1024 NODULARIA 
NODULARIA CUARBGNNIERI (Bourguignat). 
Shell solid, more or less gaping in front or behind or both, 
inflated, irregularly elliptical; beaks moderately full and high, 
rugosely sculptured ; hinge line curved; anterior end rounded ; 
base line curved, fuller behind the middle; dorsal slope sub- 
- truncate above, rounded below into the posterior point of the 
shell; posterior ridge full, widely rounded, ending in a round- 
ed point below the median line; surface lightly, concentrically, 
sculptured ; epidermis varying from dark olive to chestnut or 
reddish-brown; pseudocardinals rather short and strong, rag- 
ged; laterals heavy, curved; nacre whitish or flesh-colored. 
Length 77, height 48, diam. 39 mm. 
Length 64, height 39, diam. 31 mm. 
Length 64, height 43, diam. 29 mm. 
Lake Tanganyika. 
Unio charbonnieri BourcuicNat, Un. and Ir. Tan., 1886, p. 9. 
—Icon. Mal. Tan., 1888, pl. xx, figs. 1, 2—GERMAIN, Moll. 
L. Tan. 1008.9: 72: 
Unio coulboisi BourcuicNat, Un. and Ir. Tan., 1886, p. 12; 
Icon. Mal. Tan., 1888, pl. xx, figs. 3, 4. 
Unio dromauxi Bourcuicnat, Un. and Ir. Tan., 1886, p. 17; 
Icon. Mal. Tan., 1888, pl. xxui, figs. 1, 2. 
Nodularia nilotica (part), SIMPSON, Syn., 1900, p. 821. 
Probably only a form of NV. nilotica. It seems to be solider, 
more inflated, and to be somewhat more decidedly sulcate, as 
well as rather darker colored. It is more evenly elliptical than 
N. randabeli, and has smaller umbones. The latter may be 
only a diseased form of this species. 
Germain, (1. c.), considers charbonnieri a valid species and 
a Unio. 
NopULARIA RANDABELI (Bourguignat). 
Shell irregularly rhomboid, inflated, rather solid, inequilat- 
eral; beaks high and full, elegantly sculptured with rough- 
ened, zigzag-radial ridges ; hinge line nearly straight ; anterior 
end considerably narrowed and rounded; base line nearly 
straight, full behind the middle; dorsal slope almost winged 
