SOUTH AFRICAN MARINE MOLLUSKS. 23 



The type, Cat. No. 187001, U.S.N .M., and another specimen come 

 from Port Alfred (Coll. No. 533). The type has seven whorls and 

 measures: Length, 13.6 mm.; diameter, 5.8 mm. Cat. No. 272118 

 U.S.N.M., one from Port Elizabeth, South Africa. 



DRILLIA HALIDOMA, new species. 



Plate 2, fig. 9. 



Shell robust, rufous orange. Whorls with a narrow, obscurely 

 nodulous keel immediately below the summit, followed by a sulcus 

 that is a little wider than the keel, the two almost equaling the width 

 of the spaces between the sutures. Anterior half of the whorl 

 between the sutures inflated, of much greater diameter than the rest 

 of the whorls, marked by very broad, low, rounded, slightly protec- 

 tive, axial ribs, which terminate posteriorly in rounded knobs, while 

 anteriorly they extend feebly over the periphery and part of the 

 base. There are 12 of these ribs on the early whorls and 14 upon 

 the penultimate. Posterior part of base well rounded, anterior part 

 produced, which renders the left outline of the base concave. Entire 

 surface of spire and base marked by incremental lines and fine, wavy, 

 spiral striatums on the subsutural keel and sulcus. The ribbed parts 

 of the spire and base are marked by slender raised lirations, of which 

 3 appear between the sutures and 8 on the base, the latter becoming 

 successively narrower from the periphery to the extremity of the 

 base. Aperture irregularly ovate; posterior angle acute, sinus deep, 

 somewhat below the summit; outer lip decidedly curved; columella 

 moderately long, slightly sigmoid, covered by a thin callus, which 

 extends upon the parietal wall. 



The type, Cat. No. 90678, U.S.N.M., comes from the Cape of 

 Good Hope. It has lost the early whorls; the 6 remaining measure: 

 Length, IS. 6 mm.; diameter, 9.6 mm. 



DRILLIA, species? 



Cat. No. 97917, U.S.N.M., a young individual from Cape of Good 

 Hope, which can not be referred to any of the forms listed from South 

 Africa. 



Genus MANGILIA (Leach) Risso. 



MANGILIA CAPENSIS Smith. 



Cat. No. 186684, U.S.N.M., three species from Port Alfred (Coll. 

 No. 40). Cat. No. 272119, U.S.N.M., two from South Africa. 



MANGILIA DINA, new species. 

 Plate 2, fig. 1. 



Shell milk white. Nuclear whorls 2h, dextral, forming a low apex, 

 the first small and smooth, the second much larger, marked by very 

 slender riblets and fine spiral lirations which increase in strength 



