UNIO DAT 
Var. pentheri Sturany. 
“Dr. Penther collected in Panda ma tinka, which is next to 
the middle stream of the Zambezi River, two specimens of a 
Unio, which are most probably to be referred to U. caffer, but 
which differ from the type in shape and proportions, for whic. 
reason | shall mention them here under a distinct varietal 
name. For greater clearness | also give two figures, one of the 
left side and the other of the dorsal aspect. 
The two shells measure respectively: length 51.5 and 57; 
height 26.5 and 28.5; diam. 18 and 18.5 mm. 
The distance from the front and hinder ends is 13: 38.5 in 
the smaller specimen and 14 : 43 mm. in the larger. 
These proportions point to a near relationship with U. na- 
talensis Lea, but that is also a synonym of U. caffer Krss., 
according to F. Smith.” (Sturany). 
Unio caffer var. pentheri Sturany, Denks. Math-Nat. Classe K. 
Akad. Wissen., LX VII, 1808, p. 627, pl. 111, figs. 64-65. 
The above species is an abundant widespread, and variable 
one, and has consequently received a number of names. ‘The 
variety africanus is much smaller and smoother than the type. 
Unio vaalensis Chaper, of which specimens from the type lot 
are before me, seems to be merely a small form, possibly young, 
in which the posterior point is not depressed. Lea’s Unio 
natalensis is evidently a young U. caffer; his verreauianus is 
one of the adult forms. 
Connolly (1. c.), on the authority of Haas refers both 
seyheri and cyamus to this species. 
UNIO TRAVERSIT Pollonera. 
“Shell olive-brown, somewhat shining, concentrically striate, 
pinkish within, rather thick, inflated, ovate-oblong, subrostrate ; 
umbones anterior, obtuse, not prominent, eroded; anterior end 
~ rounded, narrow; posterior end elongated; with the dorsal 
margin, as far as the angle, slightly curved, thence obliquely 
curved; ventral margin slightly incurved behind the middle; 
area lanceolate; cardinal tooth in the right valve elongate, 
