1032 NODULARIA 
NODULARIA AQUATORIA (Morelet). 
Shell irregularly obovate, subinflated, rather thin, inequi- 
lateral; beaks full and high, their sculpture consisting of a few 
nodules and zigzag-radial ridges; hinge line nearly straight; 
anterior end narrowed and rounded, cut away a little below; 
base line nearly straight to behind the middle, where it is full 
and almost forms an angle, rising in an oblique direction to 
the produced posterior- point; dorsal slope obliquely truncate; 
posterior ridge full, rounded, ending about on the median 
line; surface with strong growth lines in front, nearly smooth 
on the center of the disk, ashy-green or brownish-green, fee- 
bly rayed; epidermis either smooth or roughened; teeth deli- 
cate, lamellar; nacre bluish-white. 
Length 55, height 32, diam. 23 mm. 
Length 48, height 31, diam. 20 mm. 
Length 28, height 20, diam. 13 mm. 
Congo drainage. 
Unio equatorius Morrie, Jl. de Conch., XXXIII, 1885, p. 
ai pl asics. 9: 
Nodularia equitoria SIMPSON, Syn., 1900, p. 823. 
Umi landanensis SCHEPMAN, Notes Leyden Mus., VIII, 1891, 
p. 113, pl. vu, figs. 3a, 3b.—GrERMAIN, Bull. Mus. Nat. Hist., 
1907, p. 430, fig. 20. 
A number of specimens are before me from different local- 
ities in the Congo basin showing much variation in size and 
form. ‘Two lots are from Leopoldville, each showing decided 
variation among the individuals of each lot. It may be well 
to retain the name /andanensis in a varietal sense for the 
smaller, rougher forms. | have examined gravid females of 
the e@quataria and found the inner gills only filled with em- 
bryos. forming smooth, even pads, like those of the Uniones of 
South America. 
3y an error the name @quatoria was misspelled in the Synop- 
sis. 
NODULARIA ELEGANS (Rochebrune). 
“Shell elliptic-oval, quite inflated, well rounded anteriorly, 
with the posterior region almost twice as long as the anterior. 
The shell, which is quite strongly anodonti-form in appearance. 
