SOUTH AFEICAN MARINE MOLLUSKS. 67 



MELANELLA IOTA, new species. 

 Plate 19, fig. 2. 



Shell exceedingly minute, translucent, bluish white, falcate. The 

 whorls are almost flattened, appressed at the summit, separated by a 

 scarcely perceptible suture, and of glassy texture, marked by an 

 occasional inconspicuous varix. Periphery of the last whorl well 

 rounded. Base somewhat attenuated, well rounded. Aperture oval; 

 outer lip thin, clavate; inner lip short, strongly curved and ap- 

 pressed; parietal wall covered by a thick callus. 



The type .and three specimens, Cat. No. 187080, U.S.NM., come 

 from Port Alfred (Coll. No. 621). The type has seven whorls, and 

 measures: Length, 1.5 mm.; diameter, 0.5 mm. 



Cat. No. 250378, U.S.N.M., contains two additional specimens from 

 the same locality (Coll. No. 1251). 



MELANELLA DISTINCTA Smith. 



Cat. No. 187075, U.S.N.M., contains two specimens from Port 

 Alfred (Coll. No. 616). 



MELANELLA LANGLEYI Sowerby. 



Cat. No. 186856, U.S.N.M., six specimens from Port Alfred (Coll. 

 No. 226). 



MELANELLA FARICA, new species. 

 Plate 20, fig. 1. 



Shell small, very irregularly elongate-conic, semitranslucent, bluish 

 white. Postnuclear whorls well rounded, creeping up on the preced- 

 ing turns and giving the outline at the summit a somewhat excurved 

 aspect, the extreme summit being very feebly shouldered. This, 

 taken together with the fact that the posterior limit of the inside 

 of the whorls shines through the substance of the shell, gives the 

 whorls the appearance of having a spiral cord at the summit. The 

 whorls are very high between the sutures, and are smooth and pol- 

 ished, bearing varices at intervals of slightly more than one-half a 

 turn, thus forming almost two lines of varices on the two sides of the 

 shell. Sutures strongly marked. Periphery of the last whorl well 

 rounded. Base attenuated. Aperture oval; posterior angle acute; 

 outer lip produced into a claw-like element in its middle; inner lip 

 almost straight, oblique, reflected over and adnate to the body 

 whorl; parietal wall covered with a thick callus, which renders the 

 peritreme complete. 



The type and another specimen, Cat. No. 249711, U.S.N.M., come 

 from Port Alfred (Coll. No. 983). The type has seven whorls, and 

 measures: Length, 3 mm.; diameter, 0.8 mm. 



Cat. No. 250379, U.S.N.M., contains another specimen of this 

 species from the same locality (Coll. No. 1252). 



