Bulletin - United States National Museum - Smithsonian Institution

160 BULLETIN 91, UNITED STATES NATIONAL MUSEUM.
GIBBULA PINTADO Gould.
Plate 28, figs. 10, 11, 12.
Margarita pintado Gould, Proc. Bost. Soc. Nat. Hist., vol. 8, p. 16, 1861.
Shell helicoid, moderately elevated, wax yellow ground color,
marked with elongate brown spots on the spiral keels, which are equal
to the intervening light areas that separate them in length. Color
pattern of base similar to that of the spire. Nuclear whorls one and
one-half, well rounded, smooth. Postnuclear whorls strongly
rounded, marked by seven well rounded, equally developed and
equally spaced, spiral cords on all the turns between the summit and
the periphery. Suture feebly impressed. Periphery of the last
whorl well rounded. Base moderately long, well rounded and narrowly
umbilicated, marked by 15 almost equal and equally spaced
spiral cords; in the spaces between several of these a fine, spiral line is
apparent. Umbilicus without spiral sculpture. The entire surface
is marked with very slender, decidedly, retractively, slanting, regu-
larly spaced axial threads. Aperture oblique, subquadrate; outer lip
thin, rendered wavy on the edge by the external sculpture; columella
stout, very oblique, almost straight; parietal wall covered with a thin
callus.
Gould's type, Cat. No. 213, U.S.N.M., was dredged by William
Stimpson on North Pacific Exploring Expedition, in 12 fathoms, on
sand bottom, in Simons Bay, Cape of Good Hope. It has 3 \ post-
nuclear whorls, and measures: Altitude, 4.5 mm.; greater diameter,
5.6 mm.; lesser diameter, 5.1 mm.
GIBBULA ZONATA Wood.
Cat. No. 123, U.S.N.M., three specimens collected by William
Stimpson on the North Pacific Exploring Expedition in Simons Bay,
Cape of Good Hope. Cat. No. 18697, U.S.N.M., three specimens from
the Cape of Good Hope. Cat. No. 42887, U.S.N.M., six specimens
from the same place. Cat. No. 90127, U.S.N.M., seven specimens
from the same locality. Cat. No. 250497, U.S.N.M., two young specimens
from Port Alfred (Coll. No. 1370) . Cat. No. 250528, two young
specimens from the same locality (Coll. No. 1401). Cat. No. 272126,
U.S.N.M., two from the Cape of Good Hope.
GIBBULA RIFACA, new species.
Plate 32, figs. 4, 5, 6.
Shell sublenticular, wax colored, with irregular blotchings and spot-
tings of very pale chestnut brown; upper surface depressed, helicoid.
The nucleus consists of a little more than one whorl, which is well
rounded and smooth. Postnuclear turns marked by strongly incised
spiral lines, causing the space between them to appear as raised, well