Bulletin - United States National Museum - Smithsonian Institution

66 BULLETIN 91, UNITED STATES NATIONAL MUSEUM.
the suture is scarcely apparent, while the posterior limit of the body
cavity shining through the substance of the shell assumes the appearance
of a suture. The whorls are marked at irregular intervals by
slightly impressed axial lines marking varices. Periphery of the last
whorl well rounded. Base produced. Aperture oval; posterior
angle very acute; outer lip thin at the edge, produced into a clawlike
element midway between the base and the posterior angle; inner lip
thick, slightly curved, reflected over and adnate to the body whorl;
parietal wall covered by a thin callus.
The type, Cat. No. 250384, U.S.N.M., comes from Port Alfred
(Coll. No. 1257). It has 10 whorls, and measures: Length, 4.1 mm.;
diameter, 1.2 mm.
A young specimen from the same locality is entered as Cat. No.
250383, U.S.N.M (Coll. No. 1256).
MELANELLA ICAFRA, new species.
Plate 20, fig. 3.
Shell very small, stout, decidedly twisted, semitranslucent. Nuclear
whorls well rounded. Postnuclear turns appressed at the summit,
well rounded, polished, marked by an occasional varix. The posterior
limit of the inside of the whorls shining through the substance of the
shell appears as a false suture. Sutures scarcely visible. Periphery
of the last whorl slightly angulated, inflated. Base prolonged, in-
flated, and well rounded. Aperture rather large; posterior angle
acute; outer lip drawn forward in the middle into a claw-like element;
inner lip thin, reflected over and adnate to the body whorl; parietal
wall glazed by a thin callus.
The type and another specimen, Cat. No. 250380, U.S.N.M., come
from Port Alfred (Coll. No. 1253). The type has seven whorls,
and measures: Length, 2.2 mm.; diameter, 1 mm.
MELANELLA ALFREDENSIS, new species.
Plate 19, fig. 5.
Shell small, elongate-conic, slightly falcate, almost transparent,
bluish white. The whorls are slightly rounded, appressed at the
summit, through which the preceding whorl shines, giving the shell
the aspect of having a double suture. Suture feebly impressed.
Periphery well rounded. Base attenuated, well rounded; entire
surface polished and marked by exceedingly fine, incremental lines
and an occasional, irregularly disposed varix. Aperture ovate; outer
lip somewhat clavate; inner lip appressed; gently curved; parietal
wall glazed with a thin callus.
The type, Cat. No. 187076, U.S.N.M., comes from Port Alfred
(Coll. No. 617). It has eight postnuclear whorls, and measures:
Length, 4 mm.; diameter, 1.2 mm.