Bulletin - United States National Museum - Smithsonian Institution

108 BULLETIN 91, UNITED STATES NATIONAL MUSEUM.
TRIPHORIS NINA, new species.
Plate 11, fig. 8.
Shell elongate-conic, light chestnut brown, excepting the tuber-
cles of the cord at the summit on each turn, which have a purplish
tinge. (Nuclear whorls decollated. ) Postnuclear whorls very slightly
rounded, ornamented on the first four turns by two spiral tuber-
culated cords, one of which is at the summit and the tubercles of the
other slope to the suture. Beginning with the fifth turn, a slender
spiral thread makes its appearance half way between the two,
which increases rapidly in size and assumes tubercles on the follow-
ing turns. On the seventh turn, another spiral thread makes its
appearance half way between the median and basal cord. This
likewise increases in size, and on the last three turns the tubercles
of these two cords are a*s strong as those of the first and fourth.
In addition to the spiral cords the whorls are marked by low, rather
broad, feeble, axial ribs, of which 16 occur upon the first to third,
18 upon the fourth and fifth, 20 upon the sixth to eighth, 22 upon
the ninth, and 24 upon the last turn. These ribs are moderately
protractive on the first five turns and become very strongly so on
the last. The junction of the axial ribs and the spiral cords form
moderately strong tubercles, which are oval on the first two cords,
having their long axis parallel with that of the spiral sculpture.
On the last two cords they are truncated anteriorly, sloping gently
posteriorly. The spaces inclosed between the axial ribs and spiral
cords are shallow, oval pits. Sutures channeled. Periphery of the
last whorl marked by a sulcus as strong as those of the spire, and
like those, crossed by the continuation of the axial ribs. Base well
roimded, marked by three subequal spiral cords, which divide the
space below the periphery and the insertion of the columella, into
equal areas. Aperture decidedly channeled anteriorly; outer lip
(fractured) ; columella short, stout, twisted, covered with a thick
callus which extends over the parietal wall.
The type, Cat. No. 250352, U.S.N.M., comes from Port Alfred
(Coll. No. 1225), it has lost the nucleus and probably the first post-
nuclear turn; the 10J remaining measure: Length, 5 mm.; diameter,
1.5 mm.
TRIPHORIS IMA, new species.
Plate 10, fig. 6.
Shell large, yellowish white, spotted and blotched with very light
chestnut brown. (Nuclear whorls decollated in all our specimens.)
Postnuclear whorls flattened, marked with four strong, flattened,
spiral keels which are about as wide as the deep grooves which sepa-
rate them. The first of these keels is at the summit and is a little
wider than the other three. The space separating this from its