MOLLUSCA FROM EQUATORIAL AFRICA. 215 



like projections at the angle of the whorls ; the spaces between 

 the costulae are quite smooth and glassy ; the aperture is obliquely 

 elliptical, and the parietal lamella is larger, broader, and more 

 projecting, especially above ; the basal denticle is almost obsolete 

 and the columella is devoid of armature. 



Alt. 4*25, diam. maj. 3 mm. 



Aperture: alt. 1, diam. "5 mm. 



Hob. Mt. ISTyiro, to the south of Lake Rudolph, at an altitude 

 of 8300 feet {A. Blayney PerclvaV). 



Ennea rbniformis, sp. n. (PI. XXXV. fig. 11.) 



Shell perforate, ovately cylindrical, yellowish white ; whorls 6, 

 the first four regularly increasing, the next two increasing in 

 length but not in breadth, the last ascending considerably in 

 front, sculptured with coarse, oblique, transverse plicas which are 

 more noticeable in the subsutural region ; suture imjDressed, 

 coarsely serrated by the terminations of the transverse plic« and 

 considerably overhung in the latter half of the shell by the whorl 

 above ; umbilicus rather wide, deep ; colunaella obliquely de- 

 scending above, sharply curved below, extending into a thick, 

 somewhat well-defined, parietal callus, which reaches the lip 

 above and gives the appearance of a continuous labrum ; labrum 

 white, sinuous, narrowly expanded and reflexed ; aperture reni- 

 forni, bearing a single short, oblique, parietal plait and a denticle 

 on the inner surface of the outer lip in the median part. 



Alt. 6"5, diam. maj. (including the aperture) 4*5 mm. 



Aperture : alt. 2*25, diam. 1 mm. 



Bob. Mt. Elgon, Uganda (C. W. Woodhotise). 



A curious species, easily recognizable by the rather large 

 umbilicus and ascending last whorl, but especially by the kidney- 

 shaped aperture. 



Ennea suavissima, sp. n. (PL XXXY. fig. 13.) 



Shell imperforate, cylindrical, thin, transparent, cream-coloured, 

 polished, shining ; whorls 8, smooth, the first five regularly in- 

 creasing, the sixth increasing in length but little in bi'eadth, the 

 last two flattish, also increasing in length but decreasing in 

 breadth ; suture very lightly impressed, nari-owly margined 

 below ; columella white, rather obliquely descending, somewhat 

 twisted, bearing a plait towards the median region and extending 

 above into a thin, well-defined, parietal callus, which reaches the 

 upper margin of the labrum and bears a short, curved, parietal 

 lamella ; labrum white, thickened, very slightly expanded but not 

 reflexed, bent slightly inwards and thickened towards the middle 

 of the outer margin ; aperture subrhomboidal. 



Alt. 8, diam.* maj. 3'75 mm. 



Aperture: alt. 2-5, diam. 1*25 mm. 



Hab. Mt. Nyiro, to the south of Lake Rudolph, at an altitude 

 of 8300 feet {A. Blayney Percivcd). 



