24 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



with the growth of the whorls. Post-nuclear whorls very strongly 

 shouldered at about one third of the distance between the sutures 

 anterior to the summit, marked by strong, somewhat protractive axial 

 ribs, of which 12 occur upon all but the penultimate turn; upon this 

 there are 14. Intercostal spaces about three times as wide as the 

 ribs. In addition to the axial sculpture the whorls are marked by 

 spiral lirations which are of two strengths. Four of the stronger cross 

 the whorls between the periphery and the shoulder; of these one is 

 immediately above the suture and one at the angle of the shoulder, 

 the other two divide the space between them into three unequal 

 areas. The space between the peripheral and second strong liration 

 is crossed by four slender subequal spiral threads; that between the 

 second and third also by four, that between the thud and fourth by 

 five, of which the middle one is a little stronger than the rest. The 

 space between the shoulder and the summit of the whorls is marked 

 by about 20 slender, equal and equally spaced, spiral threads. Sutures 

 strongly marked. Periphery of the last whorl well rounded. Base 

 attenuated, marked by strong and fine lirations like the spire, those 

 on the columellar portion being stronger than the rest. There are 

 twelve strong threads having a somewhat variable number of finer 

 threads between them. The entire surface of spire and base is also 

 marked by fine lines of growth which give a pitted appearance to the 

 spaces between the fine spiral fines in the intercostal spaces. All 

 the spirals cross the axial ribs and the coarser ones render their junc- 

 tions with the ribs slightly nodulose. Aperture of irregular shape; 

 outer lip scythe-shaped, the border of the deep-rounded notch which is 

 immediately below the summit representing the handle, the flattened 

 surface of the strongly in-bent outer lip forming the blade; the sur- 

 face of the latter is finely, spirally striated; columellar wall covered 

 by a thin callus which extends upon the parietal wall. 



The type, Cat. No. 186686a, U.S.N.M., comes from Port Alfred 

 (Coll. No. 42). It has seven whorls, and measures: Length, 6.0 mm.; 

 diameter, 2.4 mm. 



MANGILIA VERRUCOSA Sowerby. 



Cat. No. 227758,U.S.N.M., two specimens from Port Alfred (Coll. 



No. 853). 



MANGILIA GISNA, new species. 

 Plate 7, fig. 3. 



Shell small, golden brown. Nuclear whorls one and a half, smooth, 

 forming a rather elevated apex. Post-nuclear whorls, well rounded, 

 shouldered at the summit, marked by strong spiral cords, of which 3 

 occur upon the first two whorls between the sutures, and 4 upon the 

 penultimate. The base of the last whorl is marked by eight addi- 



