Bulletin - United States National Museum - Smithsonian Institution

SOUTH AFRICAN MARINE MOLLUSKS. 139
The type and another specimen of this species, Cat. No. 46445,
U.S.N.M., come from the Cape of Good Hope. The type has four and
one-half whorls, and measures : Length, 1 1 .3 mm. ; diameter, 1 1 mm.
Cat. No. 249753, U.S.N .M., contains another specimen from Port Alfred
(Coll. No. 1025).
NATICA NAPUS Smith.
Cat. No. 186832, U.S.N.M., contains one specimen from Port Alfred
(Coll. No. 198).
NATICA DECIPIENS Smith.
Cat. No. 186831, U.S.N .M., contains two specimens from Port Alfred
(Coll. No. 197).
NATICA QUEKETTI Sowerby.
Cat. No. 464455, U.S.N.M., one specimen from the Cape of Good
Hope.
NATICA, species?
Cat. No. 187084, U.S.N.M., contains three specimens from Port
Alfred (Coll. No. 626), which we are unable to refer to any of the
known species, but they are too worn to permit a proper diagnosis.
Cat. No. 250485, U.S.N.M., contains one specimen from the same
locality in an equally poor condition (Coll. No. 1358). Cat. No.
249751, U.S.N.M., another specimen also in poor condition (Coll. No.
1023).
NATICA NEMO, new species.
Plate 13, figs. 6, 9, 12.
Shell subglobose, narrowly umbilicated, moderately elevated, uniformly
cream colored. Nuclear whorls two and one- third, moderately
well rounded, smooth. Postnuclear whorls well rounded, marked by
numerous, very decided notchings, which are strongest near the
summit, weakening gradually as they pass over the whorls; on the
early whorls they extend to the suture. Suture feebly impressed.
Periphery of the last whorl well rounded. Base well rounded, narrowly
umbilicated. The periphery and the base are marked by the
feeble continuations of the impressed lines. The umbilicus is almost
closed by a strong, spiral callus, which occupies the middle of the
umbilical wall. The callus on the parietal wall is interrupted at the
posterior termination of the spiral umbilical callus where a deep
notch is present; outer lip thin at the edge, colored very light brown
within.
The type has three postnuclear whorls, and the whole shell measures:
Length, 14.2 mm.; diameter, 13.8 mm. It comes from Port
Alfred, and is Cat. No. 1S7083, U.S.N.M. (Coll. No. 625).