Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 21
DRILLIA CAFFRA Smith.
Cat. No. 186674, U.S.N.M., four specimens from Port Alfred (Coll.
No. 30).
DRILLIA SIGNA, new species.
Plate 7, fig. 4.
Shell broadly conic. Nuclear whorls rose colored, the later portion
of the shell horn yellow, with a broad chestnut band, which extends
from the periphery anteriorly, over one-third of the base, gradually
paling to fuse with the ground color. Whorls moderately rounded,
strongly, tabulatedly shouldered at the summit. The portion
between the angle near the summit and the periphery is crossed by
low, broad axial ribs, of which 14 occur upon the fourth and fifth and
16 upon the last whorl. On the base of the last whorl these ribs
gradually become evanescent. In addition to the axial ribs, the
whorls are marked by lines of growth and numerous fine, closely
spaced spiral striations, which are about as wide as the spaces that
separate them. These spiral striations occur equally strong at the
shoulder of the summit and on the base. Aperture moderately large;
posterior angle decidedly obtuse; sinus very shallow, forming the
angle at the shoulder; outer lip thin, showing the external color markings
within ; inner edge of the columella and parietal wall glazed with
a thin callus.
Th£ type, Cat, No. 250457, U.S.N.M., comes from Port Alfred
(Coll. No. 1330). It has seven whorls and measures: Length, 14 mm.
diameter, 6.2 mm.
DRILLIA LAYARDI Sowerby.
Cat, No. 186675, U.S.N.M., three specimens from Port Alfred (Coll.
No. 31). Cat. No. 272113, U.S.N.M., two from South Africa.
DRILLIA DIVERSA Smith.
Cat. No. 186676, U.S.N.M., three specimens from Port Alfred (Coll.
No. 32).
DRILLIA BAIRSTOWI Sowerby.
Cat. No. 186677, U.S.N.M., four specimens from Port Alfred (Coll.
No. 33). Two additional specimens, Cat. No. 249732, U.S.N.M., come
from the same place (Coll. No. 1004).
DRILLIA HOTTENTOTA Smith.
Cat. No. 186678, U.S.N.M., seven specimens from Port Alfred (Coll.
No. 34). Also Cat. No. 187007, U.S.N.M., two young individuals
from the same locality (Coll. No. 540) and Cat. No. 187008, U.S.N.M.,
another immature shell from the same place (Coll. No. 541). Cat.
No. 272117, U.S.N.M., one from South Africa.
DRILLIA ALBONODULOSA Smith.
Cat. No. 186679, U.S.N.M., two specimens from Port Alfred (Coll.
No. 35).
80737°—Bull. 91—15 3
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