Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 31
below the appressed summit, otherwise well rounded, marked by
strong, narrow, somewhat sinuous, almost vertical axial ribs, of
which 12 occur upon all the turns. Intercostal spaces almost three
times as wide as the ribs, crossed by 18 equal and almost equally
spaced, strongly incised, spiral lines between the sutures. Periphery
of the last whorl well rounded. Base attenuated, marked by the
continuations of the axial ribs on the posterior half, and about 12
incised spirals, which equal those of the spire in strength and spac-
ing. Aperture irregular, outer Up slightly reflected at the posterior
angle to form a shallow notch, the rest decidedly inbent; columella
somewhat sigmoid, covered by a thin callus which extends up on the
parietal wall.
The type and one other specimen, Cat. No. 186688, U.S.N.M., were
collected at Port Alfred (Coll. No. 46) . It has lost the first nuclear
whorl, the six remaining measure: Length, 6.6 mm.; diameter,
2.2 mm.
MANGILIA PONSONBYI Sowerby.
Cat. No. 186685, U.S.N.M., three specimens from Port Alfred
(Coll. No. 41).
MANGILIA, species?
Cat. No. 250468, U.S.N.M., contains a 3 7oung specimen from Port
Alfred, which appears to be different from any of the species recorded
from South Africa, but is too poor to serve as a basis for description
(Coll. No. 1341).
MANGILIA SIREN Smith.
Cat. No. 186691, U.S.N.M., contains a specimen from Port Alfred
(Coll. No. 50). This was described as Glyphostoma siren Smith, but
I believe it should range with Mangilia.
Genus CYTHARA Schumacher.
CYTHARA ALFREDENSIS Smith.
The United States National Museum has five lots of this species
from Port Alfred. They are: Cat. No. 186689, eight specimens
(Coll. No. 47). Cat. No. 227759, six specimens (Coll. No. 854).
Cat. No. 227760, six specimens (Coll. No. 855). Cat. No. 252110,
five specimens (Coll. No. 1603); and Cat. No. 252111, five specimens
(Coll. No. 1604).
In addition to these, I have seen 44 of (Coll. No. 1603) and 45 of
(Coll. No. 1604), which have been returned to Col. Turton.
CYTHARA IMA, new species.
Plate 3, fig. 1.
Shell white. Nuclear whorls two, smooth. Postnuclear whorls
moderately rounded, with closely appressed summits marked by
weak, depressed, rather broad, slightly protractive axial ribs, of