232 © Bulletin American Museum of Natural History [Vol. LIII 
— Syrnolopsis minuta var. semilevis ANCEY, 1907, Bull. Scientif. France et Belgi- 
que, (5) IX, (1906), p. 267. : 
Syrnolopsis minuta var. multicarinata ANcEY, 1907, op. cit., p. 267. 
Syrnolopsis minuta var. unicarinata ANCEY, 1907, op. cit., p. 267. 
Lake Tanganyika; Pambete (type locality of both Seeuils and minuta); Ufipa 
(Lechaptois Coll.). . 
Lake Tanganika: several lots palleoted by L. Stappers; Tembwe 
(Hubert Coll.); Albertville, on the sandy beach (Charles Hedley Coll.). 
The shape is somewhat pupiform, the lateral outlines being decidedly — 
more convex in the upper half than in S. lacustris, the last two whorls 
cylindric. Typically the whorls are smooth except for very fine axial 
striz, clearly engraved in unworn shells, and sometimes a few minute 
spiral lines; but, in most examples seen, after the two strongly convex, 
smooth, embryonic whorls there are two angles or carinz on each whorl, 
near the sutures. These may continue to the last whorl, but more fre- 
quently they disappear with growth. The outer lip is expanded a little 
and slightly sinuous in profile. The base is retracted and effuse. The 
calloused and continuous columellar and parietal border is raised as a 
distinct ledge, often with a groove between it and the whorl. The 
columellar fold is strong and emerges nearly to the edge. Two deeply 
immersed palatal folds are lateral and ventral in position. 
Length, 5.80 mm.; ; diameter, 2.0mm.; 84 whorls. (Fig. 28f). 
eee Sw Be 875 a (Fig. 28e). 
oe 5.40 66 be 1.9 (a gly * (a4 
ee OO a By, 
ni ee eae a Lote hci ge WEROFIS: 
(a9 4.50 6¢ (a9 L.A ce 8 (a9 
Variation in the carine is shown in the figures. As scarcely two 
specimens are alike, these variations do not denote races. There is also 
great variation in size and in ratio of diameter to length, as in the speci- 
mens drawn in Fig. 28e, f. 
Germain believes S. giraud: Bourguignat to be a ‘‘var. major” of 
S. minuta; but in about a hundred specimens of the latter before us, 
none reaches the size of giraudi (7.5 X3.0 mm., according to Bourguignat), 
and we are disposed to think them distinct. According to Bourguignat’s 
figure, the contour is somewhat convex, as in S. minuta, but in size, 
especially in diameter, it agrees better with S. lacustris. 
Syrnolopsis minuta carinifera EK. A. Smith 
Text Figures 29a-c and 30a-b 
Syrnolopsis carinifera EH. A. Smrru, 1889, Ann. Mag. Nat. Hist., (6) IV, p. 174. 
G. B. Sowrrsy, 1894, ‘List of Shells of Lake Tanganyika,’ p. 2, PL., fig. 15. E. v. 
Martens, 1897, ‘Deutsch Ost Afr., IV, Beschalte Weichth.,’ p. 210. E. A. Smrru, 
