148 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



area which extends over the anterior third of the base. The sulci 

 separating the cords on the base are about as wide as the cords. The 

 sulcus immediately anterior to the peripheral cord carries a slender 

 thread equal to the posterior cord on the spire. Aperture sub- 

 circular; outer lip thick within, thinning to the somewhat sinuous 

 edge; inner lip very strongly curved and slightly reflected over the 

 base; parietal wall covered with a thick callus. In addition to the 

 spiral sculpture the base is marked by the continuation of the fine 

 axial threads. 



Young specimens are very broadly umbilicated. In the adult, 

 however, the last whorl bends in and completely covers the um- 

 bilicus. The type and three specimens of this species, Cat. No. 

 186866, U.S.N.M., come from Port Alfred (Coll. No. 236). The 

 type, an adult specimen, having two and one-fourth postnuclear 

 whorls, measures: Altitude, 5.2 mm.; greater diameter, 7.2 mm. 



LEPTOTHYRA QUANTILLA Gould. 



Plate 23, figs. 4, 5, 6. 

 Collonip. quantilla Gould, Proc. Bost. Soc. Nat. Hist., vol. 8, p. 22, 1861. 



Shell small, apex wax yellow, the rest bright red, excepting the 

 umbilical area of the base, which is white. Nuclear whorls well 

 rounded, smooth. Postnuclear whorls marked by strong, rounded, 

 spiral cords which are a little wider than the spaces that separate 

 them; of these cords four occur upon the first and second; five upon 

 the third, and six upon the last turn. The axial sculpture of the spire 

 consists of fine incremental lines only. Sutures channelled. Pe- 

 riphery of the last whorl well rounded. Base short, well rounded, 

 narrowly, openly umbilicated, marked by 15 low, well rounded, spiral 

 cords which are about twice as broad as the spaces that separate them, 

 and fine incremental lines. Aperture very oblique, subcircular; 

 outer lip thin at the edge but very much thickened immediately 

 behind this; columella very thick and strongly curved; parietal wall 

 covered with a thick callus. 



Cat. No. 135, U.S.N.M., Gould's type, was collected by William 

 Stimpson on the North Pacific Exploring Expedition at Simon's Bay, 

 Cape of Good Hope. It has almost three postnuclear whorls and 

 measures: Altitude, 2 mm.; greater diameter, 2.8 mm.; lesser diame- 

 ter, 2.3 mm. Two additional lots from Port Alfred are in the col- 

 lection of the U.S.N.M., Cat. No. 186865a, one specimen (Coll. No. 

 235a) and Cat. No. 249770 (Coll. No. 1042). 



LEPTOTHYRA CARMINEA, new species. 

 Plate 23, figs. 7, 8, 9. 

 Shell small, bright carmine red except the nuclear whorls, which 

 are white. Nuclear whorls two and one-fourth, smooth, separated 



