GG4 ri;<H'EKiny<is OF THE NATIONAL MUSEUM. 



H'tiio pertenuis LKA, Pr. Ac. X. Sci. Phila., VII, 1863, p. 193; *J1. Ac. N. Sci. 



Phila., VI, 1866, p. 8, pi. n, fig. 4; *Obs., XI, 1867, p. 12, pi. n, fig. 4. * B. 

 H. WRIGHT, Check List, 1888. 

 *Mfir<ir<>H ( I'nio) pertenulu LEA, Syn., 1870, p. 62. 



Streams draining into the Atlantic from New York south to North 

 Carolina; Monroe County, Michigan! 



tSYMPHYNOTA DECORATA Lea. 



I'nio decora! i< LEA, Tr. Am. Phil. Soc., X, 1852, p. 257, pi. xin, fig.6; *Obs., V, 

 1852, p. 13, pi. xin, fig. 6.* CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 248. 

 *H. and A. ADAMS, Gen. Rec. Moll., 11,1857, p. 498. *goWKRBY, Conch. Icon., 

 XVI, 1868, pi. xci, fig. 496. *B. H. WRIGHT, Check List, 1888. *P.KTKI., 

 Couch. Sam., Ill, 1890, p. 150. 



* Margaron (Unio) decoratus LEA, Syn., 1852, p. 19; 1870, p. 29. 



*t Unio insolidw LEA, Pr. Ac. N. Sci. Phila., II, 1872, p. 159; *J1. Ac. N. Sci. 

 Phila., VIII, 1874, p. 40, pi. xin, fig. 37; *Obs., XIII, 1874, p. 44, pi. xm, 

 fig. 37.* B. H. WRIGHT, Check List, 1888. 



Virginia to South Carolina. 



t SYMPHYNOTA NEGLECTA Lea. 



Unio tieglecins LEA, Desc. 12 Uniones, 1843; * Tr. Am. Phil. Soc., IX, 1846, p. 280, 

 pi. XLII, fig. 10; *Obs.,IV, 1848, p. 88, pi. XLII, fig. 10. * CONRAD, Pr. Ac. N. 

 Sci. Phila., VI, 1853, p. 252. *H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 

 493. *KUSTER, Conch. Cab. Unio, 1861, p. 22.">, pi. LXXVI, fig. 4. *B. H. 

 WRIGHT, Check List, 1888.* P.ETEL, Conch. Sam., Ill, 1890, p. 160. 

 Margaron ( I'nio) neglectiia LEA. Syn., 1852, p. 33; 1870, p. 54. 



Northern Alabama. 



t SYMPHYNOTA QUADRATA Lea. 



s Margariiana quadrala LEA, Pr. Ac. N. Sci. Phila., V, 1861, p. 41; * Jl. Ac. N. Sci. 



Phila., II, 1862, p. 210, pi. xxxn, fig. 279; *Obs., IX, 1863, p. 32, pi. xxxn, 



fig. 279. *B. H. WRIGHT, Check List, 1888. *P.ETEL, Conch. Sam., Ill, 



1890, p. 173. 



'* Margaron (Margariiana) quadrata LEA, Syn., 1870, p. 68. 

 Murgariiana (Alaxmodonta) quadrata CI.ESSIN, Couch. Cab. Ano., 1876, p. 273, 



pi. LXXXIII, figs. 5. 6. 



Eastern Tennessee. 



Subgenus LASMIGONA Bafinesque, 1831. 

 (Type, Alasmidonta coxtala Rafinesqne.) 1 



Shell subrhomboid, compressed, corrugated behind; beaks low, their 

 sculpture consisting of several coarse ridges which generally fall into 

 two slight loops, aud often with radiating ridges in front and behind; 

 epidermis shining; laterals partly developed, consisting of blurred ridges 

 which slope diagonally downward and backward on the hinge plate; 

 cavities of the beaks shallow; dorsal scars faint, irregular. 



1 The description of Alasmidonta costata of Rafiuesqne so clearly covers the species 

 described three years later as Alasmodonta rugosa by Barnes that the former name 

 innst be usecf. 



