634 J'MOCMMDmaS of the national museum. volxxh. 



^Anodovta housatonica Linsley, Am. Jl. Sci., 1845, p. 277. — *STrMPSON, Shells of 

 N.Eng., 1851, p. 15.— *H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 502.— 

 *P^TEL, Conch. Sam., Ill, 1890, p. 180. 



St. Lawrence drainage; north to Lake Winnipeg; south in streams 

 flowing into the Atlantic to Virginia; not reported from Michigan. 



fANODONTA HALLENBECKII Lea. 



*Anodonta hallenbeckii Lea, Pr. Ac. N. Sci. Phila., II, 1858, p. 139; *J1. Ac. N. 

 Sci. Phila., IV, 1859, p. 232, pi. xxxii, fig. 112; *0b8., VII, 1859, p. 50, pi 

 XXXII, fig. 112. — *Clessin, Conch. Cab. Ano., 1873, p. 95, pi. xxviii, figs.3^ 

 4.— *B. H. Wkight, Check List, 1888.— * P^.tel. Conch. Sam., Ill, 1890, p. 

 180.— '^SowERBY, Conch. Icon., XVII, 1869, pl.xxiii, fig. 89, 483. 



*Margaron (Anodonta) hallenbeckii Lea, Syn., 1870, p. 78. 



* t Anodonta gesnerii Lea, Pr. Ac. N. Sci. Phila., X, 1858, p. 139; * Jl. Ac. N. Sci. 



Phila., IV, 1859, p. 231, pl.xxxi, fig. 109.— ^Obs., VII, 1859, p. 49, pi. xxxi, 

 fig. 109. — *Clessix, Conch. Cab. Ano., 1873, p. 95, pi. xxviii, figs. 1, 2. — 

 *B. H.Wright, Check List, 1888. 



*Anodon gesnerii Sowerby, Conch. Icon., XVII, 1867, pi. vii, fig. 15. 



*Margaron (Anodonta) gesnerii Lea, Syn., 1870, p. 78. 



* Anodonta gessneri P.etel, Conch. Sam., Ill, 1890, p. 179.' 



Georgia. 



t ANODONTA DOLIARIS Lea.^ 



* Anodonta dolearis Lea, Pr. Ac. N. Sci. Phila., VIl, 1863, p. 193. 



* Anodonta doUaris Lea, Jl. Ac. N. Sci. Phila., VI, 1866, p. 24, pl.viii, fig. 23; * Obs., 



XI, 1867, p. 28, pi. VIII, fig. 23.— *Clessin, Conch. Cab. Aao., 1874, p. 130, pi. 

 xLii, figs. 1, 2.—* B. H. Wright, Check List, 1888. 

 * Margaron {Anodonta) doUaris Lea, Syn., 1870, p. 81. 



North Carolina. 



t ANODONTA DARIENSIS Lea. 



* Anodonta dariensis Lea, Pr. Ac. N. Sci. Phila., II, 1858, p. 139; *J1. Ac. N. Sci. 



Phila., IV, 1859, p. 230, pi. xxviii, fig. 99; * Obs., VIL 1859, p. 48, pi. xxviii, 

 fig. 99. — * Clessin, Conch. Cab. Ano., 1874, p. 118, pi. xxxvii, figs. 3, 4. — 

 * B. H.Wright, Check List, 1888.—'^ P^tel, Conch. Sam., Ill, 1890, p. 178. 



*Anodon dariensis Sowerby, Conch. Icon., XVII, 1867, pi. xviii, fig, 70. 



*Margaron {Anodonta) dariensis Lea, Syn., 1870, p. 80. 



Georgia; north Florida. 



Group of Anodonta imbecillis. 



Shell thin, elliptical, sometimes slightly produced near the center of 

 the base, pointed behind, with a slight posterior dorsal wing; area of 

 the beaks generally flattened though often full; beak sculpture con- 

 sisting of several rather delicate, irregular ridges which show a tend- 

 ency to break into nodules ; epidermis bright and smooth, usually marked 



'The type oi A. hallenheckii is a sulcate shell, somewhat constricted at the central 

 base, while that .of A. gesneri is not constricted and is smoother. The former may be 

 slightly diseased, and the museum series of shells appears to absolutely connect the 

 two. 



2 First spelled dolearis by Lea, and afterwards changed by him to doUaris. 



