Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MAKINE MOLLUSKS. 123
tion to these I have seen four lots which have been returned to
Colonel Turton, all from Port Alfred; they are: (Coll. No. 1591) 45
specimens. (Coll. No. 1595) 14 specimens. (Coll. No. 1597) 172 specimens.
(Coll. No. 1598) 44 specimens.
DIALA CAPENSIS, new species.
Plate 6, fig. 10.
Shell small, subcylindric, pupiform, semitranslucent, pale yellow.
Nuclear whorls not differentiated from the postnuclear turns. Postnuclear
whorls somewhat inflated, appressed at the summit, through
which the preceding whorl is visible, which lends the shell the appear-
ance of having a double suture. The entire surface of the shell is
marked by numerous retractive lines of growth and exceedingly fine
spiral striations. Sutures strongly constricted. Periphery of the last
whorl rounded. Base well rounded, narrowly umbilicated. Aper-
ture moderately large, oval, outer lip very thin; inner lip strongly
curved and slightly reflected over the umbilicus. Parietal wall cov-
ered with a thin callus.
The type, Cat. No. 187068a, comes from Port Alfred. (Coll. No.
606.) It has six and one-half postnuclear whorls, and measures:
Length, 2.5 mm.; diameter, 1.1 mm.
DIALA ALMO, new species.
Plate 6, fig. 2.
Shell minute, broadly conic, with truncated apex, semitranslucent.
Nuclear whorls not differentiated from the postnuclear turns. Postnuclear
whorls feebly rounded, appressed at the summit, through which
the preceding turn shows, lending the surface the aspect of .having a
double suture. Entire surface of the shell marked by fine lines of
growth. Sutures feebly impressed. Periphery of the last whorl
strongly inflated. Base well rounded, broadly umbilicated. Aper-
ture very large; ovate; posterior angle obtuse; outer lip thin, decidedly
flaring; inner lip curved and somewhat flexuous, slightly reflected
over the umbilicus; parietal wall distinct, rendering the peritreme
complete.
The type, Cat. No. 187066, U.S.N.M. comes from Port Alfred,
(Coll. No. 604). It has five whorls, and measures: Length, 2 mm.;
diameter, 1.2 mm. We have seen seven additonal specimens from
Port Alfred (Coll. No. 593), which have been returned to Colonel
Turton.
Family SOLARIIDAE.
Genus HELIACUS Orbigny.
HELIACUS AFRICANUS, new species.
Plate 24, figs. 1, 3, 5.
Shell lenticular, brown, blotched and spotted with white and yel-
low. Nuclear whorls about one and a half, smooth; upper surface