578 UNIO 
rather stout, crenulate above; lateral tooth elongate, slightly 
curved, rugosely granulate posteriorly. 
Length 52.5, height 26, diam. 18.5 mm.” ( Pollonera. ) 
‘Type locality, Hawash River, Shoa, Africa. 
Unio travesti PotrLtonera, Bull. Soc. Mal. It., XIII, 1888, p. 
Scapleil, Hes. T4505. 
Nodularia traversii SIMPSON, Syn., 1900, p. 825. 
“This species belongs to the group of U. dembee, but differs 
from it very decidedly. Its shell, although not much superior 
to the latter in its greatest convexity, has however the appear- 
ance of being much more inflated and this comes from the fact 
that in the former the curvature of the valves continues reg- 
ularly even to the margins, while in the U. dembee the valves 
are attenuated and flattened towards the margins. The great- 
est difference, however, is on account of the fact that the pos- 
terior part is more rostrated and the upper dorsal margin more 
curved, the ventral margin is more distinctly incurved, the lat- 
eral tooth is shorter and more curved and the area is larger. 
It resembles also the U. jickelii Bourg., but may be distin- 
cuished from that species by the more anterior position of 
the beaks, the more pointed posterior end, the more curved 
dorsal margin and the more incurved ventral margin.” 
UNIO MASHON@: Preston. 
“Shell elongately ovate, rather tumid, covered with a dark 
blackish-brown periostracum, sculptured with somewhat coarse 
and irregular concentric striz, angled posteriorly; umbones 
rather large, prominent though much eroded; dorsal margin 
nearly straight ; ventral margin almost straight, but very slight- 
ly constricted towards the middle; anterior side rounded above, 
sloping below; posterior side produced, bluntly acuminate ; an- 
terior lateral teeth very short; posterior laterals long and 
coarse; cardinal teeth in right valve wedge-shaped, solid in left 
valve, broad, serrated: anterior adductor scar ovate, moderate- 
ly deep; posterior adductor scar narrowly fan-shaped, well im- 
pressed ; pallial impression coarse, nacreous, pinkish in colour ; 
outer margins of interior of shell nacreous, bluish-white. 
Long. 80; lat. 37.5 mm.” (Preston.) 
