158 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



Base moderately long, well rounded, and openly, broadly umbilicated, 

 marked by 13 subequal and subequally spaced spiral threads which 

 are wider than the spaces that separate them. In addition to the 

 spiral cords, the base is marked by the continuation of the lines of 

 growth. Inside of umbilicus smooth. Aperture large, subquadrate; 

 outer and basal lips thin, forming a decided angle at their junction; 

 inner lips oblique, smooth, sinuous; parietal wall glazed with a thin 

 callus. 



The type and two specimens of the species, Cat. No. 90108a, 

 U.S.N.M., come from the Cape of Good Hope. The type has three 

 and one-fourth postnuclear whorls, and measures: Altitude, 7 mm.; 

 greater diameter, 8 mm. 



GIBBULA MULTICOLOR Krauss. 



Cat. No. 186874, U.S.N.M., three specimens from Port Alfred 

 (Coll. No. 244). Cat. No. 250508, U.S.N.M., one specimen from Port 

 Alfred (Coll. No. 1381). 



GIBBULA BENZI Krauss. 



Cat. No. 221a, U.S.N.M., two specimens collected by William 

 Stimpson on the North Pacific Exploring Expedition, at False Bay, 

 Cape of Good Hope. Cat. No. 186875, U.S.N.M., four specimens from 

 Port Alfred (Coll. No. 245). Cat. No. 186876a, U.S.N.M., one 

 specimen from the same locality (Coll. No. 246a). 



GIBBULA CAPENSIS Gmelin. 



Cat. No. 98261, U.S.N .M., two specimens from the Cape of Good 

 Hope. Cat. No. 253737, U.S.N.M., one specimen from the same 

 locality. 



GIBBULA AGLAIA, new species. 

 Plate 27, figs. 1, 2, 3. 



Shell depressed, conic, of yellowish white ground color, profusely 

 spotted and dashed with red. A series of large interrupted blotches 

 form a chain on the shoulder while the spiral cords are marked by 

 equally spaced, comma-shaped markings. On the peripheral cord 

 is another series of regularly spaced blotches, while one of the cords 

 of the base is marked at regular intervals with dots of red. Nuclear 

 whorls two, depressed helicoid. Postnuclear whorls well rounded, 

 appressed at the summit, marked between the sutures by three feebly 

 developed spiral cords which appear truncated posteriorly and slope 

 gently anteriorly to the next cord, giving the whorl the effect of 

 being wrapped by three turns of a bandage. The space between the 

 posterior edge of the first band and the summit is a little wider than 

 the other three spaces, which are equal. Suture moderately impressed. 

 Periphery of the last whorl rendered somewhat angular by the spiral 

 cord. Base broadly, openly umbilicated, marked with six spiral 



