Bulletin - United States National Museum - Smithsonian Institution

208 BULLETIN 91, UNITED STATES NATIONAL MUSEUM.
DONAX SORDIDUS Hanley.
Cat. No. 186957, U.S.N.M., one and one-half specimens from Port
Alfred (Coll. No. 327).
DONAX BIPARTITUS Pilsbry.
Cat. No. 160861, U.S.N.M., one specimen from South Africa.
DONAX SIMPLEX Sowerby.
There are three lots of this species in the collection of the United
States National Museum, all from Port Alfred, as follows: Cat. No.
187176, one specimen (Coll. No. 725); Cat. No. 251027, one valve
(Coll. No. 1544); Cat. No. 251034, one specimen and one valve (Coll.
No. 1551).
DONAX BURNUPI Sowerby.
Cat. No. 187175, U.S.N.M., one valve from Port Alfred (Coll. No.
724). Cat. No. 251028, U.S.N.M., one valve (Coll. No. 1545). Cat.
No. 251036, U.S.N.M., one valve (Coll. No. 1553).
Family SOLENIDAE.
Genus SOLEN Linnaeus.
SOLEN ALFREDENSIS, new species.
Plate 40, figs. 1,2.
Shell subcylindric, laterally compressed, gaping anteriorly and
posteriorly, obliquely truncated anteriorly, well rounded posteriorly.
The valves have a very strong constriction immediately posterior to
the anterior margin. They are marked with fine lines of growth
only.
The type and another specimen, Cat. No. 227816, U.S.N.M., come
from Port Alfred (Coll. No. 911). The type measures: Altitude, 15
mm.; length, 96.5 mm.; diameter, 11 mm.
SOLEN CAPENSIS Fischer.
There are three lots of this species in the collection of the United
States National Museum, all from Port Alfred, as follows: Cat. No.
186960, one specimen (Coll. No. 330)
mens (Coll. No. 1130); Cat. No. 251021, two young specimens (Coll.
No. 1538).
Family MACTRIDAE.
Genus SCHIZODESMA Gray.
SCHIZODESMA SPENGLERI Linnaeus.
; Cat. No. 249858, three speci-
Cat. No. 86, U.S.N.M., one specimen collected by William Stimpson
on the North Pacific Exploring Expedition at False Bay, Cape of