SOUTH AFRICAN" MAEINE MOLLTJSKS. 71 



The type and another specimen, Cat. No. 249719, U.S.N.M., come 

 from Port Alfred (Coll. No. 991). The type has nine postnuclear 

 whorls remaining, the nucleus, and probably the first two of the 

 succeeding turns, having been lost. It measures: Length, 11 mm.; 

 diameter, 4.3 mm. 



Another specimen from the same locality is entered' as Cat. No. 

 186861, U.S.N.M. (Coll. No. 231). 



Family PYRAMIDELLIDAE. 



Genus PYRAMIDELLA Lamarck. 



PYRAMIDELLA (ORINELLA) AFRICANA, new species. 



Plate 14, figs. 2, 4. 



Shell elongate-conic, light brown. Nuclear whorls two, small, 

 planorboid, having their axis at right angles to that of the succeeding 

 turns, in the first of which they are very slightly immersed. Post- 

 nuclear whorls almost flat, feebly shouldered at the summit, marked 

 by very fine incremental hues, and exceedingly fine spiral striatums. 

 Suture moderately constricted. Periphery of the last whorl well 

 rounded. Base short, well rounded, narrowly umbilicated, marked 

 like the spire. Aperture subquadrate; posterior angle acute; outer 

 lip thin; inner Up almost vertical, strongly reflected, provided with a 

 fold a little anterior to its insertion. 



Cat. No. 186841a, U.S.N.M. contains three specimens from Port 

 Alfred (Coll. No. 208). Two of these are young individuals having 

 the nucleus, and one an adult shell, which has lost the nuclear whorls, 

 and probably the first four succeeding turns. The adult specimen, 

 the type, has seven whorls remaining, and measures: Length, 6.1 

 mm.; diameter, 1.8 mm. One of the young specimens has eight 

 postnuclear whorls, and measures : Length, 3 . 7 mm. ; diameter, 1 .2 mm. 



PYRAMIDELLA (ORINELLA) ALFREDENSIS, new species. 

 Plate 14, figs. 5, 7. 



Shell elongate-conic, milk white. Nuclear whorls very small, one 

 and three-fourths, planorboid, having their axis at right angles to 

 that of succeeding turns. The left side of the nucleus projects con- 

 siderably beyond the outline of the postnuclear spire. Postnuclear 

 whorls almost flat; feebly shouldered at the summit, marked by ex- 

 ceedingly fine, retractive, incremental lines, and numerous micro- 

 scopic spiral striations. Suture moderately constricted. Periphery 

 of the last whorl well rounded. Base well rounded, decidedly um- 

 bilicated, marked like the spire. Aperture subquadrate; posterior 

 angle acute; outer lip thin; inner Up very oblique, and decidedly 

 reflected, provided with a strong fold near its insertion; parietal wall 

 glazed with a thin callus. 



