Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 141
on the succeeding. These riblets are about one-third as wide as the
spaces that separate them on the first turn, while on the last turn the
intercostal spaces are only a trifle wider than the riblets. The spaces
between the riblets are crossed by numerous, very fine spiral striatums.
Base gradually, deeply umbilicated. The umbilicus marked
at its outer edge by a strong carina. The entire surface of the base
is marked by the continuation of the axial riblets, which pass undi-
minished over the base, into the umbilicus. The base appears slightly
excavated immediately posterior to this carina. The exterior um-
bilical wall is concave and marked by the continuation of the axial
riblets from aperture; outer lip thickened at the edge; inner lip sin-
uous, slightly reflected, and continuing over the parietal wall, ren-
dering the peritreme complete.
The type, Cat. No. 249769, U.S.N.M., comes from Port Alfred
(Coll. No. 1041). It measures: Altitude, 3 mm. The greatest measurement
obtainable while lying on the aperture is 3 mm. Another
specimen, Cat. No. 250534, U.S.N .M. (Coll. No. 1407), comes from
the same place.
Family ACMAEIDAE.
Genus ACMAEA Eschscholtz.
ACMAEA ROSEORADIATA Smith.
Cat. No. 19319, U.S.N.M., one specimen from the Cape of Good
Hope. Cat. No. 187133, U.S.N.M., two specimens from Port Alfred
(Coll. No. 679). Cat. No. 250573, U.S.N.M., contains another specimen
from the same locality (Coll. No. 1446).
Family PATELLIDAE.
Genus PATELLA Linnaeus.
PATELLA GRANATINA Linnaeus.
The United States National Museum contains eight lots of this
species from the Cape of Good Hope, as follows: Cat. No. 7586, four
specimens collected by William Stimpson on the North Pacific Ex-
ploring Expedition; Cat. No. 7587, ten specimens; Cat. No. 16615,
two specimens ; Cat. No. 17347, two specimens; Cat. No. 89797, three
specimens; Cat. No. 89798, one specimen; Cat. No. 103886, four
specimens; Cat. No. 128388, two specimens. Cat. No. 184355,
U.S.N.M., one specimen from Cape Town. Cat, No. 186902, U.S.N.M.
one specimen from Port Alfred (Coll. No. 272).
PATELLA LONGICOSTA Lamarck.
Cat. No. 109, U.S.N.M., two specimens collected by William Stimpson
on the North Pacific Exploring Expedition at the Cape of Good
Hope. Cat. No. 89835, U.S.N.M., two specimens from the Cape of
Good Hope. Cat. No. 186901, U.S.N.M., three specimens from Port