Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 151
tuberculated. In addition to the above sculpture, the entire surface
of the post-nuclear whorls is marked by very many, narrow, lamellar,
axial threads, which pass over the grooves between the spiral cords
and also the tubercles of the ridges. Sutures moderately impressed.
Periphery rendered feebly angulated by a spiral cord. Base short,
deeply and broadly umbilicated, marked with eight equal and equally
spaced, strong, nodulous spiral cords and an equal number of weak
nodulous spiral threads which occur half-way between the strong
cords. One of these slender threads also occurs between the strong
peripheral cord and the first basal. In addition to the above, the
entire surface is marked by the continuations of the slender lamellar
riblets. No ribs are apparent within the umbilicus. Aperture
rhomboidal; outer lip rendered sinuous by the external sculpture,
which is also true of the basal Up; inner lip oblique, straight; parietal
wall not covered with a callus.
The type, Cat. No. 186871a, U.S.N.M., comes from Port Alfred
(Coll. No. 241a). The type has a little more than two and one-half
post-nuclear whorls, and measures: Altitude, 7.2 mm.; greater diameter,
8.7 mm.
CLANCULUS WALTONAE Sowerby.
Cat. No. 187105, U.S.N.M., one specimen from Port Alfred (Coll.
No. 650). Cat. No. 227779, U.S.N.M., one specimen from the same
locality (Coll. No. 874).
CLANCULUS MERULOIDES Krauss.
Cat. No. 18680, U.S.N.M., one specimen from Cape of Good Hope.
Genus OXYSTELE Philippi.
OXYSTELE MERULA Lamarck.
Cat. No. 104, U.S.N.M., three specimens collected by William
Stimpson on the North Pacific Exploring Expedition at the Cape
of Good Hope. Cat. No. 36801, U.S.N.M., one specimen from the
Cape of Good Hope. Cat. No. 90152, U.S.N.M., two specimens
from the same locality. Cat. No. 98008, U.S.N.M., three specimens
from the Peddie coast, South Africa. Cat. No. 186881, U.S.N.M.,
three specimens from Port Alfred (Coll. No. 251).
OXYSTELE TIGRINA Anton.
Cat. No. 98, U.S.N.M., two specimens collected by William Stimpson
on the North Pacific Exploring Expedition at the Cape of Good
Hope. Cat. No. 104a, U.S.N.M., six specimens collected by the
same party at the same place. Cat. No. 98022, U.S.N.M., seven
specimens from Peddie and Albany, South Africa. Cat. No. 186880,
U.S.N.M., three specimens from Port Alfred (Coll. No. 250).
Cat. No. 250491, U.S.N.M., three young specimens from the
same locality (Coll. No. 1364).