SOUTH AFRICAN MARINE MOLLUSKS. 31 



below the appressed summit, otherwise well rounded, marked by 

 strong, narrow, somewhat sinuous, almost vertical axial ribs, of 

 which 12 occur upon all the turns. Intercostal spaces almost three 

 times as wide as the ribs, crossed by 18 equal and almost equally 

 spaced, strongly incised, spiral lines between the sutures. Periphery 

 of the last whorl well rounded. Base attenuated, marked by the 

 continuations of the axial ribs on the posterior half, and about 12 

 incised spirals, which equal those of the spire in strength and spac- 

 ing. Aperture irregular, outer Up slightly reflected at the posterior 

 angle to form a shallow notch, the rest decidedly inbent; columella 

 somewhat sigmoid, covered by a thin callus which extends up on the 

 parietal wall. 



The type and one other specimen, Cat. No. 186688, U.S.N.M., were 

 collected at Port Alfred (Coll. No. 46) . It has lost the first nuclear 

 whorl, the six remaining measure: Length, 6.6 mm.; diameter, 

 2.2 mm. 



MANGILIA PONSONBYI Sowerby. 



Cat. No. 186685, U.S.N.M., three specimens from Port Alfred 

 (Coll. No. 41). 



MANGILIA, species? 



Cat. No. 250468, U.S.N.M., contains a 3 7 oung specimen from Port 

 Alfred, which appears to be different from any of the species recorded 

 from South Africa, but is too poor to serve as a basis for description 

 (Coll. No. 1341). 



MANGILIA SIREN Smith. 



Cat. No. 186691, U.S.N. M., contains a specimen from Port Alfred 

 (Coll. No. 50). This was described as Glyphostoma siren Smith, but 

 I believe it should range with Mangilia. 



Genus CYTHARA Schumacher. 



CYTHARA ALFREDENSIS Smith. 



The United States National Museum has five lots of this species 

 from Port Alfred. They are: Cat. No. 186689, eight specimens 

 (Coll. No. 47). Cat. No. 227759, six specimens (Coll. No. 854). 

 Cat. No. 227760, six specimens (Coll. No. 855). Cat. No. 252110, 

 five specimens (Coll. No. 1603); and Cat. No. 252111, five speci- 

 mens (Coll. No. 1604). 



In addition to these, I have seen 44 of (Coll. No. 1603) and 45 of 

 (Coll. No. 1604), which have been returned to Col. Turton. 



CYTHARA IMA, new species. 

 Plate 3, fig. 1. 



Shell white. Nuclear whorls two, smooth. Postnuclear whorls 

 moderately rounded, with closely appressed summits marked by 

 weak, depressed, rather broad, slightly protractive axial ribs, of 



