630 UNIO 
Unio jayensis Lea, Tr. Am. Phil. Soc., VI, 1838, p. 28, pl. rx, 
fig. 23; Obs.,. Il, 1838, p. 28, pl. 1x, fig. 23.-—Haniey, Biy, 
Shells, 1843, p. 206, pl. xxi, fig. 53.—CHENu, IIl. Conch., 
1858, pl. xxi, figs. 4, 4a, 4b.—Sowersy, Conch. Icon., XVI, 
1867, pl. Lx, fig. 301; pl. Lxvu, fig. 343?—Simpson, Syn., 
[QOOs ps 713: 
Margarita (Unio) jayensis Lea, Syn., 1836, p. 37; 1838, p. 24. 
Margaron (Unio) jayensis Lea, Syn., 1852, p. 37. 
Elhiptio jayensis ORTMANN, .Ann. Car. Mus., VIII, 1912, p. 
270. 
Unio prasinatus Conrap, Am. Jl. Conch., II, 1866, p. 279, pl. 
Venn LAR 
Margaron (Unio) jayanus Lra, Syn., 1870, p. 60. 
Unio javanus B. H. Wricut, Check List, 1888.—Srmpson, 
Pro? s. Nate Mus. xX Ve18025p. 4 1Oupl nce teeae 
Unio simpsoni B. H. Wricnt, Check List, 1888. 
Umo marshu B. H. Wricwt, Pr. Ac. N. Sci. Phila., 1888, p. 
PIO A pl. \e ties 2: 
Unio tryom B. H. Wricut, Pr. Ac. N. Sci. Phila., 1888, p. 
120; splavil, fie. 2: 
Generally more elongated, less inflated, thinner and duller 
colored within and without than U. buckleyi. But there are 
intermediates, which I find very difficult to name and which 
might about as well be placed in one species as in the other. 
Unto suBLURIDUS Simpson. 
Shell rather small, subrhomboid or subelliptical, convex, 
solid or subsolid, inequilateral; beaks apparently not full or 
high; posterior ridge low, widely rounded or widely, feebly 
biangulate ending behind at and below the median line in a 
wide rounded point or a biangulation; outline of dorsal slope 
obliquely subtruncate, but curved; base line curved, sometimes 
full behind the middle; anterior-end narrowed a little, round- 
ed; surface nearly smooth; epidermis tawny-brown or pale 
reddish-brown, slightly concentrically wrinkled, subshining ; 
pseudocardinals subcompressed, two in the left valve and one 
