— 22 1 



Curvella alabastrina sp. n. — PI. XI, fig. 9. 



Shell fusiform with obtuse apex, rather thin, shining, white; whorls 5 1/2, 

 slightl}' shouldered above, sculptured with coarse, transverse, arcuate strise; 

 suture well inrpressed; perforation extremel)^ narrow; columella almost 

 verticallj' descending; labrum sinuous, receding below and slightl}' above; 

 aperture inversai)- auriform. 



Alt. 7.75, diam. maj. (nearly) .3 mm. 



Aperture : ait. 2.75, diam. i mm. 



Hab. — Naivasha, British East Africa. 



15 



