NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 555 



t * Unio spams Lea, Pr. Ac. N. Sci. Phila., XX, 1868, p. 143; *J1. 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 Eiver, Kentucky; 

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

 ville, jSTortli Carolina. 



tLAMPSILIS MUHLFELDIANUS Lea. i 



* Unio miihlfeldiamis Lea, Tr. Am. Phil. Soc, VI, 1838, p. 41, pi. xii, fig. 36 ; *Obs., 



II, 1838, p. 41, pi. XII, fig. 36.—* Troschel, Arch, fiir Naturg., V, 1839, Pt. 2, p. 

 236.— *Hanley, Test. Moll., 1842, p. 195; * Biv. Shells, 1843, p. 196., pi. xxii, 

 fig. 60. — *Catlow aud Eeeve, Conch. Nom., 1845, p. 61. — ''Conrad, Pr. Ac. 

 N. Sci. Phila., VI, 1853, p. 252.— *Ciienu, 111. Conch., 1858, pi. xvii, figs. 5, 

 5a, bl. — *H. and A. Adams, Gen. Eec. Moll., II, 1857, p. 494. — * Sowerby, 

 Conch. Icon., XVI, 1866, pi. xxxviii, fig. 211.—* B. H. Wright, Check List, 

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



*Marf)arita ( Unio) miihlfeldiamis Lea, Syn., 1836, p. 27; 1838, p. 20. 



*Mar(jaron ( Unio) miihlfeldianus Lea, Syn., 1852, p. 30; 1870, p. 48. 



Cumberland River; Watauga River near Johnson City, Tennessee. 



tLAMPSILIS AMCENUS Lea.3 



* Unio amoenus Lea, Pr. Am. Phil. Soc, I, 1840, p. 286; * Tr. Am. Phil. Soc, VIII, 



1842, p. 200, pi. X, fig. 12; * Obs., 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. xxxiii, figs. 5, 5a, 5&. — * H. 

 and A.Adams, Gen. Eec. Moll., II, 1857, p. 493. — * Sowerby, Conch. Icon., 

 XVI, 1868, pi. Lxxix, fig. 416.— *B. H. Wright, Check List, 1888.— ^Pjstel, 

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

 *Margaron {Unio) amoenus Lea, Syn., 1852, p. 29; 1870, p. 45. 



Holston River, Tennessee. 



tLAMPSILIS TENER Lea.3 



* Unio tener 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 Eeeve, 

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

 *H. and A. Adams, Gen. Eec. Moll., II, 1857, p. 495. — * Chenu, 111. Conch., 

 1858, pi. XXXI, figs. 1, la, 1&.— * B. H. Wright, Check List, 1888.—* PiEXEL, 

 Couch. 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. xxxiii, 

 fig. 8, 3a, 3ft.—* H. and A. Adams, Gen. Eec Moll., II, 1857, p. 494.—* Sowerby, 



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

 ful validity. 



2j)oubtfuny valid. More regularly elliptical than nehulosns, and the dorsal and 

 basal lines are more nearly paraLel. 



'I have only seen the type, a miserably eroded, broken shell, part of which is 

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



