532 Mr. H. B. Preston on Mollusca from 



columellar region stained with greyish brown ; whorls 6, very 

 minutely sculptured with indistinct spiral strise ; sutures 

 impressed; columellar perforation extremely narrow; colu- 

 mella descending almost vertically and extending above into 

 a very thin, scarcely perceptible, callus; labrum acute; 

 aperture squarely ovate ; interior of shell showing the curious 

 painting quite as clearly as the exterior. 



Alt. 16, diam. maj. 1075 mm. 



Aperture: alt. 8, diam. 6*25 mm. 



Hob. Shimbi Hills, British East Africa. 



Rachis vichius, sp. n. (Fig. 17.) 



Shell rimate, acutely conical, thin, pale straw-colour, en- 

 circled by three rather narrow bands of reddish purple, apex 

 purplish ; whorls 6, not very convex, very indistinctly and 

 minutely spirally striate; sutures impressed ; columella 

 expanded over the very narrow fissure, descending nearly 

 vertically and diffused into a thin whitish callus which joins 

 the lip above ; aperture very broadly, inversely auriform. 



Alt. 15*75, diam. maj. 9*5, diam. min. 7 mm. 



Aperture : alt. 7, diam. 35 mm. 



Bab. Shimbi Hills, British East Africa. 



Somewhat resembling R. bengalensis, Lk., a common 

 East Indian form, but more conical and narrower in shape. 



Buliminus (?) marguerite, sp. n. (Fig. 18.) 



Shell fusiform, thin, horny, pale brown ; whorls 6, regu- 

 larly increasing, somewhat convex, sculptured with closely 

 set, oblique, transverse costulse, the last whorl bearing a 

 rather indistinct, narrow, semitransparent band at the peri- 

 phery ; sutures impressed and slightly crenellated by the 

 terminations of the transverse costula3 ; umbilicus narrow, 

 partly concealed by the reflection of the columella ; columella 

 descending in a slight curve ; labrum thin, slightly reflexed ; 

 aperture broadly inversely auriform ; interior of shell showing 

 the transverse sculpture through the test. 



Alt. 10, diam. maj. 4 mm. 



Aperture : alt. 3*5, diam. 2 mm. 



Bab. Shimbi Hills, British East Africa. 



Buliminus (?) tribulationis, sp. n. (Fig. 19.) 



Shell differing from B. (?) marguerite in its larger size 

 and somewhat finer sculpture, the whorls, of which there is 



