56 CURVELLA, EAST AFRICA. 



ish. Whorls 7, regularly increasing, pretty flat, only a little 

 convex below the suture, the last whorl rounded beneath, de- 

 scending to the aperture. Aperture scarcely oblique, much 

 less than half as long as the shell, pirif orm, with unexpanded, 

 simple margins. Outer lip weakly arched above, more so 

 below ; basal margin narrowly rounded ; columellar margin 

 thickened, triangularly expanded and reflexed, not covering 

 the umbilicus. Length 12, diam. 5 mm., aperture 5 mm. long, 

 3 wide (Martens) . 



British East Africa, Dschala Lake, southeast of Kilima- 

 Njaro (Dr. Kretschrner). 



Ha pal us krcisclnneri MARTENS, Beschalte "Weichthiere D. 

 O.-Af., p. 129, pi. 5, f. 22. 



"Midway between H. disparilis and H. delicatus, being 

 narrower than the former, fuller and wider than the latter." 



16. C. CONOIDEA (Martens). PL 8, fig. 18. 



Shell conic-ovate with circular umbilical opening and im- 

 pressed arcuate lines, which distinctly bend back near the 

 suture; somewhat glossy, yellowish- white. Six regularly in- 

 creasing whorls with moderately deep suture, the last whorl 

 rounded beneath, not conspicuously deflexed in front. Aper- 

 ture vertical, pirif orm; peristome simple, the outer margin 

 forwardly convex, basal margin rounded, columellar margin 

 somewhat dilated and expanded outwardly. Length 10, diam. 

 5.5, aperture 4.5x2.5 mm. (Marts.). 



East Africa: Migere in Butumbi, on the south shore of 

 the Ngesi, in leaf -mould of the forest (Stuhlmann). 



Hapalus conoideus MARTS., Sitz.-Ber. d. Ges. nat. Freunde, 

 1892, 177; Beschalte Weichthiere D. O.-Af r., p. 129, pi. 5, 

 f. 14. 



Differs from the other species 'by its open umbilicus and the 

 rather dilated columellar margin, but it shows the character- 

 istic arcuate striation of the genus. 



17. C. NYASANA Smith. PI. 9, fig. 50. 



Shell elongate, ovate-conoid, whitish, subpellucid, narrowly 

 umbilicate, sculptured with strongly curved, riblet-like 



