960 NODULARIA 
varying from greenish through olive to black, usually smooth 
and shining; pseudocardinals compressed, the two in the left 
valve often partly united; laterals nearly straight, granular, 
beak cavities moderately deep; muscle scars shallow; nacre 
bluish-white. 
Length 55, height 27, diam. 18 mm. 
China; Amurland; Formosa; Cambodia ? 
Unio douglasie Gray, Griff. An. King., XII, 1833, (p. 601 in- 
dex, 1834) pl. <xa,~fieae. 
Nedularia dowglasie SIMPSON, Syn., 1900, p. 808.— Haas, 
Con. Cab., Unio, 1910, p. 68, pl. vi, figs. I-10. 
Unio murchisonianus Lea, Tr. Am. Phil. Soc., V, 1834, p. 33, 
pl. mm, fig. 6; Obs., I, 1834, p. 145, pl. 111, fig. 6—HANLEy, 
Biv. Shells, 1843. p. 177, pl. xx1, fig. 53.—Kuster, Conch. 
Cab. Unio, 1856, p. 166, pl. xiv, figs. 3, 4—CHENU, Man., 
1859, Il, p. 142, fig. 701—Sowersy, Conch. Icon., XVI, 
1866, pl. Xxxvut, fig. 207. 
Margarita (Unio) murchisonianus Lea, Syn., 1836, p. 14; 
1838, p. 14. 
Margaron (Unio) murchisonianus Lea, Syn., 1852, p. 21; 1870, 
Dp: 32: 
Unio osbecki Puiiivrt, Zeits. fiir Mal., 1845, p. 164; Conch., 
III, 1847, p. 45, pl. m1, fig. 1—Kustrr, Conch. Cab., Unio, 
1861, p. 236, pl. LXxrx, fig. 3—Sowerry, Conch. Icon., XVI, 
1868, pl. LXTxX, fig. 353. 
Margaren (Unio) osbecki LEA, Syn., 1852, p. 21; 1870, p. 32. 
Unio nux-persicus DuNn«eER, Zeits. fiir Mal., 1848, p. 83.— 
Muscraver, Phot. Conch., 1863, pl. 1, fig. 10.—SOWERBY, 
Conch: Teonfox V 1, 1868; ‘pl. pscxanne hess 735 
Margaron (Unio) nux-persicus L&a, Syn., 1870, p. 32. 
Unio wrighiti Lea, Pr. Ac. N. Sci. Phila., IX, 1865, p. 75; ie 
Ac. N.Sei. Phila’, VI21868, p. 263, pla xxi Heo7 VOps., 
XIP, 1860)795 43, pl acxcxix, feo7 
Margaron (Unio) wrightii Lea, Syn., 1870, p. 32. 
Unio sculptus Desuayrs, Bull. Nouv. Arch. Mus., IX, 1873, 
p. 9, pl. 1, figs. 3, 3a.—Herupr, Conch. F. Nank., III, 1877, 
plex Xiv, seas 1 
Unio dactylinus Hxupr, Conch, F. Nank., 1885, pl. LxXv. 
