UNIO 581 
Reeve’s description is very brief and his figure does not look 
like any of the African species I am acquainted with. Jickeli’s 
figures are probably more accurate and represent a shell look- 
ing something like a short Unio pictoruwm, to which Reeve 
likens his shell. 
Unio LourDELI Bourguignat. 
Shell small, somewhat elongated, inflated, rhomboid, inequi- 
lateral, with the greatest diameter behind the middle; beaks 
only moderately full, their sculpture apparently zigzag radial 
or corrugated ; dorsal line a little curved; anterior end round- 
ed; base straight or incurved in old specimens; dorsal slope 
obliquely truncated or having a curved outline; posterior ridge 
full, rounded, ending at t’*e base of the shell; surface concen- 
trically sculptured; epidermis greenish-brown; nacre reddish 
or bluish-white. 
Length 31, height 16, diam. 12 mm. 
Victoria Nyanza Lake. 
Unio lourdeli Bourcuicnat, Bull. Soc. Mal. Fr., TV, 1887, p- 
271.—SMiITH, Ann. and Mag., X, 1892, p. 128, pl. x11, figs. 
13-14. 
Nodularia lourdelli Simpson, Syn., 1900, p. 826. 
I have never seen this species but from the figures given by 
Smith it seeems to be closely allied to U. acuminatus. It 1s 
smaller than that species and has stronger and rougher con- 
centric sculpture. 
Var. smithi Germain. 
“Dr. E. A. Smith has figured a beautiful variety of this 
species characterized, especially, by its obliquely convex pos- 
terior margin and very sinuous ventral margin. I give this 
shell the name of variety smithi.” (Germain. ) 
Unio lourdeli (part), Smiru, Ann. Mag. Nat. Hist. (6), X, 
1892, p. 128, pl. x11, fig. 15. 
Unio lourdeli var. smithi GERMAIN, Bull. Mus. Hist. Nat. 1905, 
A. 306: | 
