SOUTH AFRICAN MARINE MOLLTJSKS. 83 



TURBONILLA (CINGULINA) AGLAIA, new species. 



Plate 17, fig. 3. 



Shell elongate-conic, subdiaphanous, bluish-white. Nuclear whorls 

 small, at least two; depressed helicoid, obliquely one-third immersed 

 in the first of the succeeding turns. Postnuclear whorls moderately 

 rounded, marked by three strong spiral striatums between the sutures 

 on the early whorls, while on the later ones the peripheral cord be- 

 comes completely exposed in the suture, giving these whorls four 

 spiral cords. These spiral cords are truncated posteriorly and slope 

 gently anteriorly. They are a little wider than the grooves that 

 separate them. The grooves are crossed by numerous, very slender, 

 somewhat protractive axial riblets. Sutures scarcely differentiated 

 from the spiral grooves. Periphery of the last whorl bounded pos- 

 teriorly by a spiral groove; anteriorly there is no limiting groove to 

 denote the peripheral cord, which is apparent in the suture on the 

 preceding turns, the periphery here passing evenly into a short, well- 

 rounded base, which is marked by exceedingly fine, spiral striations 

 and lines of growth. Aperture subquadrate; posterior angle obtuse; 

 outer lip thin, showing the external sculpture within, rendered 

 wavy at the edge by the external sculpture ; inner lip decidedly curved 

 and slightly reflected, provided with a weak fold at its insertion; 

 parietal wall glazed with a thin callus. 



The type and two specimens, Cat. No. 186850, U.S.N.M., come 

 from Port Alfred (Coll. No. 217). The type has eight and one-half 

 postnuclear whorls, and measures: Length, 5.3 mm.; diameter, 1.5 mm. 

 Cat. No. 250398, U.S.N.M., contains two additional specimens from 

 Port Alfred (Coll. No. 1271). 



TURBONILLA (CINGULINA) PELLUCIDA Sowerby. 



Cat. No. 186854, U.S.N.M., contains three specimens of this species, 

 which was described as Cioniscus pelluddus Sowerby, from Port Alfred 

 (Coll. No. 222). 



TURBONILLA (CINGULINA) CALLISTA, new species. 



Plate 17, fig. 2. 



Shell elongate-conic, very slender, white. Nuclear whorls at least 

 two, small, depressed helicoid, obliquely one-third immersed in the 

 first of the succeeding turns. Postnuclear whorls well rounded, 

 marked between the sutures by three very strong, incised, spiral 

 grooves, of which one is immediately below the summit, the second 

 on the middle of the whorls, and the third about as far posterior to 

 the suture as the first is anterior to the summit. The axial sculpture 

 consists of vertical incremental lines only. Periphery and base of 

 the last whorl well rounded, marked by incremental lines only. 

 Aperture oval; posterior angle acute; outer lip thin, showing the 



