UNIO "| gaa 
{nicolaianus) are very slightly further forward, the anterior 
end is somewhat less rounded and the cavity between the 
cardinal teeth of the left valve a very little smaller and without 
the elevated ridge. These insignificant differences are imma- 
terial and there can be no error in referring to the intimate 
relationship between a //nio of the European Tertiary and a 
living form from the Chinese or American area.” 
UNIO PANTOENSIS Neumayr. 
“Shell thin, rather small, inequilateral, quadrate, slightly in- 
flated, rounded in front, truncate behind, with a slight appear- 
ance of being winged; dorsal margin slightly curved; ventral 
margin straight. Surface with irregular growth lines, angu- 
larly wrinkled at the beaks. Beaks not prominent, situated in 
the first third of the length. Hinge with moderately long, 
strong laterals: in the right valve a single, rather feeble, for- 
ward projecting, lamelliform cardinal tooth; in the left valve 
two similar ones, of which one begins under the beak and 
reaches far outward, while the other is direct. Muscular im- 
pressions very faint. Nacre bluish. Epidermis olive-brown. 
Length 34, height 21, diam. 12 mm.” (Neumayr). 
Type locality, Panto, Yunnan. 
Unio pantoensis NeuMAvyR, Ergebnisse d. Reise Szecheny Ost- 
asien, II, 1898, p. 644, pl. 1, fig. 5. 
Unto HERES Neumayr. 
“Shell oval, thick, slightly inflated, inequilateral, narrower 
in front, beaks situated in the front third of the shell, not prom- 
inent, the greatest breadth being behind the beaks. Shell very 
indistinctly keeled posteriorly and somewhat truncated. Beaks 
somewhat eroded. Hinge of the right valve with a moderately 
stout cardinal tooth, striate on the upper side and a long, 
strong lateral. eft valve unknown. Anterior muscular im- 
pression smail and deep, posterior somewhat larger, but very 
faint. Epidermis olive-brown. Nacre white.” (Neumayr). 
Type locality, Lake near Tali-fu, Yunnan. 
Unio heres NeumMayr, Ergebnisse d. Reise Szecheny Ostasien, 
IT, 1898, p. 644, pl. 1, fig. 6. 
