NODULARIA IO31 
ged growth lines; epidermis yellowish-brown with a few faint 
rays; teeth compressed, lamellar; nacre bluish-white. 
Length 26, height 16, diam. 10 mm. 
Fouladougou, Niger; Upper Senegal. 
Reneus fouladougouensis JoussrAuME, Bull. Soc. Zool. Fr., 
XI, 1886, p. 485, pl. x11, figs. 6, 6a. 
Nodularia fouladougouensis SIMPSON, Syn., 1900, p. 823. 
It is quite difficult to be sure, from the figures and often 
imperfect descriptions, of the validity of a number of the so- 
called species of this group. This seems to be very close to 
N. renea, but it is more angularly full at the posterior base 
and more drawn out behind than that species. In outline it is 
much like Lampsilis vanuxemensis of the Southeastern United 
States. 
NopuLARIA GABONENSIS (Kuster). 
Shell rhomboid elliptical, rather inflated, thin, inequilateral ; 
beaks high and full, with zigzag, subnodulous sculpture; pos- 
terior ridge full near the beaks, rounded, fading out below and 
ending below the median line; anterior end a little narrowed, 
rounded ; base line well curved, slightly fuller behind the mid- 
dle; hinge line lightly curved; dorsal slope obliquely subtrun- 
cate; surface nearly smooth, with a few wrinkles on the dor- 
sal slope and faint indications of corrugations on the anterior 
end ; epidermis ashy-greenish or yellowish-green, lightly rayed, 
somewhat shining; teeth delicate and lamellar; beak cavities 
well impressed; nacre bluish or whitish, somewhat iridescent. 
Length 38, height 23, diam. 16 mm. 
Gaboon River, West Africa. 
Unio gabonensis Kuster, Conch, Cab. Unio, 1862, p. 291, pl. 
XCVII, fig. 7. 
Margaren (Unio) gabonensis Lea, Syn., 1870, p. 47. 
Nodularia gabonensis Stwpson, Syn., 1900, p. 823. 
There is a shell in the Lea collection named Unio gabonen- 
sis, from Isabon, that exactly agrees with the form and di- 
mension of Kuster’s figure, but is not quite so brightly colored 
or so decidedly rayed. In outline it is not so angular as N. 
equatoria. 
