Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 63
EPITONIUM TENEBROSUM Sowerby.
Cat No 186836 U.S.N.M., contains two specimens of this species,
from Port Alfred (Coll. No. 203). Cat. No. 249716, U.S.N.M.,
contains two additional specimens from the same locality. (Coll.
No. 988).
EPITONIUM DURBANENSE Smith.
Cat. No. 186838, U.S.N.M., two specimens from Port Alfred (Coll.
No. 205).
EPITONIUM LACTEUM Krauss.
Cat. No. 145, U.S.N.M., one specimen collected by William Stimpson
on the North Pacific Exploring Expedition, at False Bay, Cape
of Good Hope, Cat. No. 186839, U.S.N.M., three specimens from
Port Alfred (Coll. No. 206).
EPITONIUM AGLAIA, new species.
Plate 17, fig. 4.
Shell elongate-conic, white. (Nuclear whorls decollated.) Post-
nuclear whorls well rounded; marked by numerous, very retractive
axial ribs which are about one-half as wide as the spaces that sepa-
rate them, and an occasional varix. The latter are irregularly distributed
Of the axial ribs, 28 occur upon the first and second of the
remaining whorls, 30 upon the third, 36 upon the fourth, 40 upon the
fifth, and 42 upon the penultimate turn. In addition to the axial
ribs ' the whorls are marked by numerous spiral striations, which are
more closely crowded at the summit than on the rest of the whorl.
About 34 of these lirations occur between the sutures on the penultimate
turn. Sutures strongly constricted. Periphery of the last
whorl marked by a feeble angulation. Base moderately long, well
rounded, marked by closely crowded, spiral striations. Aperture
subcircular; outer lip forming a thickened peristome; inner lip strongly
curved and somewhat reflected; parietal wall covered with a thick
callus, which renders the peritreme complete.
The type, Cat. No. 187037, U.S.N.M., comes from Port Alfred
(Coll No 574) It has seven postnuclear whorls remaming, and
measures: Length, 12 mm.; diameter, 6 mm. Cat No -250412,
U.S.N .M., contains another specimen from Port Allred (Coll. JNo.
1285).
EPITONIUM, species?
Cat No. 250411, U.S.N.M., contains the tip of a broadly conic
little Epitonium, which has fine axial ribs, and spiral lirations in the
intercostal spaces. It is different from any Epitomum known from
South Africa and comes from Port Alfred (Coll. No. 1284).