No.1205. SYNOPSIS OF Tin-: \.ir.ti>/:sSTMPSOX. 733 



developed posterior ridge; beaks full, their sculpture not observed; 

 epidermis smooth and shining in the young shell, becoming duller and 

 roughened when old; hinge moderately strong; pseudocardinals radial, 

 roughened ; laterals heavy, somewhat remote, curved ; there is a more 

 or less developed secondary lateral in the right valve; dorsal scars few, 

 in a row just behind the pseudocardinals and fully exhibited on the 

 inner edge of the shallow beak cavity; nacre dull: muscle scars distinct, 

 smooth. 



Animal with the marsupium occupying the whole of the outer gills; 

 inner gills free from the abdominal sac apart of their length; palpi 

 rather small; mantle line thick on the border. 



fUNIO DOWNIEI Lea. 



* Uniodoicniei LEA, Pr. Ac. Nat. Sci. Phila., II, 1858, p. 166; Jl. Ac. Nat. Sci. Phila,., 

 IV, 1859, p. 210, pi. xxv, fig. 91; Obs., VII, 1859, p. 28, pi. xxv, fig. 91. 

 *SOWERBY, Conch. Icou., XVI, 1868, pi. LXVIII, tig. 350. * 13. H. WRIGHT, 

 Check List, 1888. *P.ETEL, Conch. Sam., Ill, 1890, p. 151.* SIMPSON, Pr. 

 U. S. Nat. Mus., XV, 1892, p. 413, pi. i,v, figs. 1-3; LVI, fig. 5. 



* Margaron (Unio) doioniei LEA, Syn., 1870, p. 41. 



Southern Georgia; north Florida. 



fUNIO GEMINUS Lea. 



* Unio geminus LEA, Pr. Ac. Nat. Sci. Phila., VIII, 1856, p. 262; * Jl. Ac. Nat. Sci. 



PhiLx, 1858, p. 63, pi. X, fig. 45; * Obs., VI, 1858, p. 63, pi. x, fig. 45.* B. H. 

 WRIGHT, Check List, 1888. 



* Margaron ( Unio) yeminus LEA, Syn., 1870, p. 41. 



* t Unio satillaensis LEA, Pr. Ac. Nat. Sci. Phila., II, 1858, p. 166; * Jl. Ac. Nat. Sci. 



Phila., IV, 1859, p. 216, pi. xxvn, fig. 9G; Obs., VII, 1859, p. 34, pl.xxvn, 

 fig. 96.* B. H. WRIGHT, Check List, 1888. 



* Margaron ( Unio) satillaensis LEA, Syn., 1870, p. 41. . 



Georgia. 



fUNIO LECONTIANUS Lea. 



* Margarita ( Unio) lecontianus LEA, Syn., 1836, p. 23; 1838, p. 18. 



*Unio lecontianus LEA, Tr. Am. Phil. Soc., VI, 1838, p. 40, pi. xn, fig. 35; * Obs., 

 II, 1838, fig. 40, pi. xn, fig. 35.* TROSCUEL, Arch. fiirNaturg., V, 1839, Pt. 2, 

 p. 236. "HANI.EY, Test. Moll., 1842, p. 188; *Biv. Shells, 1843, p. 188, pi. 

 xxn, figs. 11, 51. * CATLOW and REEVE, Conch. Norn., 1845, p. 60. * CONRAD, 

 Pr. Ac. Nat. Sci. Phila., VI, 1853, p. 251. "CiiENU, 111. Conch., 1858, pi. 

 xxiv, figs. 6, 6a, 66. *H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 494. 

 *SOWERBY, Conch. Icon., XVI, 1866, pi. XXXIH, fig. 173. * B. H.WRIGHT, 

 Check List, 1888. *!\*:TEL, Conch. Sam., Ill, 1890, p. 157. 



*Margaron ( Unio) lecontianus LEA, Syu., 1852, p. 26; 1870, p. 41. 



*Unio contrarius CONRAD, Pr. Ac. Nat. Sci. Phila., IV, 1849, p. 153; *Anii. and 

 Mag., IV, 1849, p. 301 ; * Jl. Ac. Nat. Sci. Phila., 1850, p. 276, pi. xxxvn, fig. 7; 

 * Pr. Ac. N. Sci. Phila., VI, 1853, p. 247. 



Georgia. 



