554 UNIO 
left valve and one in the right; muscle scars well marked; 
beak cavities rather deep; nacre white, flesh-color or salmon- 
tinted, thicker in front. 
Length &o, height 51, diam. 32 mm. 
Length 63, height 46, diam. 26 mm. 
Length 61, height 35, diam. 20 mm, 
Southern Europe; Asia Minor; Assyria; Morocco; Algiers. 
Unio littoralis LAMARCK, Syst. An. sans Vert., 1801, p. 114.— 
DRAPARNAUD, Hist. Moll. Fr., 1806, p. 135, pl. x, fig. 20.— 
DESHAYES, Enc. Method., II, 1827, p. 151, pl. ccxivim, fig. 
2.—ROosSMASSLER, Icon., V, 1837, p. 21, pl. xxiv, fig. 340.— - 
Sowersy, Conch. Man., 1839, fig. 145.—Gras, Moil. Isere., 
1840, p. 72, pl. v, fig. 20.—HAN Ey, Biv. Shells, 1843, p. 201, 
pl. xx1, fig. 13.—Durvy, Hist. Moll. Fr., 1852, p. 632, pls- 
Xxill, fig. 8; xxiv, figs. 5, 6, 8—RossmassiER, Icon., III, 
1854, p. 37, pl. LxIx, fig. 850.—Drover, Nay. Fr., II, 1857, 
p. 66, pl. 111, figs. 1, 2—RereEve, Conch. Icon., XVI, 1865, pl. 
Xx, fig. 98.—-Stmpson, Syn., 1900, p. 691. 
Unio littoralis var. mimor ROSSMASSLER (part), Icon., XI, 1842, 
Pp. 14, pls Eve bes. 743) 2 Ag. 
Unio littoralis var. acarranicus Kone.r, Icon., IV, 1879, p. 40, 
pl. CL xia 10 28. 
Unio littoralis var. pianensis Kopevyr, Icon., 1V, 1888, p. 43, 
pl. cLx11t, fig. 1648. 
Margarita (Unio) htoralis Lea, Syn., 1836, p. 32; 1838, p. 22. 
Margaron (Unto) litoralis Lea, Syn., 1852, p. 34; 1870, p. 54. 
Unio litoralis var. uwmbonatus ROSSMASSLER, Icon., XII, 1844. 
Be 27, Di EVI, 1S. 754. 
Unio granosus SCHUMACHER, Ess. Nouv. Syst., 1817, pl. 11, 
fig. 1. 
Unio brevialis LAMARcK, An. sans Vert., VI, 1819, p. 73. 
Unio nana I,AMARCK, An. sans Vert., VI, 1819, p. 76. 
Unio rubens MENKE, Syn., 1830, p. 149.—RossMASSLER, Icon., 
V and’ Vik 1337p: 56; pl: xxix ieee: 
Unio subtetragona Micuaup, Comp. Hist. Moll. Fr., 1831, D- 
1a 
