66 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



the suture is scarcely apparent, while the posterior limit of the body 

 cavity shining through the substance of the shell assumes the appear- 

 ance of a suture. The whorls are marked at irregular intervals by 

 slightly impressed axial lines marking varices. Periphery of the last 

 whorl well rounded. Base produced. Aperture oval; posterior 

 angle very acute; outer lip thin at the edge, produced into a clawlike 

 element midway between the base and the posterior angle; inner lip 

 thick, slightly curved, reflected over and adnate to the body whorl; 

 parietal wall covered by a thin callus. 



The type, Cat. No. 250384, U.S.N.M., comes from Port Alfred 

 (Coll. No. 1257). It has 10 whorls, and measures: Length, 4.1 mm.; 

 diameter, 1.2 mm. 



A young specimen from the same locality is entered as Cat. No. 

 250383, U.S.N.M (Coll. No. 1256). 



MELANELLA ICAFRA, new species. 

 Plate 20, fig. 3. 



Shell very small, stout, decidedly twisted, semitranslucent. Nuclear 

 whorls well rounded. Postnuclear turns appressed at the summit, 

 well rounded, polished, marked by an occasional varix. The posterior 

 limit of the inside of the whorls shining through the substance of the 

 shell appears as a false suture. Sutures scarcely visible. Periphery 

 of the last whorl slightly angulated, inflated. Base prolonged, in- 

 flated, and well rounded. Aperture rather large; posterior angle 

 acute; outer lip drawn forward in the middle into a claw-like element; 

 inner lip thin, reflected over and adnate to the body whorl; parietal 

 wall glazed by a thin callus. 



The type and another specimen, Cat. No. 250380, U.S.N.M., come 

 from Port Alfred (Coll. No. 1253). The type has seven whorls, 

 and measures: Length, 2.2 mm.; diameter, 1 mm. 



MELANELLA ALFREDENSIS, new species. 



Plate 19, fig. 5. 



Shell small, elongate-conic, slightly falcate, almost transparent, 

 bluish white. The whorls are slightly rounded, appressed at the 

 summit, through which the preceding whorl shines, giving the shell 

 the aspect of having a double suture. Suture feebly impressed. 

 Periphery well rounded. Base attenuated, well rounded; entire 

 surface polished and marked by exceedingly fine, incremental lines 

 and an occasional, irregularly disposed varix. Aperture ovate; outer 

 lip somewhat clavate; inner lip appressed; gently curved; parietal 

 wall glazed with a thin callus. 



The type, Cat. No. 187076, U.S.N.M., comes from Port Alfred 

 (Coll. No. 617). It has eight postnuclear whorls, and measures: 

 Length, 4 mm.; diameter, 1.2 mm. 



