1927] Pilsbry-Bequaert, The Aquatic Mollusks of the Belgian Congo 229 
Syrnolopsis anceyana BouRGUIGNAT, 1885, ‘Notice Prodrom. Moll. Giraud 
Tanganika,’ p. 20; 1888, ‘Iconogr. Malacol. Tanganika,’ PI. X, figs. 25-27; 1890, 
Ann. Se. Nat. Zick, (7). X, p. 145, Pl. x, figs. 25-27. Ancry, 1907, Bull. eetentit 
France et Belgique, (5) TX; (1906); 0: 250" 
Syrnolopsis hamyana Boureuienat, 1885, ‘Notice Prodrom. Moll. Giraud Tan- 
ganika,’ p. 17; 1888, ‘Iconogr. Malacol. Tanganika,’ Pl. x, figs. 18-21; 1890, Ann. 
Sc. Nat. Zool., (7) X, p. 142, Pl. x, figs. 18-21. Ancry, 1907, Bull. Scientif. France et 
Belgique, (5) IX, (1906), p. 255. | 
Syrnolopsis foai J. MaBiLie, 1901, Bull. Soc. Philomath. Paris, (9) III, 2, p. 56. 
GERMAIN, 1905, Bull. Mus. Hist. Nat. Paris, p. 260; 1908, ‘Rés. Scientif. Voy. 
Afrique Foa,’ p. 676, fig. 26 (young of S. lacustris). 
Lake Tanganyika: originally described from the lake without more definite 
locality (J. Thomson Coll.); Pambete (type locality of grandidieriana, anceyana, and 
hamyana); Ufipa. 
Fig. 26. Syrnolopsis lacustris E.. A. Smith:' a, one of the original lot; og 
Sumbu Bay. h, 8. lacustris molirensis Pilsbry and Bequaert. 
Sumbu Bay (Stappers Coll.); Albertville (Charles Hedley Coll.). 
The original specimens had the outer lip slightly thickened, widely 
sinuated above and below a prominent outer basal lobe, the “columella 
thickened, with a distinct plait. at the upper part, and joined to 
the upper extremity of the labium by a thin callosity.” Strong up- 
per and weak lower palatal folds are so deeply immersed that they are 
not visible except by transparence or by breaking back the outer lip. 
Length, 11.5 mm.; diameter, 3 mm.; length of aperture, 3 mm. One of 
the original lot is represented in Figs. 26a and 27b. The lateral outlines 
of the spire are slightly convex, the individual whorls almost flat, the 
earliest convex. ‘This specimen measures: length, 10.5 mm.; diameter, 
