NO. 1205. SYNOPSIS OF THE NAIADES SIMPSON. 555 



t * Unio sparus LEA, Pr. Ac. N. Sci. Phila., XX, 1868, p. 143; * Jl. Ac. N. Sci. 

 Phila., VI, 1868, p. 306, pi. XLVII, fig. 119; * Obs., XII, p. 66, pi. XLVII, fig. 

 119. *B. H. WRIGHT, Check List, 1888. 



* Margaron ( Unio) spams LEA, Syn., 1870, p. 45. 



Cumberland and Tennessee rivers systems, Green River, Kentucky; 

 Tombigbee and Alabama rivers drainage; Columbus, Georgia; Wolfs- 

 ville, North Carolina. 



tLAMPSILIS MUHLFELDIANUS Lea. 1 



*Unio miililfeldianus LEA, Tr. Am. Phil. Soc., VI, 1838, p. 41, pi. xn, fig. 36 ; *Obs., 

 II, 1838, p. 41, pi. xn, fig. 36.* TROSCHEL, Arch, fiir Naturg., V, 1839, Pt. 2, p. 

 236. *HANLEY, Test. Moll., 1842, p. 195; * Biv. Shells, 1843, p. 196., pi. xxn, 

 fig. 60. *CATLOW and REEVE, Conch. Nom., 1845, p. 61. * CONRAD, Pr. Ac. 

 N. Sci. Phila., VI, 1853, p. 252. *CHENU, 111. Conch., 1858, pi. xvn, figs. 5, 

 5a, 56. *H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 494. * SOWERBY, 

 Conch. Icon., XVI, 1866, pi. xxxvni, fig. 211.* B. H. WRIGHT, Check List, 

 1888. *P/ETEL, Conch. Sam., Ill, 1890, p. 160. 



*Mar(jarita ( Unio) miihlfeldianus LEA, Syn., 1836, p. 27 ; 1838, p. 20. 



11 Margaron ( Unio) miihlfeldianus LEA, Syn., 1852, p. 30; 1870, p. 48. 



Cumberland River; Watauga River near Johnson City, Tennessee. 

 fLAMPSILIS AMCENUS Lea.' 



* Unio amcenua LEA, Pr. Am. Phil. Soc., I, 1840, p. 286; * Tr. Am. Phil. Soc., VIII, 



1842, p. 200, pi. x, fig. 12; * Ohs., Ill, 1842, p. 200, pi. x, fig. 12. * CONRAD, 

 Pr.Ac. N. Sci. Phila., VI, 1853, p. 244. * HANLEY, Biv. Shells, 1856, p. 386, 

 pi. xxiv, fig. 9. * CHENU, 111. Conch., 1858, pi. xxxin, figs. 5, 5a, 56. * H. 

 and A.ADAMS, Gen. Kec. Moll., II, 1857, p. 493. * SOWERBY, Conch. Icon., 

 XVI, 1868, pi. LXXIX, fig. 416. * B. H. WRIGHT, Check List, 1888. * P^TEL, 

 Couch. Sam., Ill, 1890, p. 144. 



* Margaron (Unio) amaenus LEA, Syn., 1852, p. 29; 1870, p. 45. 



Holston River, Tennessee. 



fLAMPSILIS TENER Lea. 3 



* Unio tenet- LEA, Pr. Am. Phil. Soc., 1, 1840, p. 286; * Tr. Am. Phil. Soc., VIII, 1840, 



p. 198, pi. x,,fig. 10; *Obs., Ill, 1842, p. 36, pi. x, fig. 10. *CATLOwand REEVE, 

 Conch. Nom., 1845, p. 64.* CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 258. 

 *H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 495. * CHENU, 111. Conch., 

 1858, pi. xxxi, figs. 1, la, lb. * B. H. WRIGHT, Check List, 1888.* P^TEL, 

 Conch. Sam., Ill, 1890, p. 169. 



Margaron ( Unio) tener LKA, Syn., 1852, p. 28 ; 1870, p. 44. 



t * Unio regularis LEA, Pr. Am. Phil. Soc., II, 1841, p. 82 ; * Tr. Am. Phil. Soc.,VIII, 

 1842, p. 243, pi. xxv, fig. 59; * Obs., Ill, 1842, p. 81, pi. xxv, fig. 59.* CONRAD, 

 Pr. Ac. N. Sci. Phila., VI, 1853, p. 256.' CHENU, 111. Conch., 1858, pi. xxxin, 

 fig. 3, 3a, 3ft.* H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 494.* SOWEHBY , 



1 Lea has only a single specimen in his collection. I consider it a species of doubt- 

 ful validity. 



2 Doubtfully valid. More regularly elliptical than nebulosus, and the dorsal and 

 basal lines are more nearly paraLel. 



:! 1 have only seen the typo, ;i miserably eroded, broken shell, part of which is 

 missing, but I have no doubt that it is the same thing as regularis. 



