28 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



by a thick callus; outer lip very strong, coming to a sharp edge 

 strongly incurved in the middle; columella sinuous and twisted, 

 strong, covered by a thin callus which extends up on the parietal wall. 

 The type, Cat. No. 168, U.S.N.M., was collected by William Stimp- 

 son at Simons Bay on the North Pacific Exploring Expedition. It 

 has five post-nuclear whorls and measures: Length, 6.7 mm.; diame- 

 ter, 3.0 mm. 



MANGILIA EUCOSMIA, new species. 

 Plate 2, fig. 7. 



Shell elongate-conic, slender, white with narrow brown bands. 

 Nuclear whorls 2\, dextral, strongly rounded, smooth, forming an 

 elevated spire. Post-nuclear whorls with a strong shoulder one-third 

 of the distance between the sutures anterior to the summit, the rest 

 well rounded, marked by strong, narrow, sinuous, slightly pro tractive, 

 axial ribs, of which 10 occur upon the first, 12 upon the second and 

 third, 14 upon the fourth and fifth, and 16 upon the penultimate turn. 

 Intercostal spaces about three times as wide as the ribs. The spiral 

 sculpture consists of moderately broad, low, flattened spiral lira- 

 tions, separated by channels a little less in width than the lirations. 

 These lirations grow gradually wider from the summit to the periph- 

 ery. There are 14 of them between the sutures on the penultimate 

 turn. Base attenuated, marked by the continuations of the axial 

 ribs and about 14 spiral lirations, those of the outer half where the 

 ribs are absent being much stronger than the rest. Aperture almost 

 oval, decidedly expanded at the posterior angle, where the outer lip 

 is somewhat reflected by the shallow channel. Middle of the outer 

 lip slightly inbent, thin; columella sinuous and somewhat twisted, 

 covered by a thin callus which extends up on the parietal wall. 



The type has nine whorls and measures: Length, 12.4 mm. ; diame- 

 ter, 4 mm. It and three other specimens, Cat. No. 187004, U.S.N. M., 

 are from Port Alfred (Coll. No. 536). Cat. No. 187005, U.S.N.M., 

 contains two specimens from the same locality (Coll. No. 537). 



In some of the specimens, the spiral lirations show a tendency to 

 split. 



MANGILIA HERILDA, new species. 

 Plate 7, fig. 7. 



Shell small, white. Nucleus consisting of at least one whorl, 

 which appears to be smooth. (In our specimens this is somewhat 

 worn.) Post-nuclear whorls, well rounded, separated by a well im- 

 pressed suture, marked by strong, low, rounded, retractive axial ribs, 

 which are not quite as broad as the spaces that separate them. Of 

 these ribs, about 12 occur upon all the whorls. These ribs disappear 

 shortly after passing over the periphery of the base. In addition 



