Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 165
posterior two cords on the base. Umbilicus broad and funnel shaped,
the umbilical wall being marked by three weak spiral cords. Aper-
ture irregular, ovate; outer and basal lips very thick, rendered sinuous
by the external sculpture; inner lip very thick, almost vertical, somewhat
curved ; parietal wall covered b} r a moderately thick callus.
The type and another specimen, Cat. No. 187109, U.S.N.M. (Coll.
No. 655), come from Port Alfred. The type has four postnuclear
whorls, and measures: Altitude, 4.5 mm.; greater diameter, 8 mm.;
lesser diameter, 7 mm. Cat. No. 227781, U.S.N.M. (Coll. No. 876),
contains three specimens from the same locality. Cat. No. 250513,
U.S.N.M., another specimen from the same place (Coll. No. 1386).
CYNISCA AFRICANA, new species.
Plate 28, figs. 4, 5, 6.
Shell small, white. Nuclear whorls a little more than two, smooth,
well rounded, separated by a well impressed suture. Postnuclear
whorls almost two, well rounded, ornamented between the sutures
by three strong spiral keels of which the first, which is a little anterior
to the summit, is nodulous. The deep grooves separating these
strong keels are a little wider than the keels. The axial sculpture is
reduced to exceedingly fine retractive lines of growth. Periphery
of the last whorl marked by a strong keel which equals the one posterior
to it in strength and is separated from this by a sulcus as deep
and broad as that which separates the keel posterior to it from its
posterior neighbor. Base deeply umbilicated, moderately well
rounded, marked by four strong spiral cords of which the last bounds
the umbilicus. This and the one next to it are tuberculated, while
the two posterior to it are smooth. The deep, broad sulci separating
these spiral cords are crossed by fine axial lines of growth. Aperture
oblique, oval; outer lip very thick; inner lip thick, decidedly curved;
parietal wall covered with a thick callus.
The type and two specimens, Cat. No. 187098, U.S.N.M., come
from Port Alfred (Coll. No. 642). The type measures: Altitude, 2
mm.; greater diameter, 2.6 mm. This species resembles Cynisca
forticostata very much, but is at once distinguished from it by its
minute size. Cat. No. 250514, U.S.N.M., one specimen from Port
Alfred (Coll. No. 1387).
Genus TEINOSTOMA H. and A. Adams.
TEINOSTOMA AFRICANA Smith.
Cat. No. 86884, U.S.N.M., contains two specimens from Port Al-
fred (Coll. No. 254).
TEINOSTOMA ALFREDENSIS, new specie!.
Plate 28, figs. 7, 8, 9.
Shell small, white. Nucleus consisting of a single smooth turn.
Postnuclear whorls two and one-third, well rounded, marked by
80737°—Bull. 91—15 12