850 QUADRULA 
Unio dorfeuillianus Lea, Tr. Am. Phil. Soc., VI, 1838, p. 73, 
pl. xvii, fig. 54; Obs., II, 1838, p. 73, pl. xvu, fig. 54.—Han- 
LEY, Biv. Shells, 1843, p. 179, pl. xxu111, fig. 10.—CHENU, IIl. - 
Conch., 1858, pl. xxv, figs. 5, 5a, 5b.—Rereve, Conch. Icon., 
XVI, 1864, pl. x, fig. 38.—Cat (part), Tr. Ac. N. Sci., St. 
Louis; Vil; 1895;"p: 40-pls) xan; XT AKIVs KV, tess Tees 
Margarita (Unio) dorfeuillianus Lea, Syn., 1838, p. 15. 
Margaren (Unio) dorfemlianus Lea, Syn., 1852, p. 22; 1870, 
P. 33- 
Unio uber Conrap, Am. Jl. Conch., II, 1866, p. 270, pl. xv, fig. 
10: 
Abundant throughout the most of the Upper Mississippi 
drainage and very variable. The anterior one-fourth to two- 
fifths of the surface is usually smooth, the remainder is gener- 
ally furnished with various sized pustules, though in some cases 
the whole shell is destitute of tubercles. A large quadrate 
shell with high beaks from the Wabash was called Unio dor- 
fenillianus by Dr. Lea, but it scarcely differs from shells, which 
he has placed with his pustulosus. Two of the specimens he 
has placed with dorfeuillianus are from Columbus, Mississippi, 
and are certainly Q. mortoni Conrad. 
Var. schoolcraftensis (Lea). 
More quadrate and compressed than the type, the young us- 
ually with a broad, often broken, ray in the middle of the disk 
with narrow ones on the dorsal slope; surface varying from 
smooth to pustulous. It is distributed over much the same 
area as the type. 
Length 72, height 64, diam. 35 mm. 
Mississippi valley. 
Type locality, Fox River of Green Bay. 
Unio schoolcraftensis Lea, Tr. Am. Phil. Soc., V, 1834, p. 37; 
pl. 1, fig. 9; Obs., I, 1834, p. 149, pl. 11, fig. 9.—SOWERBY, 
Conch. Icon., XVI, 1868, pl. 1, fig. 3; pl. x1, fig. 47. 
Margarita (Unio) schoolcraftensis Lea, Syn., 1836,. ps 25% 
1838, p. 15. 
Margaron (Unio) schoolcraftensis Lea, Syn., 1852, p. 22. 
