UNIO 579 
Type locality, A sluit about 16 miles from Eukeldoorn, Ma- 
shonaland. 
Unio mashone Preston, Ann. Mag. Nat. Hist., (8), VI, 1910, 
p. 61, pl. rv, fig. Io. 
Cafferia mashone Connotay, Ann. S. A. Mus., XI, IQ12, p. 
Ze 
“Very similar to caffra, from which it may be separable 
through the absence of the umbonal scar.” (Connolly. ) 
Unio JICKELt (Simpson). 
Shell elongated, solid, inflated, very inequilateral, subrhom- 
boid; beaks apparently neither full or high; anterior end 
rounded and somewhat truncated; dorsal and ventral outlines 
nearly straight and parallel, the latter slightly full toward the 
hinder end; posterior slope having a long, oblique truncation ; 
posterior ridge full, rounded or feebly biangulate, ending be- 
low the median line in a faint, narrow biangulation, surface 
concentrically sulcated ; epidermis fuscous-olive ; teeth strong; 
pseudocardinals short and ragged; muscle scars impressed ; 
nacre bluish-white, iridescent. 
Length 80, height 30.75, diam. 23.5 mm. 
Northeast Africa. 
? Unio teretiusculus JicKeLt, Faun. Moll., N. O. Af., 1874, p. 
27O np Si, eS: 33° 30,, 3p. 
Nodularia jickeli SIMPSON, Syn., 1900, p. 826. 
Unio fourtaui PALLARy, Bull. Inst. Egypt, II, 1902, p. 95. 
Jickeli figures the above and refers it to Unio teretiusculus 
of Philippi with a question. I am sure that it is not that spe- 
cies at all, but a larger form with much less intlated umbones, 
solider structure, more decided concentric sculpture and 
stronger, more ragged pseudocardinals. Jickeli figures the true 
teretiusculus as I understand it. 
Unio acuminatus H. Adams. 
Shell somewhat elongated, decidedly rhomboid, inequilateral, 
subinflated, apparently subsolid, beaks full with strong, nod- 
ulous, zigzag sculpture, which extends out on to the disk; 
