732 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



tUNIO NAVICULOIDES Lea. 



* Unto navicuIoides'LEA, Pr. Ac. N. Sci. Phila.,IX, 1857, p. 170; *J1. 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 ( Unio) naviculoides Lea, Syn., 1870, p. 60. 



Georgia. 



fUNIO SORDIDUS Lea. 



* Unio sordidus Lea, Tr. Am. Phil. Soc, X, 1852, p. 254, pi. xii, fig. 1 ; * Ob8.,V, 1852, 



p. 10. pi. XII, fig. 1.—* Conrad, Pr. Ac. N. Sci. PhiIa.,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 gihhesianus Lea, Tr. Am. Phil. Soc, X, 1852, p. 254, pi. xii, fig. 2 ; * Obs.,V, 



1852, p. 10, pi. XII, fig. 2.—* Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 250.— 



* H. and A. Adams, Gen. Eec. Moll., II, 1857, p. 493.—* B. H. Wright, Check 

 List, 1888. 



* Margaron ( Unio) gilhesianns Lea, Syn., 1852, p. 33; 1870, p. 54. 



Abbeville, South Carolina. 



fUNIO SPADICEUS Lea. 



* Unio spadiceus Lea, Pr. Ac. N. Sci. Phila., 1, 1857, p. 86; *J1. 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) spadiceus Lea, Syn., 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,, 1858, pi. xxx, figs. 6, 6a, 6&.— *B. H. Wright, 

 Check List, 1888. 



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



Southwest Georgia; southeast Alabama. 



tUNIO LAZARUS Lea.i 



*Z7nio 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.— PiETEL, Conch. Sam., Ill, 

 1890, p. 157. 



"^Margaron (Unio) lasarus Lea, Syn., 1852, p. 39; 1870, p. 62. 



Abbeville district, South Carolina. 



(Group of Unio dovmiei.) 



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. 



