Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 183
BARBATIA CAFRIA, new species.
Plate 38, figs. 1, 5.
Shell small, rather gibbous, the umbones salmon colored, the rest
yellowish white. The epidermis, when present, dark chocolate
brown. The two valves similarly sculptured, the epidermis forming
strong setae on every third radiating riblet, while the two intermediate
ones seem simply to be covered with a smooth integument.
There are 29 of the setaceous ribs on each valve and double that
number of the intermediary ones. The riblets bearing the setae are
strongly nodulose, while the others are almost smooth. Liganiental
area narrow, marked by transverse grooves. Interior white.
The type and another specimen of this species, Cat. No. 249849,
U.S.N.M., come from Port Alfred (Coll. No. 1121). The type measures:
Altitude, 8.5 mm.; length, 14.2 mm.; diameter, 8.6 mm.
Cat. No. 187156, U.S.N.M., contains four additional valves from
the same place (Coll. No. 703).
Family PINNIDAE.
Genus PINNA Lamarck.
PINNA SQUAMIFERA Sowerby.
Cat. No. 187159, U.S.N.M., two specimens from Port Alfred (Coll.
No. 706). Cat. No. 227814, U.S.N.M., contains two additional
specimens from the same locality (Coll. No. 909).
Genus ATRINA Gray.
ATRINA ALFREDENSIS, new species.
Plate 40, fig. 3.
Shell depressed pyriform; hom colored, darker at the tip. The in-
terior is dull horn colored, excepting the tip, which is smoky pearly.
Upper side slightly curved ; the ventral edge decidedly concave ; pos-
terior portion decidedly expanded. The surface is marked with five
poorly developed and poorly expressed radiating ridges beset with
decidedly elevated squamations, which are strongest on the three
median ridges. The ventral border is rendered rasp-like by fine
poorly developed squamations.
The type and another specimen, Cat. No. 227815, U.S.N.M., come
from Port Alfred (Coll. No. 910). The type measures: Length, 73
mm.; greater diameter, 50 mm.
ATRINA AFRA Sowerby (?).
Cat. No. 187160, U.S.N.M., contains fragments of probably this
species from Port Alfred (Coll. No. 707). Cat. No. 250991, U.S.N.M.,
contains another fragment of this species, from the same locality
(CoU. No. 1508).