Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 185
Genus PHILOBRYA Carpenter.
PHILOBRYA AFRICANA, new species.
Plate 46, figs. 1, 2.
Shell small, translucent, white, broadly triangular, with the beaks
at the apex of the triangle. Dorsal edge slightly curved, ventral
somewhat concaved; posterior portion well rounded. The junction
of the posterior and dorsal edges form somewhat of an angle and give
the shell an alate aspect. The external surface of the shell is marked
by fine concentric lines of growth and numerous, exceedingly fine,
irregularly radiating, hair-like streaks which give to the surface a
silky luster.
The type and another specimen, Cat. No. 187154, U.S.N.M., come
from Port Alfred (Coll. No. 70 1 ) . The
type measures : Length, 5 mm.
diameter, 4 mm.
In addition to these, the United States National Museum contains
five lots, all from Port Alfred, as follows: Cat. No. 227811, six valves
(Coll. No. 906); Cat. No. 227812, five valves (Coll. No. 907); Cat.
No. 249841, two specimens (Coll. No. 1113); Cat. No. 251001, one
valve (Coll. No. 1518); Cat. No. 251007, one valve (Coll. No. 1524).
Family PTERIIDAE.
Genus MARGARITIPHORA Muhlfeld.
MARGARITIPHORA NATALENSIS Jameson.
Cat. No. 17225, U.S.N.M., contains a specimen from the Cape of
Good Hope.
MARGARITIPHORA CAPENSIS Sowerby.
Cat. No. 186914, U.S.N.M., one specimen from Port Alfred (Coll.
No. 284).
Family OSTREIDAE.
Genus OSTREA Lamarck.
OSTREA ALGOENSIS Sowerby.
Cat. No. 175, U.S.N.M., contains a specimen collected by William
Stimpson on the North Pacific Exploring Expedition at Simons Bay,
on rocks at low water. In addition to this, the United States National
Museum contains 14 lots from Port Alfred, as follows: Cat. No.
187163, four specimens (Coll. No. 710); Cat. No. 187164, one specimen
(Coll. No. 711); Cat. No. 187165, eight valves (Coll. No. 712);
Cat. No. 249833, two young specimens (Coll. No. 1105); Cat. No.
250981, one specimen (Coll. No. 1498); Cat. No. 250982, two valves
(Coll. No. 1499); Cat. No. 250983, one specimen (Coll. No. 1500);
;