Bulletin - United States National Museum - Smithsonian Institution

110 BULLETIN 91, UNITED STATES NATIONAL MUSEUM.
strongly impressed pits. Sutures strongly impressed. Periphery
of the last whorl marked by a strong spiral cord, which is separated
from the first supraperipheral cord by a groove about as wide as those
separating the cords on the spire, and, like these, is crossed by the
continuations of the axial ribs, which terminate at the posterior bor-
der of the peripheral cord. Base moderately long, somewhat irregu-
lar, the peripheral cord extending over one-third of the base, while a
strong spiral cord encircles the columella at its insertion, the space
between this and the peripheral cord being a very deeply impressed,
broad, spiral groove. Anterior to the cord marking the insertion of
the columella, there is another deeply incised, broad, spiral groove.
Aperture irregular, decidedly channeled anteriorly; posterior angle
channeled ;
outer
lip irregular, sinuous ; columella strong, curved and
reflected over and appressed to the base; parietal wall covered by a
thick callus which connects the columella with the posterior angle
of the aperture.
The type, Cat. No. 186803, U.S.N.M., was collected at Port Alfred
(Coll. No. 169) . It has 10 postnuclear whorls, and measures: Length,
5 mm. ; diameter, 1.5 mm. Three additional lots are in the collection
of the United States National Museum, all from Port Alfred. Cat.
No. 227727, two specimens (Coll. No. 822). Cat. No. 249692, one
specimen (Coll. No. 964). Cat. No. 250355, one specimen (Coll.
No. 1228).
CERITHIOPSIS (CERITHIOPSIS) EXQUISITA Sowerby.
Cat. No. 227726, U.S.N.M., two specimens from Port Alfred (Coll.
No. 821). Another specimen, Cat. No. 250359, U.S.N.M., also comes
from Port Alfred (Coll. No. 1232).
CERITHIOPSIS ERNA, new species.
Plate 12, fig. 6.
Shell very light chestnut brown. (Nuclear whorls decollated.)
Postnuclear whorls very slightly rounded; marked by three tubercu-
lated spiral cords, of which the first is at the smnmit which it renders
shouldered, while the last is a little posterior to the periphery, and the
second, midway between the two. In addition to the spiral cords,
the whorls are marked by somewhat protractive axial ribs which
almost equal the spiral cords in strength. The junctions of the
axial ribs and the spiral cords form nodules, while the spaces in-
closed between them appear as strongly impressed, squarish pits.
The nodules on the cord at the summit are well rounded, those
on the middle cord are truncated posteriorly, sloping gently ante-
riorly, which is also the case on the thud cord, but here the nodules
are even more abruptly truncated than on the median cord. Of
the axial ribs, 18 occur upon the first to fourth, 20 upon the fifth, 22
upon the sixth and seventh, and 24 upon the penultimate turn. In