Bulletin - United States National Museum - Smithsonian Institution

194 BULLETIN 91, UNITED STATES NATIONAL MUSEUM.
Family ASTARTIDAE.
Genus DIGITARIA Wood.
DIGITARIA AFRICANA, new species.
Plate 45, fig. 4; plate 54, fig. 9.
Shell oval, bluish white. Umbones almost at the anterior end.
Surface marked with moderately strong lines of growth and numerous,
feebly expressed, radiating riblets which are about as wide as the
spaces that separate them. In addition to this sculpture, the sur-
face is marked by rather regularly spaced, strongly incised grooves,
which pass obliquely across the lines of growth, bending upward
toward the lunule and posteriorly toward the hinge line. The latter
ones, however, terminate at the posterior ventral margin. The
external sculpture is shown on the inner surface. Ventral border
finely denticulated. The hinge is shown in our detailed figure.
Cat. No. 187184, U.S.N.M., contains the type, which comes from
Port Alfred (Coll. No. 735). This is a left valve, and measures:
Altitude, 3 mm.; length, 3.7 mm.
The hinge in the type, when compared with Digitaria digitaria
Linnaeus, appears reversed; that is, our left valve corresponds with
the armature of the right valve of that species.
Family CHAMIDAE.
Genus CHAMA Bruguiere.
CHAMA GRYPHINA Lamarck (?).
Cat. No. 250994, U.S.N.M., contains a rather poor specimen, from
Port Alfred, which may be this species (Coll. No. 1511).
Family LUCINIDAE.
Genus LUCINA Bruguiere.
LUCINA GLOBOSA Forskal.
Cat. No. 98235, U.S.N.M., one valve collected by Dr. Holub, from
Swartkop River, South Africa. Cat. No. 186964, U.S.N.M., two
valves from Port Alfred (Coll. No. 335). Cat. No. 251020, U.S.N.M.,
an additional valve from the same place (Coll. No. 1537).
Genus LORIPES Poli.
LORIPES CLAUSUS Philippi.
Cat. No. 186961, U.S.N.M., one specimen from Port Alfred (Coll.
No. 332).
Genus PHACOIDES Blainville.
PHACOIDES VALIDA Smith.
There are three lots of this species in the collection of the United
States National Museum, all from Port Alfred, as follows: Cat. No.
186963, two specimens (Coll. No. 334); Cat. No. 187187, two valves
(Coll. No. 738); Cat. No. 227818, one specimen (Coll. No. 913).