Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 51
larly placed varices and many, very regular, and regularly, closely
spaced, slender, raised, axial threads which are about as wide as the
spaces that separate them. Spirally the whorls are marked by about
16 slender threads, between the sutures, which are a little less
strong than the axial markings and also less regular. The spaces
inclosed between the axial and spiral threads appear as narrow oblong
pits whose long diameter coincides with the spiral sculpture. Sutures
well impressed. Periphery of the last whorl well rounded. Base pro-
longed, marked like the spire but not as strongly. Aperture strongly
channeled anteriorly, posterior angle narrow, obtuse; outer lip thickened
by a varix, columella sinuous, covered by a strong, decidedly
reflected callus which extends up on the parietal wall.
The type and one other specimen, Cat. No. 187017, U.S.N.M., came
from Port Alfred (Coll. No. 551). The type has the last six whorls
which measure : Length, 33.5 mm.; diameter, 11.5 mm.
Family ALECTRIONIDAE.
Genus ALECTRION Montfort.
ALECTRION CAPENSIS Dunker.
The United States National Museum has ten lots of this species,
Cat. No. 18164, five specimens from Cape of Good Hope, Cat. No.
21756, one collected by Dunker at Algoa Bay. Cat. No. 43022, nine
specimens from Cape of Good Hope. Cat. No. 77793, nine from the
same locality collected by Layard. Cat. No. 90609, two from Cape
of Good Hope. Cat. No. 91459, six from the same place. Cat. No.
98013, twelve from Albany. Cat. No. 186755, three from Port
Alfred (Coll. No. 116). Cat. No. 186759, one from the same place
(Coll. No. 120). Cat. No. 187196, one from the same locality (Coll.
No. 65). Cat. No. 272121 U.S.N.M.,two specimens from South Africa.
ALECTRION CRAWFORDI Sowerby.
Cat. No. 186754, U.S.N.M., two from Port Alfred (Coll. No. 115).
ALECTRION KOCHTANA Dunker.
Cat. No. 21757, U.S.N.M., one specimen collected by Dunker in
Algoa Bay. Cat. No. 227764, US.N.M., five specimens from Port
Alfred (Coll. No. 859), and Cat. No. 227765, U.S.N.M., two specimens
from the same locality (Coll. No. 860), and Cat. No. 250453, U.S.N.M.,
two from the same place (Coll. No. 1326).
ALECTRION QUANTULA Gould.
Gould's type, Cat. No. 224, U.S.N.M., collected by William Stimpson
on the North Pacific Exploring Expedition at Simons Bay,
agrees in every way with Nassa poecilosticta Smith. The latter will
therefore have to be considered a synonym of Nassa quantula Gould,
the present species. Cat. No. 186756, U.S.N.M., contains four specimens
from Port Alfred (Coll. No. 117).