Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLTJSKS. 83
TURBONILLA (CINGULINA) AGLAIA, new species.
Plate 17, fig. 3.
Shell elongate-conic, subdiaphanous, bluish-white. Nuclear whorls
small, at least two; depressed helicoid, obliquely one-third immersed
in the first of the succeeding turns. Postnuclear whorls moderately
rounded, marked by three strong spiral striatums between the sutures
on the early whorls, while on the later ones the peripheral cord becomes
completely exposed in the suture, giving these whorls four
spiral cords. These spiral cords are truncated posteriorly and slope
gently anteriorly. They are a little wider than the grooves that
separate them. The grooves are crossed by numerous, very slender,
somewhat protractive axial riblets. Sutures scarcely differentiated
from the spiral grooves. Periphery of the last whorl bounded pos-
teriorly by a spiral groove; anteriorly there is no limiting groove to
denote the peripheral cord, which is apparent in the suture on the
preceding turns, the periphery here passing evenly into a short, wellrounded
base, which is marked by exceedingly fine, spiral striations
and lines of growth. Aperture subquadrate; posterior angle obtuse;
outer lip thin, showing the external sculpture within, rendered
wavy at the edge by the external sculpture ; inner lip decidedly curved
and slightly reflected, provided with a weak fold at its insertion;
parietal wall glazed with a thin callus.
The type and two specimens, Cat. No. 186850, U.S.N.M., come
from Port Alfred (Coll. No. 217). The type has eight and one-half
postnuclear whorls, and measures: Length, 5.3 mm.; diameter, 1.5 mm.
Cat. No. 250398, U.S.N.M., contains two additional specimens from
Port Alfred (Coll. No. 1271).
TURBONILLA (CINGULINA) PELLUCIDA Sowerby.
Cat. No. 186854, U.S.N.M., contains three specimens of this species,
which was described as Cioniscus pelluddus Sowerby, from Port Alfred
(Coll. No. 222).
TURBONILLA (CINGULINA) CALLISTA, new species.
Plate 17, fig. 2.
Shell elongate-conic, very slender, white. Nuclear whorls at least
two, small, depressed helicoid, obliquely one-third immersed in the
first of the succeeding turns. Postnuclear whorls well rounded,
marked between the sutures by three very strong, incised, spiral
grooves, of which one is immediately below the summit, the second
on the middle of the whorls, and the third about as far posterior to
the suture as the first is anterior to the summit. The axial sculpture
consists of vertical incremental lines only. Periphery and base of
the last whorl well rounded, marked by incremental lines only.
Aperture oval; posterior angle acute; outer lip thin, showing the