Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 87
ately long, narrowly umbilicated, well rounded, marked by the feeble
continuation of the axial ribs, and numerous spiral striations Aper-
ture oval; posterior angle obtuse; outer lip rather thick; inner lip
decidedly curved, and somewhat reflected, provided with a very
strong, oblique fold at its insertion; parietal wall covered by a thick
callus, which renders the peritreme practically complete.
The tvpe, and another specimen, Cat. No. 249693, U.S.N.M., come
from Port Alfred (Coll. No. 965) ; the type has five postnuclear whorls,
and measures: Length, 4 mm.; diameter, 1.9 mm.
ODOSTOMIA (MIRALDA) AGANA, new species.
Plate 19, fig. 8.
Shell conic, white. Nuclear whorls, at least two, deeply, obliquely
immersed in the first of the succeeding turns, above which the tilted
edge of the last volution projects. Postnuclear whorls moderately
rounded, shouldered at the summit, ornamented with slender, pro-
tractive, axial ribs, of which 16 occur upon the first and second, 18
upon the third, and 22 upon the penultimate turn. These ribs
extend prominently to the summit of the whorls, which they render
crenulated. In addition to the axial sculpture the whorls are marked
by two prominent spiral cords between the sutures, of which the
first occupies the middle of the turns, while the second is halfway
between this and the suture. The intersections of the axial ribs
and the spiral cords form well-rounded nodules. Periphery of the
last whorl marked by a sulcus. Sutures strongly constricted Base
moderately long, somewhat produced, narrowly umbilicated, pro-
vided with a strong spiral cord, which bounds the peripheral sulcus
The anterior part of the base is smooth, excepting rnrnute lines ot
growth, which are also apparent on the spire. Aperture oval; outer
Hp very thin, showing the external sculpture within, decidedly sinuous
at the edge; inner lip strongly curved, slightly reflected, free, provided
with a strong fold at its insertion; parietal wall glazed with a
thin callus. . ., ,
The type, Cat. No. 186848a, U.S.N.M., comes from Port Alfred
(Coll No 215a) It has 5 postnuclear whorls, and measures : Length,
2.4 mm. ;"
diameter, 1 mm. Cat. No. 227728, U.S.N.M., contains three
specimens from the same locality (Coll. No. 823).
ODOSTOMIA (MENESTHO) CARIFA, new species.
Plate 18, fig. 5.
Shell very small, subcylindric, cream yellow. Nuclear whorls well
rounded, smooth, deeply, obliquely inserted in the first of the succeed-
in^ turns, above which the tilted edge of the last volution only projects.
Postnuclear whorls strongly rounded, appressed at the summit,
marked by two strongly incised, spiral grooves, of which the first is