534 Mr. H. B. Preston on Mollusca from 



Curvella mathildce, sp. n. (Fig. 22.) 



Shell fusiform, thin, transparent, yellowish white, with 

 blunt apex ; whorls 5^, sculptured with rather fine, arcuate, 

 transverse growth striae ; sutures impressed, narrowly mar- 

 gined below ; columella white, narrowly reflexed, descending 

 vertically ; labrum simple ; aperture elongately, inversely 

 auriform; interior of shell having a white streak at the 

 base. 



Alt. 11*5, diam. maj. nearly 5 mm. 



Aperture : alt. 5, diam. 2 mm. 



Hab. Usagara, German East Africa. 



Curvella per tr an slucens, sp. n. (Fig. 23.) 



Shell fusiform, thin, transparent, whitish, horny, polished ; 

 whorls 6, sculptured with somewhat distant, transverse, 

 arcuate growth striae ; sutures impressed, very narrowly 

 margined below ; perforation almost concealed by the re- 

 flexion of the columella; columella very slightly bulging in 

 the middle, descending almost vertically ; labrum acute, 

 receding above and below; aperture inversely auriform. 



Alt. 11, diam. maj. 4*25 mm. 



Aperture: alt. 4'25, diam. 1*75 mm. 



Hab. Shimbi Hills, British East Africa. 



Curvella shimbiense, sp. n. (Fig. 24.) 



Shell darker in colour, having one whorl more, and much 

 more slender than C. pertransluctns, the whorls are rather 

 flatter and the aperture shorter and narrower than in that 

 species. 



Alt. 10*5, diam. maj. 3 # 5 mm. 



Aperture: alt. 3, diam. 1 mm. 



Bab. Shimbi Hills, British East Africa. 



Homorus ordinarius, sp. n. (Fig. 25.) 



Shell elongately subulate, transparent brown, polished, 

 shining, with mam miliary apical whorls ; whorls 11^, rather 

 flattened, somewhat puckered at the sutures, otherwise smooth, 

 but for lines of growth ; sutures impressed, narrowly mar- 

 gined below; columella whitish, widely excavated above, 

 descending in an oblique curve and diffused into a thin callus 

 which joins the lip above; labrum simple ; aperture ovate. 



Alt. 18*5, diam. maj. 3"75 mm. 



Aperture: alt. 3, diam. 1*75 mm. 



Hab. Shimbi Hills, British East Africa. 



