QUADRULA 849 
depression above it; surface, excepting at the anterior part, 
usually more or less covered with warty or lachrymose tuber- 
cles, sometimes nearly or quite smooth; epidermis tawny or 
tawny-greenish in young shells, often with a wide, broken, 
bright green ray, dirty brownish in old shells ; pseudocardinals 
strong, triangular, more or less ragged, two in the left valve 
and three in the right; lateral of the right valve sometimes 
partly double; beak cavities deep, compressed; muscle scars 
impressed ; nacre white, thinner and iridescent behind. 
Length 105, height 95, diam. 70 mm. 
Length 75, height 72, diam. 40 mm. 
Length 56, height 51, diam. 35 mm. 
Entire Mississippi drainage; Michigan; Lake Erie. 
Type locality, Ohio; Alabama river. 
Unio pustulosus Lea, Tr. Am. Phil. Soc., IV, 1831, p. 76, pl. 
vil, fig. 7; Obs., I, 1834, p. 86, pl. vir, fig. 7—HAnN Ley, Biv. 
Shells, 1843, p. 180, pl. xx, fig. 34.—CneEnu, III. Conch., 
LQ5O. pl, XXIU, oes..2,. 20. 2b. 
Margarita (Unio) pustulosus Lea, Syn., 1836, p. 15; 1838, p. 
1S. 
Margaron (Unio) pustulosus Lea, Syn., 1852, p. 22; 1870, p. 
33. 
Ouadrula pustulosa BAKER, Moll. Chicago, Pt. 1, 1898, p. 86, 
pl. xxv, fig. 2; xxvu, fig. 13.—Srmpson, Syn., 1900, p. 779. 
Unio verrucosa VALENCIENNES, Rec. Obs. Zool. Anat., II, 
Lege Sale pk Litt, figs 2. 
Unio nodulosus Say, Am. Conch., VI, 1834. 
Unio prasinus Conrap, New F. W. Shells, 1834, p. 44, pl. 311, 
fig. 1; Monog., TX, 1837, p. 790, pl. xiv, fig. 2—CHENU, Bib. 
Gonch:; -ist\ ‘ser; TL, 2845; p: 22;-pl. 10,. fig: 1.—REEvE, 
Conch. Icon., XVI, 1864, pl. vir, figs. 26, 26a, 26D. 
Unio bullatus var. prasinus Pavrer, Conch. Sam., III, 1890, p. 
146. 
Unio bullatus Conrap, New F. W. Shells, 1834, p. 68; Monog., 
X, 1838, p. 82, pl. xiv, fig. 2—Kusrer, Conch. Cab. Unio, 
1852, p. 47, pl. tx, fig. 3—Rreve, Conch. Icon., XVI, 1864, 
pl. x11, fig. 2. 
