No.l2or.. SYNOPSIS OF THE N J lADES—SIMPSOX. 779 



PMla., IV, 1858, p. 65, pi. xi, fig. 47; * Obs., VI, 1858, p. 65, pi. xi, fig. 47.— 

 *SowERBY, Conch. Icon., XVI, 1868, pi. lxxviii, fig. 405.— *B. H. Wkight, 

 Check List, 1888.—* P.etel, Conch. Sam., Ill, 1890, p. 46. 

 ^ Margmon ( TJnio) hlandianus Lea, Syn., 1870, p. 33. 



Western Georgia; Alabama iu the Gulf drainage. 

 (GrTonp of Quadrulapustulosa.) 



Shell round quadrate, truncated behind, full and angled back of the 

 ligament; beaks high; beak sculpture a few coarse ridges which are 

 swollen at the somewhat rounded posterior ridge; surface generally 

 more or less pustulous but sometimes entirely smooth and in some 

 cases slightly corrugated; epidermis often having a broad, faint, green 

 ray; hinge strong; nacre white or purple. 



Animal with the marsupium occupying all four gills throughout; 

 inner gills the larger, free the whole or the greater part of their length 

 from the abdominal sac; branchial opening having clustered, often 

 branching, papillse. 



tQUADRULA PUSTULOSA Lea. 



* Unio pustulosus Lea, Tr. Am. PhiL Soc, IV, 1831, p. 76, pL vii, fig. 7; * Obs., I, 



1834, p. 86, pi. VII, fig. 7.— "* Ferussac, Guer. Mag., 1835, p. 28.—* Hanley, 

 Test. Moll., 1842, p. 180; * Biv. Shells, 1843, p. 180, pi. xxi, fig. 34.—* Catlow 

 and Eeeve, Conch. Nom., 1845, p. 63.—* H. and A. Adams, Gen. Eec. Moll., II, 

 1857, p. 496.—* Chenu, 111. Conch., 1858, pi. xxiii, figs. 2, 2a, 26.—* Calkins, 

 Pr. Ottawa Acad. N. Sci., 1874, p. 44.—* B. H. Wright, Check List, 1888. 



^Margarita {Unio) pustulosus Lea, Syn., 1836, p. 15; 1838, p. 15. 



*Margaron {Unio) pustulosus Lea, Syn., 1852, p. 22; 1870, p. 33. 



*Quadrnla pustulosa Baker, Moll. Chicago, Pt. 1, 1898, p. 86, pi. xxv, fig. 2; 

 xxviii, fig. 13. 



* Unio verrucosa Valenciennes, Eec. Obs. Zool. Anat., II, 1833, p. 231, pi. liii, 



fig. 2. 



* Unio nodulosus Say, Am. Conch., VI, 1834. 



*Unio prasinus Conrad,' New F. W. Shells, 1834, p. 44, pi. in, fig. 1, p. 71. — 



* Ferussac, Guer. Mag., 1835, p. 29.— *Moller, Syn. Nov. Gen., 1836, p. 

 208.— * CONKAD, Monog., IX, 1837, p. 79, pL XLiv, fig. 2.—* Chenu, Bib. 

 Conch., Istser., Ill, 1845, p. 22, pi. in, fig. 1.—* Conrad, Pr. Ac. N. Sci. 

 Phila., VI, 1853, p. 255.— * Eeeve, Conch. Icon., XVI, 1864, pi. vii, figs. 26, 

 26a, 26&.— * B. H. Wright, Check List, 1888. 



*Unio bullatits y&t. prasinus P^tel, Conch. Sam., Ill, 1890, p. 146. 

 *Unio lullatus Conrad, Nefw F. W. Shells, 1834, p. 68; Monog., X, 1838, p. 82, 

 pi. XLV, fig. 2.— *Kuster, Conch. Cab. Unio, 1852, p. 47, pi. ix, fig. 3. — 



* Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 245.— * Eeeve, Conch. Icon., 

 XVI, 1864, pi. xn, fig. 43.—* Pjetel, Conch. Sam., Ill, 1890, p. 146. 



*Unio dorfeuiUianus Lea, Tr. Am. Phil. Soc, VI, 1838, p. 73, pi. xvii, fig. 54; 



* Obs., II, 1838, p. 73, pi. xvii, fig. 54.— * Troschel, Arch, fur Naturg., V, 

 1839, II, p. 237.— * Hanley, Test. Moll., 1842, p. 179; *Biv. Shells, 1843, p. 

 179, pi. xxni, fig. 10. — * Catlow and Eeeve, Conch. Nom., 1845, p. 58. — 



* Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 248.— *H. and A. Adams, Gen. 

 Eec. Moll., II, 1857, p. 497.— *Chenu, 111. Conch., 1858, pi. xxv, figs. 5,5a, 5b. — 



* Eeeve, Conch. Icon., XVI, 1864, pi. x, fig. 38.—* B. H. Wright, Check List, 



^A smooth form of pustulosus, according to the type in Philadelphia Academy. 



