UNIO 713 
Unio blandingianus Lea, Tr. Am. Phil. Soc., V, 1834, p. Lol, 
pl. xv, fig. 44; Obs., I, 1834, p. 213, pl. xv, fig. 44.—ConrRaD, 
Monog., V, 1836, p. 46, pl. XXIIL, fig. 2.—Han_ey, Biv. 
Shells, 1843, p. 200, pl. xxu, fig. 1.—Kuster, Conch. Cab. 
Unio, 1852, p. 36, pl. vi, fig. 2—Sowersy, Conch. Icon., 
XVI, 1866, pl. xxxv, fig. 187. 
Margarita (Unio) blandingianus Lia, Syn., 1836, p. 32; 1838, 
Pp. 22: 
Margaron (Unio) blandingianus Lua, Syn., 1852, p. 33; 1870, 
Pp. 54- 
Unio obesus var. blandingianus SIMPSON, Syn., 1900, p. 742. 
Unio rivicolus Conrav, Am. Jl. Conch., IV, 1868, p. 280, pl. 
Xvill, fig. 4. 
In Florida and Southern Georgia the obesus is almost always 
dark and rough, the epidermis becoming thick, often cloth-like 
and the form is decidedly rhomboid. There is a gradual 
change from the type to this form. The Unio rivicolus ot 
Conrad belongs here instead of under the type. 
Var. paludicolus Gould. 
Shell small, usually narrower in front, rather thin to sub- 
solid, greenish-brown to blackish, sometimes biangulate be- 
hind and having a double posterior ridge. Nacre bluish-white, 
dingy purplish or even coppery. 
Length 42, height 22, diam. 12 mm. 
Florida, various localities. 
Type locality, Florida Everglades. 
Unio paludicolus Goutp, Pr. Bost. Soc. Nat. Hist., II, 1845, 
P- 53- 
Margaron (Unio) paludicolus Lua, Syn., 1852, p. 33; 1870. p. 
54- 
Unio obesus var. paludicolus Stmpson, Syn., 1900, p. 743- 
Unio paludicolor Conran, Pr. Ac. N. Sci. Phila., VI, 1853, p- 
254. 
This form differs from the type merely in degree, not in 
any real characters. It has never been figured, but the Lea col- 
lection contains specimens donated by Dr. Gould from the 
Everglades, the type locality, and some of these are almost 
