Bulletin - United States National Museum - Smithsonian Institution

86 BULLETIN 91, UNITED STATES NATIONAL MUSEUM.
preceding turn for half its length; parietal wall glazed with a thin
callus.
The type, Cat. No. 250369, U.S.N.M., comes from Port Alfred
(Coll. No. 1242), has four postnuclear whorls, and measures: Length,
1.5 mm.; diameter, 0.6 mm.
ODOSTOMIA (EGILINA) TURTONI, new species.
Plate 19, fig. 3.
Shell small, elongate-conic, milk white. Nuclear whorls, at least
two, deeply, obliquely, immersed in the first of the succeeding turns.
Postnuclear whorls moderately rounded, feebly shouldered at the
summit; marked by very regular, somewhat sinuous, slightly pro-
tractive axial ribs, of which 24 occur upon the first, 26 upon the
second and third, and about 40 upon the last turn. These ribs are
separated by well-impressed intercostal spaces which are about equal
to the axial ribs in width. In addition to the spiral sculpture the
whorls are marked between the sutures by a strong spiral cord which
adjoins the suture. The summit of the whorls is rendered slightly
crenulated by the curving of the ribs. Sutures strongly impressed;
periphery of the last whorl marked by a narrow sulcus, which is
crossed by the continuations of the axial ribs; base short, moderately
umbilicated, marked by feeble, thread-like continuations of the axial
ribs and six low, well-rounded, weak spiral threads, which diminish
greatly in size and spacing from the periphery to the umbilical area,
where they are quite obsolete. Aperture quite large, oval; posterior
angle acute; outer lip thin, showing the external sculpture within;
inner lip strongly curved and slightly reflected; parietal wall covered
by thick callus.
The type and three specimens, Cat, No. 227733, U.S.N.M., (Coll.
No. 828) , come from Port Alfred. The type has almost five postnuclear
whorls, and measures: Length, 2 mm.; diameter, 0.9 mm.
ODOSTOMIA (PYRGULINA) ARFICA, new species.
Plate 18, fig. 7.
Shell elongate-ovate, rather solid, bluish white. Nuclear whorls
decollated. Postnuclear whorls well rounded, strongly shouldered
at the summit, marked by stout, well-rounded, somewhat sinuous,
decidedly pro tractive, axial ribs, which are about as wide as the spaces
that separate them. Of these ribs, 14 occur upon the first, 16 upon
the second, 18 upon the third, and 22 upon the penultimate turn.
These ribs render the summit of the whorls decidedly crenulated. In
addition to the ribs the intercostal spaces are marked between the
sutures by exceedingly fine, closely spaced, spiral striations, of which
about 35 are present upon the third turn. Sutures strongly impressed.
Periphery of the last whorl well rounded. Base moder-