238 Bulletin American Museum of Natural History [Vol. LIII 
what darker, the periostracum thin and very glossy. The aperture is 
strongly diagonal, the lip expanded and thickened, deeply sinuated 
‘above and at the base. The inner lip is continuous and thickened. The 
columellar fold emerges; it continues inward into the antepenult whorl 
where it is very weak, the axis being plain above that. 
Length, 10.4 mm.; diameter above aperture, 2.1 mm.; length of aperture, 2.1 
mm.; 12)4 whorls, the apex lost. 
Length, 8.5 mm.; diameter above aperture, 2.0 mm.; length of aperture, 2.0 
mm.; 114 whorls, the apex lost. | 
Probably about one whorl has been lost in the specimens measured. 
Fig. 36 Fig. 37 
Fig. 36. Anceya bella Pilsbry and Bequaert. Type. Tanganyika. 
Fig. 37. Anceya bella Pilsbry and Bequaert. Section of later whorls. 
Anceya bella, new species 
Text Figures 36 and 37 
Lake Tanganyika: without definite locality, numerous specimens; 
Kituta. Type No. 133,783 A. N.S. P. (All L. Stappers Coll.). 
The shell is less slender than A. admirabilis, with more numerous ribs, which are 
usually less distinctly aligned from whorl to whorl, 12 on the penult whorl of the type, 
11 in a paratype; on the last half whorl the ribs become smaller and closer (or some 
times irregular). The basal keel is strongly expressed, somewhat nodulous, but often 
weak or even disappearing on the front of the whorl. Color olive in varying shades. 
Surface glossy. The strongly diagonal aperture is sinuated deeply at both ends, the 
peristome thickened and expanded, as in A. admirabilis, but the columellar lamella is 
represented by a mere trace, hardly noticeable; in a cut specimen none is visible. 
Length, 9.8 mm.; diameter above aperture, 2.6 mm.; length of aperture, 2.6 
mm.; 11}$ whorls, the apex lost. Type. Fig. 36. 
Length, 10.8 mm.; diameter above aperture, 2.6 mm.; length of aperture, 2.7 
mm.; 12}$ whorls, the apex lost. Paratype. 
Length, 9.0 mm.; 9!4 whorls the summit lost. Paratype. 
