SOUTH AFRICAN MARINE MOLLUSKS. 89 



clear turns well rounded, ornamented with strong spiral keels, of 

 which two occur upon the first and second, while upon the third the 

 anterior one is divided by a slender incised line which gradually in- 

 creases in strength on the succeeding turns, splitting this cord into 

 two equal and equally strong cords equaling the posterior one, on 

 the last turn. On the last two turns the infraperipheral cord 

 makes its appearance in the suture. We have, therefore, four cords 

 shown between the sutures on the last turn. Summit of the whorls 

 tabulatedly shouldered, the first cord beginning at the angle of the 

 shoulder. The grooves separating the spiral cords are strongly im- 

 pressed. The one immediately posterior to the supraperipheral cord 

 is a little stronger than the rest. In addition to the spiral sculpture 

 the whorls are marked by feeble lines of growth on the spire, which 

 appear strongest in the spiral grooves. Sutures strongly constricted. 

 Periphery of the last whorl marked by a spiral sulcus. Base moder- 

 ately long, well rounded, very narrowly umbilicated, marked by 11 

 spiral cords, the five anterior to the periphery being much stronger 

 than the six remaining, which are very fine. Aperture oval; poste- 

 rior angle obtuse; outer lip thin, rendered sinuous by the spiral sculp- 

 ture, showing the external sculpture within; inner lip short, strongly 

 curved, reflected and appressed to the preceding turn, provided with 

 a very strong oblique fold opposite the umbilical chink; parietal wall 

 covered by a strong callus. 



The type, Cat. No. 271615, U.S.N.M., comes from Port Alfred (Coll. 

 No. 1599). It has six postnuclear whorls, and measures: Length, 3.3 

 mm.; diameter, 1.5 mm. 



ODOSTOMIA (EVALEA) LUCIDA Sowerby. 



Cat. No. 186853, U.S.N.M., contains two specimens from Port 

 Alfred (Coll. No. 220). 



ODOSTOMIA (EVALEA) LAVERTINAE Smith. 



Cat. No. 186852, U.S.N.M., contains six specimens from Port 

 Alfred (Coll. No. 219). 



We have seen 33 additional specimens from Port Alfred in Colonel 

 Turton's collection (Coll. No. 1589). 



ODOSTOMIA (EVALEA) AETHRA, new species. 

 Plate 19, fig. 7. 



Shell elongate-conic, white. Nuclear whorls deeply immersed in 

 the first of the succeeding turns, above which a very small portion 

 of the tilted edge of the last volution only projects. Postnuclear 

 whorls well rounded; feebly shouldered, at the summit; marked 

 with fine, incremental lines, and exceedingly fine, microscopic, spiral 

 striations. Periphery of the last whorl somewhat inflated, feebly 



