7,")!' i'i;<>< I:I-:I>IM;S or THE \ATIO\AL MCSI:I .)/. 



fUNIO NAVICULOIDES Lea. 



* Unio nanntloidesLEA, Pr. Ac. N. Sci. Phila.,IX, I8nl, p.170; Ml. Ac. N. Sci. Phila., 



IV, 1858, p. 94, pi. xx, fig. 74; * Obs., VI, 1858, p. 94, pi. xx, fig. 74. B. H. 

 WRIGHT, Check List, 1888. 

 * Margaron ( I'nio) nariculoides LKA, Syn., 1870, p. 60. 



Georgia. 



fUNIO SORDIDUS Lea. 



* Unio sordidus LEA, Tr. Ain. Phil. Soc., X, 1852, p. 254, pi. xn, fig. 1 ; * Obs., V, 1852, 



p. 10. pi. xn, fig. 1.* CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 1853, p. 257. 



* H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 493.* B. H. WRIGHT, Check 

 List, 1888.* P^TEL, Conch. Sam., Ill, 1890, p. 168. 



* Margaron ( Unio) sordidus LEA, Syn., 1852, p. 33; 1870, p. 54. 



* t Unio r/ibbefiianus LEA, Tr. Am. Phil. Soc., X, 1852, p. 254, pi. xn, fig. 2 ; * Obs., V, 



1852, p. 10, pi. xn, fig. 2.* CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 250. 



* H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 493.* B. H. WRIGHT, Check 

 List, 1888. 



* Margaron (Unio) gibbesianus LEA, Syn., 1852, p. 33; 1870, p. 54. 



Abbeville, South Carolina. 



t UNIO SPADICEUS Lea. 



* Unio spadiceus LEA, Pr. Ac. N. Sci. Phila,, 1, 1857, p. 86; Ml. Ac. N. Sci. Phila., V, 



1862, p. 55, pi. i, fig. 202; * Obs., VIII, 1862, pi. i, fig. 201. *B. H.WRIGHT, 

 Check List, 1888. 

 *Margaron ( Unio) spadiceua LEA, Syu., 1870, p. 48. 



North Carolina. 



fUNIO STRIGOSUS Lea. 



* Unio strigosus LEA, Pr. Am. Phil. Soc., 1, 1840, p. 287; *Tr. Am. Phil. Soc., VIII, 



1843, p. 198, pi. ix, fig. 9; * Obs., Ill, 1842, p. 36 pi. ix, fig. 9.* CONRAD, Pr. 

 Ac. N. Sci. Phila.,VI, 1853, p. 258. *H. and A ADAMS, Gen. Rec. Moll., II., 

 1857. *CHENU, 111. Conch., 1&58, pi. xxx, figs. 6, 6a, 66. *B. H. WRIGHT, 

 Check List, 1888. 



* Margaron ( Unio) strigosus LEA, Syn., 1852, p. 36; 1870, p. 57. 



Southwest Georgia; southeast Alabama. 



tUNIO LAZARUS Lea. 1 



*Unio lazarus LEA, Pr. Am. Phil. Soc., V, 1852, p. 251; *Tr. Am. Phil. Soc., XI, 

 1852, p. 259, pi. xiv, fig. 9 ; * Obs., V, 1852, p. 15, pi. xiv, fig. 9.* CONRAD, Pr. 

 Ac. N. Sci. Phila., VI, 1853, p. 251. *H. and A. ADAMS. Gen. Rec. Moll., II, 

 1857, p. 491.* B. H. WRIGHT, Check List, 1888. P^TEL, Conch. Sam., Ill, 

 1890, p. 157. 



* Margaron ( Unio) lazarus LEA, Syn., 1852, p. 39; 1870, p. 62. 



Abbeville district, South Carolina. 



(Group of Unio doirniei.) 



Shell subtrapezoidal, inflated, solid, truncate and more or less trian- 

 gular behind, sometimes swollen in the postbasal region, with a well- 



'A peculiarly compressed, arcuate form. Some specimens of U. arctatus approach 

 it closely. 



