Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 41
MARGINELLA, species?
Cat. No. 250321, U.S.N.M., contains a young white individual, of
moderate size, broad outline, and quadruplicate columella, which we
are unable to refer to any of the known species. Port Alfred (Coll.
No. 1194).
MARGINELLA ALFREDENSIS, new species.
Plate 1, fig. 2; plate 10, fig. 4.
Shell elongate-ovate, bluish white, semitranslucent. The whorls are
so arranged as to overlap partly at the summit, which gives the summit
a broadly, evenly rounded aspect. The left margin of the shell
is well rounded. The outer lip is flattened in the middle, curving
gently toward the summit above this, and a little more abruptly
basally. Aperture narrow, lunate, a little wider basally than anteriorly;
outer lip thickened at the edge; inner lip appressed to the body
whorl, with a thin callus, the basal portion of which terminates in
a slender fasciole. The inner lip is armed with eight subequally
spaced folds which diminish in size from the first, which equals the
basal fasciole in strength, to the last.
The type and three specimens of this species, Cat. No. 186727,
U.S.N.M., come from Port Alfred (Coll. No. 86). The type has four
and one-half whorls and measures : Length, 2.5 mm. ; diameter, 1.7 mm.
Eight additional lots of this species, all from Port Alfred, are in the
collection of the United States National Museum. Cat. No. 186990,
six specimens (Coll. No. 522) ; Cat. No. 250338, three specimens (Coll.
No. 1211); Cat. No. 250340, one specimen (Coll. No. 1213); Cat. No.
250341, 11 specimens (Coll. No. 1214); Cat. No. 250339, one specimen
(Coll. No. 1212); Cat. No. 250337, one specimen (Coll. No. 1210);
Cat. No. 250344, one specimen (Coll. No. 1217); Cat, No. 250342, 12
specimens (Coll. No. 1215).
MARGINELLA ALGOENSIS Smith.
Five lots of this species are in the collection of the United States
National Museum, all from Port Alfred. Cat, No. 186722, four specimens
(Coll. No. 81). Cat. No. 249665, three specimens (Coll. No.
937); Cat, No. 249664, six specimens (Coll. No. 936); Cat, No. 250335,
two specimens (Coll. No. 1208); Cat. No. 250336, one specimen
(Coll. No. 1209).
MARGINELLA ALMO, new species.
Plate 21, fig. 1.
Shell ovate, semitranslucent, milk white. Spire short, broadly,
roundedly conic Suture slightly impressed. Surface marked with
exceedingly fine lines of growth only. Aperture very long, widening
somewhat anteriorly; outer lip thickened at the edge and very finely
denticulated on the inner margin, the denticulations extending