550 PROCEEDINGS OF THE NATIONAL MUSE I'M. VOL.XXII. 



"CATLOW and RKKVE, Conch. Norn., 1845, p. 61. *CHENU, 111. Conch., 1858, 

 pi. xvii, figs. 1, la, 16.* H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 494. 

 *KusTER, Conch. Cab. Unio, 1861, p. 220, pi. LXXIV, fig. 3. "P.ETEL, Conch. 

 Sam., Ill, 1890, p. 161. 



* Margarita ( Unio) obscnrus LEA, Syn., 1836, p. 26; 1838, p. 20. 

 *Margaron ( Unio) obscums LKA, Syn., 1852, p. 29; 1870, p. 45. 



* Margarita (Unio) zeiglerianus LEA, Syn., 1836, p. 26; 1838, p. 20. 

 *Uniozeiglerianii8LE\, Tr. Am. Phil. Soc.,VI, 1838, p. 32, pi. x, fig. 27; "Obs.,11, 



1838, p. 32, pi. x, iig. 27. * TROSCHEL, Arch. fiirNaturg., V, 1839, Pt.2, p. 235. 

 *HANLEY, Test. Moll., 1842, p. 193, * Biv. Shells, 1843, p. 193, pi. xxn, fig. 57. 

 *CATLOW and REEVE, Conch. Norn., 1845, p. 65. *H. and A. ADAMS, Gen. 

 Rec. Moll., II, 1857, p. 495. 'CiiENU, 111. Conch., 1858, pi. xxiv, figs. 2, la, 

 26." SOWERBY, Conch. Icon., XVI, 1866, pi. xxxvi, fig. 19. * B. H. WRIGHT, 

 Check List, 1888. P^TEL, Conch. Sam., Ill, 1890, p. 172. 



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



Tennessee and Cumberland river systems; Lower Ohio and its tribu- 

 taries. 



fLAMPSILIS PRATTII Lea. 



*Unio prattii LEA, Pr. Ac. N. Set. Phila., II, 1858, p. 166; *J1. Ac. N. Sci. Phila., 

 IV, 1859, p. 206, pi. xxiv, figs. 88, 88a; *Obs., VII, 1859, p. 24, pi. xxiv, fig. 

 88.^ B. H. WRIGHT, Check List, 1888. 



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



Chattahoochee River, Georgia. 



tLAMPSILIS VAUGHANIANUS Lea. 



* Margarita (Unio) vaughanianus LEA, Syn., 1836, p. 39;-' 1838, p. 25. 



*Unlo raughamanus LEA, Tr. Am. Phil. Soc., VI, 1838, p. 5, pi. in, fig. 5; *Obs., 



II, 1838, p. 5, pi. in, fig. 5.* TROSCHEL, Arch, fiir Naturg., V, 1839, Pt. 2. p. 

 234. -HANLEY, Test. Moll., 1842, p. 208; *Biv. Sheila, 1843, p. 208, pi. xxn, 

 fig. 48. * CATLOW and REEVE, Conch. Norn., 1845, p. 65. * CONRAD, Pr. Ac. 

 N. Sci. Phila., VI, 1853, p. 259.' CHENU, 111. Conch., 1858, pi. xxi, figs, lla, 

 116. * II. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 491. *B. H. WRIGHT, 

 Check List, 1888. *P.ETEL, Conch. Sam., Ill, 1890, p. 171. 



* Margaron (Unio) vaughanianus LEA, Syn. ; 1852, p. 38; 1870, p. 61. 



Near Camden, South Carolina. 



tLAMPSILIS OGEECHEENSIS Conrad. 



* Unio ogeecheenais CONRAD, Ann. and Mag. N. Hist., IV, 1849, p. 300; Jl. Ac. N. Sci. 



Phila., 1, 1850, p. 275, pi. xxxvn, figs.3,4; *Pr. Ac.N. Sci. Phila., VI, 1853, p. 

 254. 



* Unio prevostianus LEA, Tr. Am. Phil. Soc., X, 1852, p. 269, pi. xix, fig. 24 ; *Obs., V, 



1852, p. 25, pi. xix, fig. 24. *CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 255. 

 *H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p.494. *MUSGRAVE, Phot. Conch., 

 1863, pi. li, fig. 10. *B. H. WRIGHT, Check List, 1888. *P.ETEL, Conch. Sam., 



III, 1890, p. 164. 



* Margaron ( Unio) prevoslianus LEA, Syu., 1852, p. 29; 1870, p. 44. 



* Unioproximus LEA, Pr. Am. Phil. Soc., V, 1852, p. 252; *Tr. Am. Phil. Soc., X, 1852, 



1 1 believe that the L. obscurus is only the fully adult form of U. zeiglerianits, which 

 when quite young shows very delicate and beautiful rays. 



- In this case, owing to delay in the publication of the transactions, the name 

 appeared in the Synopsis first, and under the generic name Margarita. 



