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 speci- 

 mens. (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. Post- 

 nuclear 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. Post- 

 nuclear 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 



