210 Bulletin American Museum of Natural H istory 2 AN ol. LATE 
Vivipara brincatiana var. bridouxiana Bourguignat. E. v. Martens, 1897, 
‘Deutsch Ost Afr., IV, Beschalte Weichth., p. 183. Kopetrt, 1907, in Martini and 
Chemnitz, ‘Syst. Conch. Cab., N.F., II, 21a, Paludina,’ p. 171, Pl. xxxu111, fig. 12. 
Type locality: eastern shore of Lake Tanganyika near the mouth of the Mala- 
garazi River. . 
NeotHauma i. A. Smith 
Neothauma E. A. Smiru, 1880, Proc. Zool. Soc. London, p. 349. Monotype: 
. Neothauma tanganyicense E. A. Smith. 
According to Moore (1901, Proc. Zool. Soc. London, IJ, p. 466), 
the anatomical structure of Neothauma is similar to that of Viviparus, 
but the nervous system is less concentrated. 
The genus is restricted to Lake Tanganyika. 
Germain (1908, Rés. Scientif. Voy. Afrique Foa,’ pp. 658-662) 
admits three species of this genus, which he believes are distributed in 
different regions of Lake Tanganyika. This opinion is evidently based 
upon Moore’s contentions, but it is hardly borne out by the extensive 
collections made by Stappers in 1912-13, now at the Congo Museum, 
Tervueren. From a study of this material Dautzenberg concludes that 
there is only one very variable species af Neothauma, a point of view 
also advocated by E. A. Smith in 1904. The typical form and the 
varieties bicarinatum and euryomphalum have, for instance, all been 
dredged off Moliro, at the southern end of the Lake. 
Charles Hedley (1925, The Nautilus, XXXVIII, p. 110) found 
Neothauma abundant on the strand at Albertville. Forms represented 
are similar to Bourguiguat’s figures of tanganikanum, bicarinatum (both 
short and elongate), bridouxianum, either with narrow perforation or 
similarly shaped but with an umbilicus like euryomphalum; also ‘various 
annectant examples. The color under the periostracum may be either 
white or purplish. 
Neothauma tanganyicense K. A. Smith 
Plate XIX, Figures 2, 3, 5 
Neothauma tanganyicense HE. A. Situ, 1880, Proc. Zool. Soc. London, p. 349, Pl. 
XXXI, figs. 7-7c, 1881, op. cit., p. 293; 1889, Ann. Mag. Nat. Hist., (6) IV, p. 173. 
Crossk, 1881, Journ. de Conchyl., XXTX, p. 112. E. v. Marrens, 1883, Sitz. Ber. 
Ges. Naturf. Fr. Berlin, pp. 71 and 72. G. B. Sowrrsy, 1894, ‘List of Shells of Lake 
Tanganyika,’ p. 1, Pl., fig.2. E.v. Marrens, 1897, ‘Deutsch Ost Afr., IV, Beschalte 
Weichth.,’ p. 203. J. E.S. Moors, 1901, Proc. Zool. Soc. London, II, p. 466 (anatomy), 
Pl. xxv, figs. 1, 2, and 4 and Pl. xxv, figs. 1, 3, and 4-6; 1903, ‘The Tanganyika 
Problem,’ p. 264, figs. 44-46. E. A. Smrru, 1904, Proc. Malacol. Soc. London, VI, 
2, p. 99; 1906, Proc. Zool. Soc. London, I, p. 184. Kosertt, 1907, in Martini and 
Chemnitz, ‘Syst. Conch. Cab., N.F., II, 21a, Paludina,’ p. 154, Pl. XXXI, figs. 1-6 
