Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 175
Hope. Cat. No. 16671, U.S.N.M., two specimens from tne Cape of
Good Hope. Cat. No. 42848, U.S.N.M., one specimen from the Cape
of Good Hope. Cat. No. 89089, U.S.N.M., one specimen from the
Cape of Good Hope. Cat. No. 98004, U.S.N.M., two specimens from
Albany. Cat. No. 186885, U.S.N.M., one specimen from Port Alfred
(Coll. No. 255). Cat. No. 227786, U.S.N.M., three specimens from
the same locality (Coll. No. 8S1).
HALIOTIS PERTUSA Reeve.
Cat. No. 33, U.S.N.M., three specimens collected by William Stimpson
on the North Pacific Exploring Expedition at the Cape of Good
Hope.
HALIOTIS PARVA Linnaeus.
Cat. No. 187116, U.S.N.M., two specimens from Port Alfred (Coll.
No. 662). Cat. No. 187117, U.S.N.M., one specimen from the same
place (Coll. No. 663). Cat. No. 176, U.S.N.M., one specimen collected
by William Stimpson on the North Pacific Exploring Expedition at
False Bay. Cat. No. 16970, U.S.N.M., one specimen from Cape of
Good Hope. Collected by Carpenter.
HALIOTIS ALFREDENSIS, new species.
Plate 24, figs. 7, 8.
Shell elongate-ovate, irregularly mottled with chestnut brown and
very pale olive buff flecks and dottings. The space between the base
and the perforations is brown, with narrow radiating bands of pale
olive buff which are about one-fourth as wide as the brown bands.
The sculpture consists of fine, radiating, decidedly retractively slant-
ing threads on the early whorls, which become somewhat coarser,
wider, and less sharply defined on the last half turn., and numer-
ous fine spiral lirations which become more or less wavy anteriorly.
The space between, the perforations and the base is slightly concave
on the posterior half and well rounded on the anterior half, and
marked by the continuation of the lines of growth and wavy spiral
striations. The nacre of the interior has a rosy flush, and a weak red
wash within the spire. The spiral sculpture is apparent on the in-
side. This shell has the shape of Haliotis midae, but lacks the rugose
sculpture of the exterior, the sculpture resembling more that of
Haliotis pertusa, but differing from this in being much finer and more
regular.
The type, Cat. No. 250517, U.S.N.M., comes from Port Alfred (Coll.
No. 1390). It measures : Altitude, 12 mm. ; length, 55 mm. ; diameter,
39.5 mm.
Family SCTSSURELLIDAE.
Genus SCISSURELLA Orbigny.
SCISSURELLA JUCUNDA Smith.
Three lots of this species are in the collection of the United States
National Museum, all from Port Alfred. They are: Cat. No. 187097,