1927]. Pilsbry-Bequaert, The Aquatic Mollusks of the Belgian Congo 233 
1904, Proc. Malacol. Soc. London, VI, 2, p. 97, fig. 6 (on p. 87). GERMAIN, 1919, Bull. 
Mus. Hist. Nat. Paris, p. 355, figs. 34 and 35 (on p. 356). | 
Syrnolopsis minuta var. carinifera E. A. Smith. ANcEY, 1907, Bull. Scientif. 
France et Belgique, (5) IX, (1906), pp. 255 and 267. 
Lake Tanganyika: described from the lake, without more definite locality (C. 
' Hore Coll.); Kigoma; Ufipa (Lechaptois Coll.). 
Fig. 30. a-b, Syrnolopsis minuta carinifera IX. A. Smith, sections. 
Lake Tanganyika: several lots collected by L. Stappers. 
This is a Pyrgula-like form, with noticeably convex lateral outlines, 
the first two (or sometimes three) whorls smooth and strongly convex, 
the rest bicarinate, one keel below the suture, another above it, a small, 
low thread often visible immediately above the suture. There is a flat, 
axially striate space in the middle of each whorl. The last whorl has two 
carine at the periphery, the upper one more prominent. The ovate 
