Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 179
mens (Coll. No. 1484); Cat. No. 250612, one specimen (Coll. No.
1485); Cat No. 250613, one specimen (Coll. No. 1486); Cat. No.
250614, three specimens (Coll. No. 1487); Cat. No. 250615, two
specimens (Coll. No. 1488); Cat. No. 250616, one specimen (Coll. No.
1489); Cat. No. 250617, one specimen (Coll. No. 1490); Cat. No.
250618, two specimens (Coll. No. 1491); Cat. No. 250619, one specimen
(Coll. No. 1492) ; Cat. No. 250620, one specimen (Coll. No. 1493)
Cat. No. 250621, one specimen (Coll. No. 1494).
ISCHNOCmTON TIGRINUS Krauss.
Cat. No. 177, U.S.N.M., contains a specimen collected by William
Stimpson on the North Pacific Exploring Expedition on the Cape of
Good Hope. Cat. No. 110252, U.S.N.M., contains three specimens
from the same place. In addition to these, there are four lots in the
collection of the United States National Museum from Port Alfred,
as follows: Cat. No. 249818, one specimen (Coll. No. 1090); Cat. No.
250604, one specimen (Coll. No. 1477) ; Cat. No. 250607, one specimen
(Coll. No. 1480); Cat No. 250624, one specimen (Coll. No. 1497).
Genus DINOPLAX Carpenter.
DINOPLAX GIGAS Gmelin.
Cat. No. 110201, U.S.N.M., one specimen from the Cape of Good
Hope. In addition to this, the United States National Museum has
seven lots from Port Alfred, as follows: Cat. No. 186908, two valves
(Coll. No. 278); Cat. No. 229832, one specimen (Coll. No. 1104);
Cat. No. 249829, four specimens (Coll. No. 1101); Cat No. 249830,
two complete specimens (Coll. No. 1102); Cat. No. 250600, one specimen
(Coll. No. 1473); Cat. No. 250601, one specimen (Coll. No. 1474);
Cat. No. 250602, one specimen (Coll. No. 1475).
DINOPLAX GIGAS ALFREDENSIS, new subspecies.
Plate 39, figs. 1, 2.
Shell similar to Dinoplax gigas in outline and coloring, but with the
sculpture in every way much finer. Radiating lines of the lateral
areas and the anterior plate only very feebly expressed, with the
central very finely truncate as compared with D. gigas.
The type, Cat. No. 249831, U.S.N.M., comes from Port Alfred
(Coll. No. 1103); it measures: Length, 62 mm.; diameter, 22 mm.
Another specimen is registered as 249820, U.S.N.M., and comes from
the same locality (Coll. No. 1092).
DINOPLAX FOSSUS Sykes.
Cat. No. 249823, U.S.N.M., contains a young specimen from Port
Alfred (Coll. No. 1095).
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