1927] _  Pusbry-Bequaert, The Aquatic Mollusks of the Belgian Congo 413 
Moncetia has the distally truncate hinge-plate of Aspatharia. The 
muscle impressions are imperfectly shown in the figure, and were not 
mentioned in Bourguignat’s observations. The strong lateral :compres- 
sion appears to be slight ground for distinction from Aspatharia, and the 
subgenus may prove superfluous. From the menses given, there seems 
to be only one species. : 
Brazzxa of Bourguignat is ap wattle a more dintined group, its 
rank to. be governed by considerations of the soft anatomy It has the 
deep sinulus of Aspatharia, terminating the hinge-line abruptly. The 
thin dorsal margin of the right valve projects a little above the left in 
front of the beaks, whilst in the rubens group of Aspatharia the left is 
slightly higher. Von Martens’ remark! that the relations of the valves 
are as in Corbula goes far beyond Bourguignat’s explicit statement. 
There is probably only one species of the subgenus Brazzea, character- 
ized by the strongly inflated, thin and lustrous shell. 
Chambardia BoureuIeNnat (1890, Bull. Soc. Malacol. France, VII, 
p. 304; type by present designation: Chambardia letourneuxi Bourguig- 
nat, ihe first species) is unknown to us by specimens. Possibly it also 
belongs i in Aspatharia. Five species have been described: C. ee es 
“‘Letourneux”’ BourauienaT (1890, op. cit., p. 318, Pl. vu, fig. 6); C 
letourneuxt BourcuienaT (1890, op. cit., p. 307, Pl. vu, figs. 1-2); 
C. locardiana Bourcutenat (1890, op. cit., p. 310); C. pharaonum Bour- 
GUIGNAT (1890, op. cit., p. 312); and C. rhynchoidea BouRGUIGNAT 
(1890, op. cit., p. 309, Pl. vu, figs. 3-5). All were found subfossil in 
Lower Egypt. | 3 bss 
: ; 3 Subgenus ASPATHARIA, proper 
The following species appear to belong in this group. 
Aspatharia chapini Pilsbry and Bequaert. See p. 416. 
Aspatharia corrugata (Dautzenberg) =Spatha corrugata DAvrzENBERG, 1893, 
Journ. de.Conchyl., XLI, p. 50, Pl. viii, fig. 5. Simpson, 1914, ‘Descript. Cat. of 
Naiades,’ p. 1348. - Niari Rives French Caace, 
Aspatharia dahomeyensis (I. Lea) = Anodonta ra toppaniatess 1 Lma, 1859, Proc. 
Ac. Nat. Sci. Philadelphia, XI, p. 154; 1860, ‘Observ. Unio,’ VII, p. 79, Pl. xur, 
fig. 141. . Anodonta senegalensis I. Lua, 1859, Proc. Ac. Nat. Sci. Philadelphia, XI, 
p. 154; 1860, ‘Observ. Unio,’ VII, p. 78, Pl. x1, fig. 140. Mutelina senegalica. 
JoussEAUME, 1886, Bull. Soc. Zool. France, XI, p. 488. Spatha dahomeyensis Stmp- 
son, 1914, ‘Descript. Cat. of Naiades,’ p. 1341. Dahomey and Senegal. 
Aspatharia decorset (Germain) =Spatha (Leptospatha) decorsei GERMarIn, 1904, 
Bull. Mus. Hist. Nat. Paris, p. 469; 1908, in A. Chevalier, ‘L’ Afrique Centrale 
Frangaise,’ p. 557, Lith. Pl., fig. 5. Simpson, 1914, ‘Descript. Cat. of Naiades,’ p 
1339. Mamun, Senussi Country, French Equatorial Africa. 
1E£, von Martens, 1897, ‘Deutsch Ost Afr., IV, Beschalte Weichth.,’ p. 258. 
