1006 NODULARIA 
Unio javanus Lea, Pr. Am. Phil: Soc, 1, 1840, p. 285; Pr. 
Am: Phils Soe; “VII 18429 p220) pleexvinn, somes ze Obs: 
III, 1842, p. 58, pl. xvi, fig. 37—CuHENU, Ill. Conch., 1858, 
pl. xxvut, figs. 4, 4a, 4b.—Kuster, Conch. Cab. Unio, 1856, 
ps .138;). pl. IA, fisting 1861" p.-236; .plsiaecix ties ao — 
Sowerby, Conch. Icon., XVI, 1868, pl. xc, fig. 480. 
Margaron (Unio) javanus La, Syn., 1852, p. 30. 
Unio exilis DuNKER, Zeits. fur Mal., II, 1846, p. 109.—Mous- 
son, I,. and S$. W. Moll. Java, 1849, p. 92, pl. xv1, fig. 3. 
Margaron (Umo) exilis LEA, Syn., 1852, p. 20. 
Unio mutatus Mousson, L. and S$. W. Moll. Java, 1849, p. 92, 
pls evie fies. 12: 
Margaron (Unio) mutatus LEA, Syn., 1852, p. 20. 
Unio mederianus Kuster, Conch. Cab. Unio, 1861, p. 242, pl. 
Ty SNORE 
The type does not seem to be in the Lea collection, but it 
contains a typical example of larger dimensions, the measure- 
ments of which | have given. 
Haas has recently, (Nachr. Deutsch. Mal. Ges., 1913, p. 35),. 
made this species the type of a new genus, Contradens. 
NoOpDULARIA SEMMELINKt (von Martens). 
“Shell transversely elliptical, solid, concentrically and rather 
coarsely striate, yvellowish-brown, blackish posteriorly ; anterior 
end short, rounded; posterior end elongate, subrostrate, with 
three angular lines radiating from the beaks, the lowest very 
obtuse, raised, then obtusely biangulated; ventral margin 
slightly arcuate, distinctly ascending anteriorly; beaks situated 
at 2/7 of the length; umbones quite inflated, eroded, sculptured 
in front and behind with elevated, granulated lines, concen- 
tric in front and radial behind. Areola distinct, narrowly 
lanceolate, horizontal, smooth; area prominent, convex. Nacre 
pale yellowish-flesh-color, with a deeper colored submarginal 
band. Cardinal teeth compressed, lamellar, obliquely rugose, 
subcrenulate, two in the right valve, inequal, one in the left 
valve with an accessory obtuse, subvertical tubercle. Poste- 
rior teeth lamellar, not very heavy, quite arcuate, obliquely ru- 
