Bulletin - United States National Museum - Smithsonian Institution

162 BULLETIN 91, UNITED STATES NATIONAL MUSEUM.
ing with the spiral sculpture. In addition to the spiral sculpture the
whorls are marked by fine, decidedly retractive lines of growth.
Sutures moderately constricted. Periphery of the last whorl strongly
angulated, marked by a cord about doubly as wide as those occurring
on the spire. Base very short, well rounded, slightly concaved at the
umbilical area, marked by 20 spiral cords which, on the posterior
half, are subequal and subequally spaced, while those on the anterior
half are alternately wider and narrower. The spaces between the
cords equal the cords in width. Aperture rhomboidal; outer lip thin,
showing the external sculpture within by transmitted light; ren-
dered feebly wavy by the external sculpture at the edge, which is
also true of the basal lip. The junction of the basal and outer lips
forms almost a right angle; columella very oblique, strongly curved
and partly reflected over the base as a smooth callus.
The type, Cat. No. 97988, U.S.N.M., and three specimens of this
species come from Albany and Peddie, South Africa. The type has
six and one-half postnuclear whorls, and measures: Altitude, 20 mm.;
greater diameter, 20 mm.
Some of the specimens in our collection are suffused with a purple
color. It seems remarkable that this large species should have been
overlooked so long. In our collection it has appeared under the names
of Calliostoma rufopunctata , ornata, and bicingulatum.
Cat. No. 18711, U.S.N.M., contains three specimens from the Cape
of Good Hope. Cat. No. 186872, U.S.N.M., three specimens from
Port Alfred (Coll. No. 242). Cat. No. 187102, U.S.N.M., one specimen
from Port Alfred (Coll. No. 646). Cat. No. 250516, U.S.N.M.,
two young specimens from the same locality (Coll. No. 1389).
CALLIOSTOMA AFRICANA, new species.
Plate 24, figs. 2, 4, 6.
Shell regularly conic, flesh colored, with squarish maculations of
chestnut brown, the latter occupy a zone extending from the
periphery to the middle of the whorl, and are separated from each
other by a space about equal to the width of the brown spots. On
the base the spiral cords are dotted with maculations of the same
color. Nuclear whorls, at least two, apparently smooth. The postnuclear
whorls are marked by spiral cords and axial riblets forming
tubercles at their junction, thus lending the spiral cords a granulated
appearance. Of these cords, 3 occur upon the first, 4 upon the sec-
ond, 7 upon the third, 8 upon the fourth, and 10 upon the penultimate
turn between the periphery and the summit. These spiral
cords are separated on all but the last whorl by spaces about equal
to the cords in width. On the last turn, however, the sulci are
broader and the tuberculated cords are less regular than on the pre-
ceding turns. Sutures slightly constricted. Periphery of the last