SOUTH AFRICAN MARINE MOLLUSKS. 37 



MARGINELLA EUCOSMIA, new species. 

 Plate 1, fig. 11. 



Shell of medium size, marbled, excepting a broad whitish band 

 which extends over almost half the space between the shoulder and 

 the base. Whorls appressed at the summit, forming a very slightly 

 curved spire. Body of the last whorl very slightly convex. Outer 

 lip very much thickened at the edge, shouldered at the summit, 

 very slightly contracted in the middle, white or faintly spirally 

 streaked in front, decidedly so behind; columella provided with a 

 strong callus and four folds, the anterior two of which are much 

 more oblique than the rest; the first one is the weakest, and forms 

 the basal margin of the columella. 



The type, Cat. No. 186986, U.S.N.M., comes from Port Alfred 

 (Coll. No. 518); it has 4| whorls and measures: Length, 12.5 mm.; 

 diameter, 6 mm. 



Two additional lots, from Port Alfred, are in the collection of the 

 United States National Museum. One, Cat. No. 186987, U.S.N.M., 

 four specimens (Coll. No. 519), and Cat. No. 186985, U.S.N .M., three 

 specimens (Coll. No. 517). 



MARGINELLA, species? 



Cat. No. 186986a, U.S.N.M., contains a specimen about the size 

 of M. eucosmia, but a little stouter, with fine brown spiral lines upon 

 a white background. The specimen is too worn to permit of proper 

 diagnosis. It comes from Port Alfred (Coll. No. 518). 



MARGINELLA COSMIA, new species. 

 Plate 21, fig. 2. 



Shell of medium size, polished, marked only by fine lines of 

 growth. Spire moderately elevated; whorls slightly angulated at the 

 periphery. Summits of succeeding turns creeping up on the preced- 

 ing whorl, to which they are appressed. Nuclear whorls light 

 yellow, succeeding turns flesh color, marked with many irregular, 

 wavy, axial bands of brown, which are preceded by a shadow of a 

 much lighter tint. Aperture wide; posterior angle very obtuse; 

 outer lip very much thickened, clouded with many oval spots of 

 ashy gray, the long axis of which is spirally disposed; columella 

 smoky white, provided with four almost equally strong oblique 

 folds; parietal wall covered by a moderately thick callus. 



The type and two specimens, Cat. No. 249668, U.S.N.M., come 

 from Port Alfred (Coll. No. 940). The type measures: Length, 11.7 

 mm.; diameter, 6.8 mm. Cat. No. 186988, U.S.N.M., contains two 

 more from the same locality (Coll. No. 520). 

 80737°— Bull. 91—15 4 



