NODULARIA 1007 
gose, subcrenulate, one in the right valve, two in the left, 
of equal length, the superior much lower. Accessory anterior 
muscular impression small, subcircular, close to the adductor. 
Length 71, height 40, diam. 29.5, length of ligament 20 
mm.” (von Martens). 
Type locality, Tana-laut, Borneo. 
Unio semmelinki von Martens, Sitzber. Ges. Nat. Fr. Ber., 
1891, p. I111.—SrMPpson, Syn., 1900, p. 834. 
Contradens semmelinkt Haas, Conch. Cab. Unio, 1912, pl. 20, 
figs: 6.7. 
“Related to LU’. javanicus (mutatus Mouss), from Java, but 
larger, proportionately thicker, more inflated, with stronger 
striz, more obtuse behind, the beak sculpture extends less 
widely downward behind and lacks the sharply angled lines 
that in the example of U. mutatus in the Dunker Collection 
from v. d. Busch (with a proportionately equal erosion of 
the beaks) are clearly present, though entirely lacking both 
in the description and the figure of Mousson. The color, 
both externally and internally, is also different. On the other 
hand, the hinge is very much the same. 
As I have seen only a single specimen from either Borneo 
or Java, it is impossible to say whether these differences are 
constant or not.” 
NoDULARIA LATICEPS (von Martens). 
“Shell elliptical, inflated, solid, concentrically striate; epi- 
dermis brown, opaque; anterior end rounded; posterior elon- 
gated. subrostrate; an obtusely angulated line extends back- 
wards and downwards from the beaks, becoming obsolete 
posteriorly ; umbones wide, beaks moderately prominent, at 
about 1/3 of the length; anterior and posterior dorsal margin 
subhorizontal; posterior sloping obliquely; ventral slightly 
curved; cardinal teeth compressed, subelongate, parallel with 
the dorsal margin, slightly crenulate; interior bluish-white, 
pale yellowish towards the umbones. 
a. Length 80, height 41, diam. 34 mm. 
b. Length 66, height 38, diam. 33 mm.” (von Martens). 
Type locality, Lake Danau Baru, Indragiri, Sumatra. 
