Bulletin - United States National Museum - Smithsonian Institution

106 BULLETIN 91, UNITED STATES NATIONAL MUSEUM.
poorly separated, low, rounded, slightly protractive, axial ribs, of
which 16 occur upon the first and second, 18 upon the third, 20 upon
the fourth to sixth, and 24 upon the penultimate whorl. The
junction of these ribs and the spiral cords form poorly defined tuber-
cles. Those on the first cord being very illdefined and oval, while
those on the median cord are oval and truncated anteriorly and
posteriorly, having the long axis parallel with the spiral sculpture,
appearing like a series of strung beads. Those of the anterior cord
are truncated posteriorly and are well rounded anteriorly. Sutures
channeled, a little more strongly so than the space between the spiral
cords of the spire. Periphery of the last whorl marked by a spiral
sidcus about as wide as the sulci on the spire and like those crossed
by the continuation of the axial ribs which terminate at the posterior
edge of the first basal cord. Base moderately rounded, marked by
four spiral cords which grow successively weaker from the first, im-
mediately below the periphery, to the last, which is on the base of
the columella. In addition to this sculpture, the entire surface is
marked by exceedingly fine lines of growth and microscopic, spiral
striations. Aperture rather large, decidedly channeled anteriorly, less
so posteriorly, patulous at the junction of the outer and basal lip;
outer lip thin, showing the external sculpture within and rendered
sinuous at the edge by the external sculpture; columella covered by
a thick callus, which is reflected over the parietal wall and renders
the peritreme complete.
The type, and another specimen, Cat. No. 249677, U.S.N.M., come
from Port Alfred (Coll. No. 949a). The type is a perfect specimen
having the four nuclear turns and eight postnuclear whorls, and
measures: Length, 6.5 mm.; diameter, 2 mm.
TRIPHORIS, species?
Cat. No. 249677, U.S.N.M., contains a pure white specimen, recalling
strongly in sculpture TripJioris milda, but it is of a much
smaller species with four basal keels; it is not quite adult and we
refrain from describing it for the present till better material may
be had. It comes from Port Alfred (Coll. No. 949a).
TRIPHORIS SABITA, new species?
Plate 11, fig. 7.
Shell small, elongate-conic, ovate, light brown, excepting the
tips of the tubercles which are flesh colored. The extreme tip
of the shell is wax-yellow and the outer lip is white. Nuclear whorls
a little more than two, the first smooth, the second finely transversely
ribbed, the riblets having slender nodules, the first of which
is near the summit, the other immediately above the suture. Postnuclear
whorls moderately rounded, the first two ornamented by two
nodulose, spiral cords, the first of which is at the summit and the