70 STREPTAX1S. 



S. ALBIDUS, Pfeiffer. PI. 14, figs. 79-81. 



Subperforate, smooth, white ; whorls 5 ; aperture edentulous, 

 the lip simple, somewhat reflected at the columella. 



Diam., 8 mill. 



Guinea (Patel). 

 S. CANDEANUS, Petit. PI. 14, figs. 89-91. 



Shell white, shining, perforate ; whorls 5-6 ; aperture edentu- 

 lous, the lip narrowly reflected. Diam., 4 mill. 



New Granada. 



Dr. Pfeiffer at one time confounded this with S. deformis, 

 Fer., and although the latter is larger, and the parietal wall is 

 furnished with a small tooth, I think it very probable that they 

 are merely forms of one species. 



S. GIBBONSI, Taylor. PI. 14, figs. 82, 83. 



Shell thin, shining, semitransparent, opalescent, smooth; 

 whorls 5^, suture profound, with short prominent plicae ; lip 

 thickened and a little everted, the extremities connected by a 

 slight callus ; umbilicus small, shallow, partly concealed by the 

 inner lip. L. 7, diam. 4*5 mill. 



Zanzibar. 



Said to be most nearly allied to the unfigured S. Kirki, 

 Dohrn. It is the type of Mr. Taylor's genus Gonaxis (see 

 p. 57). 



S. ENNEOIDES, Martens. PL 16, fig. 5. 



Shell perforate, arcuately costulate, yellowish white, some- 

 what shining ; whorls 6, with denticulated suture, the last one 

 with flattened and smooth base ; lip white, arcuate above, some- 

 what expanded. Diam. 9, alt. 13'5 mill. 



Ukamba, W. Africa. 



Martens says that this is very close to 8. Welwitschi, 

 Morelet, but that species is smooth except at the sutures. 



S. MOZAMBICENSIS, E. A. Smith. PI. 14, figs. 87, 88. 



Shell linearly rimate, whitish, smooth, glossy ; whorls 6, 

 crenulated beneath the deep suture ; outer lip narrowly 

 expanded. Diam. 4*5, alt. 7 '5 mill. 



Between Lake Nyassa and the East Coast of Africa. 



This species is smaller and less distorted than S. Kirkii, 

 Dohrn, and has merely a linear umbilical fissure. It is likewise 



