160 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



GIBBULA PINTADO Gould. 



Plate 28, figs. 10, 11, 12. 

 Margarita pintado Gould, Proc. Bost. Soc. Nat. Hist., vol. 8, p. 16, 1861. 



Shell helicoid, moderately elevated, wax yellow ground color, 

 marked with elongate brown spots on the spiral keels, which are equal 

 to the intervening light areas that separate them in length. Color 

 pattern of base similar to that of the spire. Nuclear whorls one and 

 one-half, well rounded, smooth. Postnuclear whorls strongly 

 rounded, marked by seven well rounded, equally developed and 

 equally spaced, spiral cords on all the turns between the summit and 

 the periphery. Suture feebly impressed. Periphery of the last 

 whorl well rounded. Base moderately long, well rounded and nar- 

 rowly umbilicated, marked by 15 almost equal and equally spaced 

 spiral cords; in the spaces between several of these a fine, spiral line is 

 apparent. Umbilicus without spiral sculpture. The entire surface 

 is marked with very slender, decidedly, retractively, slanting, regu- 

 larly spaced axial threads. Aperture oblique, subquadrate; outer lip 

 thin, rendered wavy on the edge by the external sculpture; columella 

 stout, very oblique, almost straight; parietal wall covered with a thin 

 callus. 



Gould's type, Cat. No. 213, U.S.N.M., was dredged by William 

 Stimpson on North Pacific Exploring Expedition, in 12 fathoms, on 

 sand bottom, in Simons Bay, Cape of Good Hope. It has 3 \ post- 

 nuclear whorls, and measures: Altitude, 4.5 mm.; greater diameter, 

 5.6 mm.; lesser diameter, 5.1 mm. 



GIBBULA ZONATA Wood. 



Cat. No. 123, U.S.N.M., three specimens collected by William 

 Stimpson on the North Pacific Exploring Expedition in Simons Bay, 

 Cape of Good Hope. Cat. No. 18697, U.S.N.M., three specimens from 

 the Cape of Good Hope. Cat. No. 42887, U.S.N.M., six specimens 

 from the same place. Cat. No. 90127, U.S.N.M., seven specimens 

 from the same locality. Cat. No. 250497, U.S.N.M., two young speci- 

 mens from Port Alfred (Coll. No. 1370) . Cat. No. 250528, two young 

 specimens from the same locality (Coll. No. 1401). Cat. No. 272126, 

 U.S.N.M., two from the Cape of Good Hope. 



GIBBULA RIFACA, new species. 

 Plate 32, figs. 4, 5, 6. 



Shell sublenticular, wax colored, with irregular blotchings and spot- 

 tings of very pale chestnut brown; upper surface depressed, helicoid. 

 The nucleus consists of a little more than one whorl, which is well 

 rounded and smooth. Postnuclear turns marked by strongly incised 

 spiral lines, causing the space between them to appear as raised, well 



