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, uni- 

 formly 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, nar- 

 rowly 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 meas- 

 ures: 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). 



