1038 NODULARIA 
hinge line nearly straight; anterior end rounded but consider- 
ably cut away below; base line almost straight and subparallel 
with the hinge line to behind the middle, where it is inflated ; 
dorsal slope decidedly and obliquely truncate ; pseudocardinals 
compressed, strong; nacre bluish, reddish in the cavities. 
Length 33, height 17, diam. Io mm. 
Lake Nyassa. 
Unio liederi voN Marrens, Besch. Deuts. Ost-Af., 1897, p. 
226, pl. vii, fig. 19. 
Nodularia liederi SIMPSON, Syn., 1900, p. 824. 
A rather elongated species, which does not seem to have 
any very striking characters, yet it does not appear to be refer- 
able to any other species. 
Species INCERTA SEDIS 
NoOpDULARIA DUPONTI (Rochebrune). 
Reneus duponti JoussEAUME, Bull. Soc. Zool. Fr., XL, 1881, 
p. 481. 
Unio duponti RocHEBRUNE, Bull. Soc. Philom., VI, 1882, p. 
34; Bull. Mus. Hist. Nat., 1904, p. 258.—GrERMAIN, Bull. 
Mus. Hist. Nat., 1906, p. 304. 
Parreysia duponti (part) Stmpson, Syn., 1900, p. 846. 
Type locality, Backoy River, Senegal. 
In the Synopsis this species was united with the U. duponti 
of Bourguignat. But both Rochebrune and Germain (1. c.), 
consider it distinct. 
The original description is not now accessible to me. 
NopvutARIA CHIvotTrt Germain. 
“Shell small, quite regularly oval, much compressed ; valves 
thin, but quite solid, slightly gaping anteriorly ; dorsal margin 
regularly subconvex; ventral margin very regularly and de- 
cidedly convex; anterior end rounded, slightly sloping to- 
wards the base; hinder end one and one-half times longer than 
the anterior, ending in a slightly truncated point ; beaks eroded. 
not very prominent, rather large and obtuse ; dorsal edge not 
very acute; in the right valve, two medium-sized cardinal 
teeth, the lower more elevated than the upper, almost smooth, 
slightly crenulated at the anterior extremity, the upper a little 
