Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 103
The type and another specimen, Cat. No. 249685, U.S.N.M., come
from Port Alfred (Coll. No. 957). The type has 13$ postnuclear
whorls, and measures: Length, 9.6 mm.; diameter, 3 mm.
TRIPHORIS OREADA, new species.
Plate 11, fig. 4.
Shell elongate-conic, flesh colored. Nuclear whorls decollated, ex-
cepting a very small portion of the last turn, which is smooth. Post-
nuclear turns marked by three lamellar, spiral keels, which are very
feebly tuberculated. Of these keels the first is at the summit and the
last about as far above the suture as it is from the median, which is half
way between the other two. These spiral lamellae are truncated
abruptly anteriorly and posteriorly and are somewhat flattened at the
summit and are about as wide as the spaces that separate them. In
addition to the spiral lamellae, the whorls are marked by numerous,
feeble, slightly retractive axial ribs, which are best developed in the
grooves between the spiral lamellae, passing up on the sides of these
and rendering them weakly nodulous on the two sides. Of these ribs,
about 20 occur upon the first' to third, 22 upon the fourth to sixth,
24 upon the seventh, 26 upon the eighth, 28 upon the ninth to eleventh
and 30 upon the penultimate turn. The spaces inclosed between the
spiral lamellae and the axial riblets are squarish, weakly impressed
pits. Periphery of the last whorl marked by a spiral cord a little
weaker than the lamellae on the spire and separated from the supra-
peripheral cord by a sulcus about as wide as those on the spire, which is
crossed by the feeble continuations of the axial riblets. Base provided
with another spiral cord which is half way between the peripheral cord
and the insertion of the columella. Aperture very strongly twisted
and channeled anteriorly, slightly less so posteriorly; outer lip patulous,
thin, showing the external sculpture within; columella very
much twisted and curved, covered with a thick callus which also extends
over the parietal wall and renders the peritreme complete.
Cat. No. 249682, U.S.N.M., contains the type and another specimen,
both from Port Alfred (Coll. No. 954). The type has 13 whorls,
and measures: Length, 8.8 mm.; diameter, 2.1 mm.
TRIPHORIS, species?
Cat. No. 187045, U.S.N.M., contains a young, broadly conic, brown
species, from Port Alfred, which differs from any of the other material
we have seen from South Africa, but is too young to be positvely determined
(Cat. No. 583).
TRIPHORIS AFRICANA, new species.
Plate 5, fig. 11.
Shell elongate-conic, light chestnut brown, except the nucleus
and the early post-nuclear whorls which are wax yellow, with the