1036 NODULARTA 
posterior part of the shell widely rounded; surface with mod- 
erate growth lines; epidermis yellowish-brown, the umbones 
white, marked with orange-red; nacre whitish, tinted reddish. 
Length 43, height 25, diam. 20 mm. 
Victoria Nyanza. 
Unio emint VON Martens, Besch. Deuts. Ost-Af., 1897, p. 224, 
pl. vu, fig. 14. 
Nodularia enuini Simpson, Syn., 1900, p. 823. 
The distinguishing characters of this species seem to be its 
rather short, rhomboid form and the somewhat sinuous hinge 
plate. The color of the beaks and umbonal region is peculiar. 
NepvulLARTA BOHMI (von Martens). 
Shell rather large for a member of the group, long, rhom- 
boid, somewhat inflated and solid, quite inequilateral; beaks 
large, high and full; posterior ridge only moderately devel- 
oped, rounded, inclined to be double below, ending in a feeble 
biangulation near the base of the shell; hinge line strongly 
curved; anterior end rounded, lightly angled above; base line 
faintly curved; dorsal slope obliquely subtruncate; surface 
with delicate, concentric sculpture, brownish; pseudocardinals | 
quite strong, subcompressed, ragged; laterals decidedly curv- 
ed, lamellar; anterior muscle scars well impressed ; beak cavi- 
ties well excavated; nacre whitish, iridescent. 
Length 62, height 37.5, diam. 27 mm. 
Lake Tanganyika. ; 
Unio bohmu von Martens, Besch. Deuts. Ost-Af., 1897, p. 
223 ho VIL, 11S. 9. 
Nodularia bohmi Stmpson, Syn., 1900, p. 823. 
A large, somewhat ponderous member of the egyptiaca 
group, considerably inflated and long rhomboid in outline. 
NopULARIA AMBIFARIA (von Martens). 
Shell rather small, subquadrate or subrhomboid, convex, 
solid, somewhat inequilateral; beaks only moderately full or 
high; posterior ridge not elevated, rounded; hinge line nearly 
straight; anterior end rounded and angled above; base line 
straight and parallel with the dorsal outline; posterior end 
