7220 UNIO 
Type locality, Pojang Lake, Kiu-kiang, Kiang-si Providence, 
China. 
Unio flexvicosus NeuMAyR, Ergebnisse d. Reise Szecheny Ost- 
asien, IT, 1898, p. 642, pl. m1, fig. 2. 
“Unio flexicosus, it is true, is known only by a single left 
valve, but this has such a remarkable character and so interest- 
ing a form that it is entitled to be made the type of a new 
species. In the small group of twisted unios, U. picinalis 
Heude is the nearest, but ditfers at first glance by its much 
stronger twist. Other species, such as U. contortus Heude and 
triformis Lleude differ still more.” 
Unio SUPERSTES Neumayr. 
“Shell oval, thick, inequilateral, somewhat inflated, slightly 
angulate posteriorly and very little truncated. Beaks situated 
at the first third of the length, not prominent, somewhat erod- 
ed. In the left valve one moderate, triangular cardinal tooth 
and in front of it a very feeble lamelliform one, in the cavity 
between them is an elevated ridge, which shows that the 
cardinal tooth of the right valve is bifid. Lateral tooth long 
and strong. Anterior muscular impression distinct, deep, pos- 
terior slightly larger and much weaker. [pidermis olive- 
brown. Nacre white. The size can not be accurately stated, 
as the specimen is imperfect.” (Neumayr). 
Type locality, Tali-fu, Province of Yunnan, South China. 
Unio superstes Nwumayr, Ergebnisse d. Reise Szecheny Ost- 
asien, Ti Sreo8; .p. 642" pl. me. 
“Of this species I have only a single, somewhat damaged 
valve. I would not have described a new species from such 
a poor specimen, if it were not that, on account of its very 
close relationship to the European Pliocene types, it 1s import- 
ant to the interesting study of the Chinese fresh-water fauna. 
It stands so exceedingly close to Unio nicolaianus Brus. from 
the middle Paludina-beds, the ancestral form, from which a 
whole race of other species has been evolved, that one, watch- 
ing for the greatest difference, would find it very difficult to 
find any variation between them, the beaks in the first species 
