
No. 680). Cat. No. 250569, U.S.N.M., an additional specimen from
Port Alfred (CoU. No. 1442).
Genus PUNCTURELLA Lowe.
PUNCTURELLA AFRICANA, new species.
Plate 30, figs. 4, 5.
Shell small, white, exceedingly delicate. The nucleus consisting of
a little more than one whorl, the coil resting on the left side of the
postnuclear portion of the shell. The postnuclear part of the shell
increases very rapidly in size, the sides being marked by about 40
thread-like radial riblets which are a little more densely spaced on
the anterior portion. These are crossed almost at right angles by a
second series of raised threads which equal the first in strength and
spacing, thus lending the surface a finely reticulated aspect. The
plug filling the notch is transversely notched. The shell is so thin
that all the external markings are seen within.
The type, Cat. No. 187135, U.S.N.M., comes from Port Alfred
(Coll. No. 681). It measures: Altitude, 1.1 mm.; long diameter, 1.9
mm.; transverse diameter, 1.3 mm.