Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 193
Cat. No. 98038, U.S.N.M., four specimens from Albany. Cat. No,
186927, U.S.N.M., two specimens from Port Alfred (Coll. No. 297).
Cat. No. 227817, U.S.N.M., two specimens from the same locality
(Coll. No. 912).
Genus MIODONTISCUS Dall.
MIODONTISCUS MINIMUS Smith.
There are four lots of this species in the collection of the United
States National Museum, all from Port Alfred, as follows: Cat. No.
186932, four and one-half specimens (Coll. No. 302)
our valves (Coll. No. 1128); Cat. No. 249857, four valves (Coll. No.
1129); Cat. No. 251008, two valves (Coll. No. 1525).
Family CONDYLOCARDIIDAE.
Genus CONDYLOCARDIA Smith.
CONDYLOCARDIA IO, new species.
Plate 48, fig. 1; plate 54, figs. 7, 8.
; Cat. No. 249856,
Shell irregularly oval, rather inflated, thin, semitranslucent.
Prodissoconch forming a conspicuous shield having an elevated
mammilate area at its apex, separated from the succeeding portion
of the shell by a strongly raised ridge. Succeeding portion of the
shell marked by very fine concentric threads which become slightly
stronger as the shell attains maturity. The character of the hinge
is shown by the detailed sketch.
Cat. No. 251066, U.S.N.M., contains two specimens of this species
from Port Alfred (Coll. No. 1583). The type measures: Altitude,
2.3 mm.; length, 2.6 mm.
Genus CARDITELLA Smith.
CARDITELLA RUGOSA Sowerby.
Cat. No. 186928, U.S.N.M., three specimens from Port Alfred
(Coll. No. 298).
Genus CARDITOPSIS Smith.
CARDITOPSIS ALFREDENSIS, new species.
Plate 48, fig. 4; plate 54, figs. 3, 4.
Shell minute, subtrigonal, rather thick, bluish white, marked by
feebly impressed lines of growth, and very weak, low, radiating
threads. Edge of the shell thick all around. Basal margin weakly
crenulated. The character of the hinge is shown in our detailed
sketch.
The type and another valve, Cat. No. 251005, U.S.N.M., come from
Port Alfred (Coll. No. 1522). The type measures: Altitude, 2 mm.;
length, 1.7 mm.