NODULARIA 965 
Length 37, height 18, diam. 12 mm. Beaks situated at 3-5 
of the length; ligament extending to 3-4 of the length.” (von 
Martens). 
Type locality, Hangang River, Middle Korea. 
Unio verrucifer VON Martens, S. B. Nat. Fr., 1894, p. 216.— 
SIMPSON, Syn., 1900, p. 862. 
“The Chinese Unio douglasie Gray (murchisonianus Lea) 
is very close to this species, but is more elongate posteriorly 
and consequently the beaks are proportionately more anterior 
and the height less.” 
NOpULARIA BO&TTGERT (Neumayr). 
“Shell thin, inequilateral, rather long-oval, slightly inflated, 
beaks situated in the first third of the length; rounded in front, 
feebly keeled behind, rounded, a little pointed. Beaks not 
prominent, strongly wrinkled, eroded. Posterior slope feebly 
defined. Hinge very feebly developed, in each valve a thin, 
anteriorly directed, long, lamelliform cardinal tooth, in the left 
valve is a second rudimentary tooth parallel with the first. 
Lateral teeth feeble. Anterior muscular impressions slight, 
posterior very faint. Nacre white, iridescent. Epidermis 
blackish-brown. 
Length 55, height 28, diam. 20 mm.” (Neumayr). 
Type locality, Region of Tsching-kiang, Province of Kiang- 
su, China. 
Unio bettgeri NeuMAyR, Ergebnisse d. Reise Szecheny Ost- 
asien, II, 1898, p. 645, pl. 11, fig. 3. 
“Of all the allied species, Unio sculptus Deshayes, from the 
Province of Petschili, China, is the nearest and in fact the 
figure of that species in contour, size, sculpture and indeed in 
the great part of all the characters shows no important differ- 
ences ; only in the structure of the hinge is there such a marked 
difference that it is impossible to bring them together as one 
species. In Unio sculptus the posterior cardinal tooth is tri- 
angular, whereas in Unio bettgeri it is a rudimentary, forward- 
projecting lamella. Unio pfisteri Heude and rufescens Heude 
also clearly differ in the character of the hinge; there is also 
